Suggested Topics for Project Papers, Bachelor's Theses, and Master's Theses
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Topic Biological Subsoil Improvement as a Climate Adaptation Measure: Biopore-Forming Potential and Biopore Formation of Various Legume-Grass Mixtures,and Effects on Corn as a Succession Crop on Clay Soils
AdvisorProf. Dr. Miriam Athmann, FÖLm.athmann[at]uni-kassel[dot]de
Duration Any time
Type of Thesis Project thesis and/or BSc thesis
Location Frankenhausen
Methodology/Description
Biological subsoil improvement using perennial taproot plants is a proven adaptation measure to climate change because it creates pathways into the subsoil that benefit subsequent crops as well.
So far, however, this potential has only been demonstrated for loess soils. On drained clay-rich soils, even greater positive effects for subsequent crops can be expected because these soils dry out significantly in the summer, while at the same time, crops penetrate the subsoil only weakly due to its high clay content. Biopores may help the plants extend their roots to reach the soil layers below the drainage pipes and obtain water there even during dry periods
The “Trieschbreite” field of the Hessian State Estate Frankenhausen is characterized by clayey soils with drainage. From 2024 to 2026, three different forage legume mixtures were grown on this field: two with taproot plants that form biopores (alfalfa, chicory) and one with clover-grass mixtures with less efficient root systems.
The mixtures will be plowed under in the winter of 2026–27, followed by corn in 2027.
In the final thesis or project, the following parameters are to be determined individually or in combination:
- Biopore formation potential of the preceding crops alfalfa-grass, chicory-alfalfa-grass, or clover-grass (based on root length densities in various diameter classes)
- Biopore densities in the subsoil (using a spade, vacuum cleaner, photography, and subsequent image analysis)
- Yields of the subsequent crop and, if applicable, root growth of corn.
Taken together, this provides material for two master’s theses; for bachelor’s theses or project papers, individual aspects can be focused on. Root samples for determining biopore formation potential can be processed at any time; biopore densities will be determined in the fall of 2027, and maize parameters during the 2027 growing season.
Project Open
Requirements: Enjoyment of fieldwork, ability to handle physical demands (outdoor work), good fine motor skills and patience for root analysis
Topic
: Various Topics Related to "Social Agriculture"
Advisor: Dr. Thomas van Elsen
Duration: To be agreed upon
Work as — to be agreed upon
Further Information
http://www.soziale-landwirtschaft.de/forschung/abschlussarbeiten/themenvorschlaege
Topic
Root Growth in Mixed Crops of Wheat and Medicinal and Aromatic Plants (Cilantro, Caraway, Fennel)
AdvisorWanda Burzik, wanda.burzik[at]uni-kassel[dot]de
Duration Starting in spring 2025 / Start date flexible
Type of work: Project, BSc, or MSc thesis
Location/Work Site Witzenhausen, Hessian State Estate Frankenhausen
Methodology/Description: Collection of soil cores and analysis using photographs and leached root samples: Quantification of root length density, diameter class distribution, root mass, and root carbon content, differentiated by wheat, cilantro, and caraway (using washed-out samples)
Project TRIO - Transformative Intercropping Systems for One Health
Requirements Willingness to collect and process samples in the field and/or laboratory, a curiosity for research, a great deal of patience, and good fine motor skills for root processing
Topic Root Growth of Annual and Perennial Wheat, Caraway, and Fennel (Perennial)
Advisor Laura Heckmann, laura.heckmann[at]uni-kassel[dot]de
Duration Any time
Type of project: Project, BSc, or MSc thesis
Location Witzenhausen
Methodology/Description Processing of previously collected core samples and analysis of root samples:
- Sample preparation: washing, sorting, and scanning the samples
; Analysis: quantification of root length density, diameter class distribution, root mass, and carbon content, differentiated by wheat and caraway (both annual and perennial) as well as fennel
Project TRIO - Transformative Mixed-Crop Systems for One Health
Requirements Willingness to prepare samples in the lab, a curiosity for research, plenty of patience, and good fine motor skills for root sample preparation
Topic Biopore formation in annual and perennial wheat, caraway, and fennel (perennial)
Advisor Laura Heckmann, laura.heckmann[at]uni-kassel[dot]de
Duration Starting in September 2027
Type of work: Project, BSc, or MSc thesis
Location Hessian State Estate Frankenhausen, Witzenhausen
Methodology/Description Biopore densities in the subsoil (using excavation, vacuuming, photography, and subsequent image analysis)
Project TRIO - Transformative Mixed-Crop Systems for One Health
Requirements Willingness to prepare samples in the lab, a curiosity for research, plenty of patience, and good fine motor skills for root processing
Topic Biopore-forming potential of annual and perennial wheat, caraway, and fennel (perennial)
Advisor Laura Heckmann, laura.heckmann[at]uni-kassel[dot]de
Duration Beginning in November 2026
Type of work: Project, BSc, or MSc thesis
Location Hessian State Estate Frankenhausen, Witzenhausen
Methodology/Description Extraction of earthworms using mustard oil, followed by species identification and biomass determination.
Processing of previously collected core samples and analysis of root samples:
- Processing: washing, sorting, and scanning the
samples - Analysis: quantification of diameter class distribution, differentiated by wheat and caraway (both annual and perennial) as well as fennel
Project TRIO - Transformative Mixed-Crop Systems for One Health
Requirements: Willingness to collect and process samples in the field and laboratory; a curiosity for research; plenty of patience and good fine motor skills for root sample preparation
Topic
: Testing Different Sage Varieties in Field Trials
Advisor: Hanna Blum, hanna.blum[at]uni-kassel[dot]de
Duration: starting in March 2026
Thesis
Location: Walsegarten Farm, Thuringia
Methodology/Description
Sage (Salvia officinalis) is an important medicinal and tea plant. Growers currently have access to only a very limited selection of varieties. Two new cultivars from Switzerland could be of great interest for domestic cultivation and are to be tested in a controlled trial at the Demeter farm in Walsegarten. To evaluate the agronomic traits, an evaluation catalog will be developed to record the variety-specific characteristics.
Project: in cooperation with Ökoplant e.V. and Kultursaat e.V.
Requirements:
Willingness to assist with the trial, take and prepare samples, work reliably, and be able to travel to the Walsegarten farm to collect data in cooperation with the farm manager.
Topic
Walnut Leaves as a Pharmaceutical Raw Material – Studies on Optimizing the Active Ingredient Content
Advisor:Hanna Blum, hanna.blum@uni-kassel.de
Duration: starting in April 2026
Project or thesis
Location: Walnut orchard near Breuna (near Kassel)
Methodology: Walnut trees, with their leaves rich in tannins, provide a valuable raw material for herbal remedies. To date, the leaves have mostly been obtained through wild collection. To learn more about the formation of active compounds depending on the variety, harvest time, and location of the leaves, leaves will be collected from a plantation, dried, and analyzed for valuable active compounds at a pharmaceutical manufacturer.
Prerequisites: Willingness to engage in hands-on work, interest in tree cultivation, agroforestry systems, and medicinal plants, knowledge of statistics
Topic
Evaluation of Different Sowing Dates for Various Winter Poppy Varieties
Duration: starting in February 2026
Project as a thesis (BSc or MSc)
Location: Frankenhausen Estate
Advisors: Sonja Biewer (biewer[at]uni-kassel[dot]de) and Hanna Blum (hanna.blum[at]uni-kassel[dot]de) and
Project: Mohnopoly
Methodology, Description: In a single-factor field trial at the Frankenhausen Research Station, new poppy varieties will be tested against a long-established standard. The study will involve recording agronomic parameters, conducting morphological variety descriptions, and measuring classic plant indices (chlorophyll content, etc.).
Requirements
Interest in measuring agronomic parameters, laboratory analyses, and statistics; willingness to work in the experimental field
Topic
: Sensory Evaluation of Different Types of Poppy Seeds
Advisors: Sonja Biewer (biewer[at]uni-kassel[dot]de) and Hanna Blum, hanna.blum[at]uni-kassel[dot]de
Duration: Starting immediately
Thesis or project
Location: Witzenhausen
Methodology/Description
Poppy seeds and their cold-pressed oil are used as a delicately aromatic food ingredient in bakeries, oil mills, and private households. The internal and external quality of the poppy seeds and the oil will be evaluated using a sensory evaluation scheme.
Topic
Comparison of Pure Cultures and Intercropping of Summer Poppy and Wheat in Terms of Shoot and Root Growth and Quality
Duration: starting in March/April 2026
Thesis
Location: Frankenhausen Estate
Advisor: Sonja Biewer, biewer[at]uni-kassel[dot]de
Project: Mohnopoly
Requirements
Interest in measuring agronomic parameters, laboratory analyses, and statistics
Topic
: Use of Water-Retaining Substrate Additives When Sowing Summer Poppies
Advisor: Hanna Blum, hanna.blum@uni-kassel.de
Duration: starting in March 2026
Project or thesis
Location: Frankenhausen Estate and partner farm
Methodology/Description:
The establishment of fine-seeded crops such as opium poppy depends heavily on ideal soil conditions, technical requirements, and favorable weather conditions. The application of technical additives with water-retaining properties may positively support the seeding process and field emergence. Various materials are to be tested in field cultivation, and their use will be evaluated from both agronomic and economic perspectives.
Project: Mohnopoly
Requirements
Willingness to assist with trial management, sample collection, and sample preparation; reliable work ethic
Topic
Effects of Induced Water Stress on Yield and Quality of Various Summer Poppy Varieties
Advisors: Hanna Blum, hanna.blum[at]uni-kassel[dot]de, and Sonja Biewer, biewer[at]uni-kassel[dot]de
Duration: starting in February 2026
Project or thesis
Location: LLH Kassel, Harleshausen
Methodology/Description
The poppy plant requires sufficient water during certain stages of development to achieve stable yields and good capsule filling. In a pot experiment, water stress will be induced at various stages of poppy development, and the effects on plant development, yield, and seed quality will be measured. The experiment aims to identify the sensitive and yield-relevant phases in poppy development.
Requirements:
Willingness to assist with the experiment at the Kassel-Harleshausen site in cooperation with the LLH, including sample collection and preparation, and a reliable work ethic.
Topic
Market Potential Assessment and Analysis for the Processing of Organically Grown Poppy Seeds
Advisor:Hanna Blum, in cooperation with Prof. Bettina König
Duration: Can be undertaken at any time
Project or thesis
Location: flexible
Description:
Organic poppy seeds are used in baked goods, cooking oils, and snacks. To date, there have been no studies or market surveys on the origin of poppy seeds, their quality, quantities, or raw material procurement channels. This exploratory study aims to address this knowledge gap. Through a survey of bakeries and suppliers (in Hesse), the study will analyze demand and purchasing behavior and identify opportunities and barriers for regional value chains.
Requirements:
Willingness to conduct research and interview stakeholders, as well as to analyze statistical data.
Topic
Testing of a newly developed prototype for the mechanical harvesting of marigold blossoms and, if applicable, other medicinal plant blossoms
Advisors: Hanna Blum, hanna.blum[at]uni-kassel[dot]de, and Lena Voßkuhl, l.vosskuhl[at]uni-kassel[dot]de
Duration: starting in April 2026
Project or thesis
Location: Frankenhausen Estate and field sites
Methodology/Description
In 2025, herb growers and an agricultural machinery company developed a small machine for the mechanical harvesting of flowering medicinal plants. This device is to be tested on the Frankenhausen Estate with marigolds (starting in June 2026); prior to that, harvesting tests will be conducted at field sites using primrose and arnica flowers. The harvesting operations will be accompanied by detailed data collection, a comparison of the machine with manual harvesting, and an assessment of the quality of the harvested material. The results will provide the field sites with valuable performance metrics. A machine-based harvest of flowers that preserves quality can replace manual harvesting and thus make cultivation processes more efficient.
Requirements:
Willingness to assist with the trials at the Domäne Frankenhausen site and on partner farms. Interest in technical developments, enthusiasm for the cultivation of medicinal plants, and field trials. Precision in data collection and reliable collaboration within a project team.
Topic
Use of Digital Image-Based Tools to Determine Flower Coverage in Marigolds
Advisors: Hanna Blum, hanna.blum[at]uni-kassel[dot]de, and Lena Voßkuhl, l.vosskuhl[at]uni-kassel[dot]de
Duration: starting in May 2026
Project or thesis
Location: Frankenhausen Estate
Methodology/Description
To harvest high-quality, nutrient-rich calendula flowers, they must be harvested at the ideal stage of flower opening. No easy decision in practice! To gather information on harvest times relevant to yield and active ingredients in a marigold crop, digital tools will be used to assist in assessing the stage of flowering and the degree of flower coverage. Initial test runs will be conducted in a marigold field in Frankenhausen using a tool developed by the Julius Kühn Institute.
Requirements:
Willingness to assist with the trial at the Domäne Frankenhausen site. Interest in technical and digital developments, enthusiasm for the cultivation of medicinal plants and field trials. Precision in data collection and reliable collaboration within a project team.
Topic
Variation in the Micronutrient Supply of Marigolds to Increase the Content of Value-Adding Compounds
Advisors: Hanna Blum, Lena Voßkuhl,
Duration: Can be started at any time
Project or thesis
Location: Kassel-Harleshausen, Vascular Experiment Station
Description:
Calendula flowers are used in therapeutically effective cosmetics or remedies. They contain valuable active ingredients that must meet specific standards. A laboratory experiment will investigate the effect of a targeted micronutrient supply on these valuable active ingredients.
Requirements:
Willingness to assist with the experiment at the Kassel-Harleshausen site in cooperation with the LLH and the FÖL’s marigold project team, sampling and sample preparation, experimental and evaluation work, statistical data analysis, a reliable work ethic, and an interest in the topics of plant nutrient supply, medicinal plants, and their active ingredients,
Topic
Effects of Induced Water Stress on the Value-Adding Compounds in Marigold
Advisors: Hanna Blum, hanna.blum[at]uni-kassel[dot]de, and Lena Voßkuhl, l.vosskuhl[at]uni-kassel[dot]de
Duration: starting in February 2026
Project or thesis
Location: Frankenhausen Estate, LLH Kassel, Harleshausen
Methodology/Description
In a pot experiment (spring 2026) and a field experiment (summer 2026), water stress will be induced at various stages of marigold development, and the effects on plant development, yield, and quality will be measured. Calendula is used therapeutically due to its medicinal compounds. The thesis may be divided between the pot experiment and the field experiment. In either case, the goal is to learn more about the relationship between water stress and the formation of active compounds.
Requirements:
Willingness to perform fieldwork or work in the protected cultivation facility of the vascular experiment station in Kassel-Harleshausen; interest in data collection and statistical analysis, sample collection and preparation; the ability to work well in a team and a reliable work ethic are desired, as is an interest in the cultivation of medicinal plants.
Topic
: Development of a BBCH scale for describing the plant development stages of caraway or cilantro
Advisor: Christina Mühlenbrock(christina.muehlenbrock@uni-kassel.de)
Duration: starting in March/April 2027
Thesis project
Location: Frankenhausen Estate
Methodology/Description
Documentation of the developmental stages of annual caraway/coriander, visualization of the stages, and preparation of a publication based on the BBCH scales of the Julius Kühn Institute.
Project: TRIO
Requirements
Willingness to work in the experimental field, knowledge of photography, and a talent for drawing, as well as a reliable work ethic
Topic
: Analysis of the essential oils from caraway, cilantro, and/or fennel seeds grown in mixed cropping systems (and at various locations)
Advisors: Christina Mühlenbrock(christina.muehlenbrock@uni-kassel.de)/Fabian Weber
Duration: Starting in the 2026/2027 winter semester
Thesis
Location: Witzenhausen, Nordbahnhofstraße
Methodology/Description
Determination of the essential oil content using steam distillation (according to the European Pharmacopoeia), followed, if necessary, by gas chromatographic analysis of the extracted oils (to identify active compounds)
Project: TRIO
Requirements
Precise work habits and care when handling glassware and laboratory equipment; prior laboratory experience is a plus; reliable work ethic
Topic
: Yield Estimation for Coriander, Caraway, Fennel, and Wheat in Intercropping Systems (Annual and Perennial, Respectively)
Advisors: Christina Mühlenbrock (christina.muehlenbrock@uni-kassel.de)/ Prof. Dr. Miriam Athmann
Duration: October/November 2026
Thesis
Location: Frankenhausen Estate
Methodology/Description:
As part of the TRIO project, the crops grown in the field trial are harvested, dried, threshed, and processed. The resulting yield parameters are then evaluated.
Project: TRIO
Requirements
Willingness to work in the experimental field, careful handling of plant samples, and a precise and reliable work ethic
Determination of Earthworm Density and Species Composition in the Frankenhausen Long-Term Experiment
Topic
Determination of Earthworm Density and Species Composition in the Frankenhausen Long-Term Experiment
Supervisors: Morten Möllermorten.moeller[at]uni-kassel[dot]de
Duration: Spring or Fall
Project, BSc, or MSc thesis
Location: Frankenhausen
Methodology/Description
Since 2017, various livestock-free farming systems have been simulated as part of a long-term experiment on livestock-free organic farming systems at the Frankenhausen estate. These systems differ in their crop rotation designs and fertilization systems. A key focus is on different utilization pathways for legume-grass mixtures, including silage, composting, and cut-and-carry.
Earthworms are important soil organisms and contribute, among other things, to soil aeration and structure development. Farming practices, crop rotation, and organic fertilization can influence their abundance and the composition of the earthworm community. The goal of this work is to record and compare earthworm density and species composition in selected variants of the ÖLAF long-term experiment.
To this end, suitable experimental plots will be sampled, and the earthworms found will be recorded, counted, and identified. The survey will be systematically documented; subsequently, earthworm density and species composition will be analyzed, and differences between crop rotation and fertilization variants will be discussed. Sampling procedures, the depth of investigation, and the survey date will be determined in consultation with the supervisor.
Project: open
Requirements: Enjoyment of fieldwork, appropriate resilience (outdoor work), no aversion to earthworms
Topic
Process-Related Greenhouse Gas Emissions from the Processing of Legume-Grass Mixtures
Advisors:Morten Möller,morten.moeller[at]uni-kassel[dot]de
Duration: Spring 2027
Thesis as a project, BSc, or MSc thesis
Location: Frankenhausen
Methodology/Description
Legume-grass mixtures can be utilized in various ways in livestock-free organic farming systems. In the ÖLAF long-term experiment, for example, silage, composting, and cut-and-carry are considered as utilization pathways. Greenhouse gases can be emitted during the processing and storage of organic biomass. This thesis investigates emission-relevant processes in selected utilization pathways and contributes to their comparative evaluation.
Possible work steps include monitoring ensiling or composting processes, conducting process-related emission measurements using laser-based measurement technology, and recording relevant accompanying parameters such as process duration or material condition. The data will be processed and evaluated with regard to temporal trends and possible differences between the processes under consideration.
Project: open
Requirements: Interest in organic material cycles and greenhouse gas emissions; willingness to perform hands-on work with test materials and to handle sensitive measurement equipment with care.
Topic: Measurement of Greenhouse Gas Emissions in the Field Using the Dynamic Canopy Method
AdvisorMorten Möller, morten.moeller[at]uni-kassel[dot]de
Duration Ongoing
Type of work: Project, BSc, or MSc thesis
Location Frankenhausen
Methodology/Description Soil management and organic fertilization can influence the release of climate-relevant gases. The ÖLAF long-term experiment compares different crop rotations and fertilization strategies in livestock-free organic farming systems. The goal of this project is to measure greenhouse gas emissions under field conditions and to investigate potential differences between selected experimental treatments.
To this end, measurements are conducted in the field using the so-called dynamic hood method. The work includes preparing and carrying out the measurement campaign, documenting accompanying site and management information, and processing and analyzing the emissions data. The central question is whether and how emission profiles differ between the variants under investigation. The measurement periods and scope will be determined in consultation with the advisor.
Project Open
Requirements Enjoyment of regular fieldwork and meticulous measurements; interest in greenhouse gas fluxes and the analysis of large datasets.
Topic Determination of Hydraulic Soil Properties in the ÖLAF Long-Term Experiment
AdvisorMorten Möller, morten.moeller[at]uni-kassel[dot]de
Duration Spring 2027
Type of Thesis Project, BSc, or MSc thesis
Location Frankenhausen
Methodology/Description Soil water storage and conductivity are important factors influencing plant water supply. The aim of this study is to investigate the extent to which the crop rotations and fertilization and land-use patterns of legume-grass mixtures—as compared in the ÖLAF long-term experiment—are reflected in selected hydraulic soil properties.
As part of the thesis, soil samples can be collected from the experimental treatments, and the saturated hydraulic conductivity (kF value), water retention (pF curve), and bulk density can be determined. Depending on the scope of the thesis, individual parameters or their interrelationships may be examined. The results should be compared across the treatments and interpreted in terms of soil structure and soil water balance. The specific sampling and measurement plan will be agreed upon in consultation with the advisor.
Project Open
Prerequisites Interest in soil physics, meticulous sampling, and laboratory work; willingness to perform fieldwork.
Topic
Calibration and Field Use of TDR Probes: Determining the Ideal Irrigation Time for Leeks
Advisor
Duration
Fieldwork will take place from May to July 2025
Work as
Thesis or project
Location
Witzenhausen/Frankenhausen
Methodology/Description
As part of a leek cultivation trial, the factors of irrigation method (overhead irrigation vs. drip irrigation) and mulch use (organic mulch vs. no mulch cover) are varied to measure various agronomic parameters. This includes the influence of transfer mulch on soil temperature, soil moisture, and evapotranspiration.
Permanently installed TDR sensors are used for continuous data collection; these provide real-time information on moisture and temperature and simultaneously serve as the basis for irrigation control. To ensure the precise operation of these sensors, a site-specific calibration is performed. To do this, the bulk density of the soil is first determined through undisturbed sampling using a core sampler. In the next step, several auger samples are collected under varying weather conditions to determine the water content through gravimetric analysis. These data serve as a reference for validating and precisely calibrating the TDR measurement results.
Through this work, students gain in-depth knowledge of soil water balance, irrigation management in vegetable farming, and the practical application of field measurement techniques.
Project
Prerequisites
- Interest in vegetable cultivation and hands-on field/laboratory work
- Willingness to collect samples at the experimental site (group travel by bus from Witzenhausen)
- A meticulous and focused work ethic
Topic
Effect of Mulch Thickness and Irrigation System on Soil Nmin Content and Nitrogen Uptake in Leeks
Advisor
Duration
Fieldwork takes place from June through November; a later start is generally possible
Work as
Thesis or project
Location
Witzenhausen/Frankenhausen
Methodology/Description
As part of a leek cultivation trial, the factors of irrigation method (overhead irrigation vs. drip irrigation) and mulch use (organic mulch vs. no mulch) are varied to quantify various agronomic parameters. This includes the influence of mulch and the irrigation system on nutrient dynamics in plants and soil.
Mulch application influences fundamental soil and plant processes in a variety of ways, particularly through its effects on soil moisture and temperature, soil biology, and nutrient balance. Interactions with different irrigation systems (overhead irrigation—i.e., the mulch is irrigated along with the crop at each irrigation—and drip irrigation beneath the mulch layer, i.e., the mulch remains dry during irrigation), differences in the effects may also arise. This student research project aims to investigate the influence of the mulch layer and the N it contains on the N content in the soil and in the plant by determining N flow pathways. To this end, data on the C/N ratio in the mulch and the plant, as well as on Nmin in the soil, will be collected continuously.
This project will provide in-depth knowledge of nutrient dynamics, plant-soil interactions, and the practical application of analytical methods in the field.
Project
Requirements
- Interest in vegetable cultivation and hands-on field/laboratory work
- Willingness to collect samples at the experimental site (group travel by bus from Witzenhausen)
- A meticulous and focused work ethic
Topic
Investigation of the Effect of an Organic Mulch Layer on Water Retention and Water Productivity
Advisor
Duration
The field experiment will take place in 2024 and 2025. Data from the first year of the experiment are available; raw data from the second year will be available in November 2025.
Thesis or
Thesis or Project
Location
Independent
Methodology/Description
As part of a leek cultivation trial, the factors of irrigation method (overhead irrigation vs. drip irrigation) and mulch use (organic mulch vs. no mulch cover) are varied to quantify various agronomic parameters. This includes the influence of mulch and the irrigation system on water retention and water productivity.
The thick layer of organic material used as mulch (10 cm of straw triticale) influences soil water balance through reduced evaporation and temperature regulation, reduces unproductive water losses, and increases water productivity during yield formation. This study aims to quantify the magnitude of these effects. To this end, potential evapotranspiration is calculated with and without mulch and compared with water productivity. The necessary data on soil moisture and temperature, ambient temperature, wind, global radiation, and relative humidity are available for specific locations and at high resolution.
This work will provide in-depth knowledge in the areas of modeling, soil water balance, and yield formation.
Project
Requirements
- Interest in modeling and a willingness to use R
- A meticulous and focused work style
Topic
Conducting Non-Destructive Leaf Measurements in Leeks and Correlation Analysis with the Experimental Data Set
Advisor
Duration
Fieldwork takes place from June through November; joining the project at a later date is generally possible
Work as
Thesis or project
Location
Witzenhausen/Frankenhausen
Methodology/Description
As part of a leek cultivation trial, the factors of irrigation method (overhead irrigation vs. drip irrigation) and mulch use (organic mulch vs. no mulch) are varied in order to quantify various agronomic parameters. This also includes the interaction between water and nitrogen supply in yield formation.
Through frequent, non-destructive leaf measurements, valuable data can be collected to understand crop development. Specifically, measuring devices are available for the leaf area index (LAI) as a growth parameter, stomatal conductance (gsw) as an indicator of water uptake, and the measurement of chlorophyll and other secondary plant compounds (nitrogen balance index) as an indicator of nitrogen supply. The goal of this work is to assist with the ongoing measurements and to correlate the data obtained with additional data collected in the experiment (e.g., on yield and nitrogen in the plant, soil and mulch, as well as water supply) to explain leek yield formation based on the recorded parameters.
This work will provide in-depth knowledge of water and nutrient dynamics, plant-soil interactions, and the practical application of analytical methods in the field.
Project
Requirements
- Interest in vegetable cultivation and hands-on field/laboratory work
- Willingness to collect samples at the experimental site (group bus trip from Witzenhausen)
- A meticulous and focused work ethic
Topic
Collection of Root Samples Using a Rammed Core Probe & Analysis of Root Length Density in Leeks
Advisor
Duration
Fieldwork takes place from June through November, with laboratory work continuing through the winter; starting at a later date is generally possible
Position as
Thesis or project
Location
Witzenhausen/Frankenhausen
Methodology/Description
As part of a leek cultivation trial, the factors of irrigation method (overhead irrigation vs. drip irrigation) and mulch use (organic mulch vs. no mulch) are varied to quantify various agronomic parameters. This includes the effect on root growth.
The collection of soil cores using a rammed-core probe and the subsequent washing out of the leek roots from the soil samples provides important insights for assessing the influence of mulch and irrigation on root development. This student research position offers the opportunity to gain hands-on experience with field and laboratory methods and to independently analyze the collected data using specialized software.
Through this project, students can acquire in-depth knowledge of root research, including the practical application of analytical methods in the field and in the laboratory.
Project
Requirements
- Interest in vegetable cultivation and hands-on field/laboratory work
- Willingness to collect samples at the experimental site (group bus trip from Witzenhausen)
- A meticulous and focused work ethic
Topic
Recording and Analysis of Carrot Yields and Quality in a Field Trial
Advisor
Duration
Fieldwork takes place from June through November; joining the project at a later date is generally possible
Work as
Thesis or project
Location
Witzenhausen/Frankenhausen
Methodology/Description
As part of a cultivation trial, the effect of tillage following a winter-hardy cover crop on carrot yields and quality is being investigated. To this end, carrots are grown after plowing with a reversible tiller in traditional ridges, shallower and wider ridges, and in beds.
Yields are recorded during a partial harvest and a main harvest. In addition, soil samples are collected, and plant growth is regularly monitored through leaf area index measurements. The advertised position involves assisting with practical fieldwork. Subsequently, the collected data will be compiled, statistically analyzed, and correlated.
Through this work, you can gain in-depth knowledge of the practical application of analytical methods in the field as well as the evaluation of scientific data.
Project
Requirements
- Interest in vegetable cultivation and hands-on field/laboratory work
- Willingness to collect samples at the experimental site (group travel by bus from Witzenhausen)
- A meticulous and focused work ethic
Topic
Collection of Root Samples Using a Rammed-Core Probe & Analysis of Root Length Density in Carrots
Advisor
Duration
Fieldwork takes place from June through November, with laboratory work continuing through the winter; starting at a later date is generally possible
Position as
Thesis or project
Location
Witzenhausen/Frankenhausen
Methodology/Description
As part of a field trial, the effect of tillage following a winter-hardy cover crop on carrot yields and quality will be investigated. To this end, carrots will be grown after plowing with a reverse tiller in traditional ridges, shallower and wider ridges, and in beds. It is expected that the carrots will respond to the treatments with varying root growth.
This hypothesis can be verified by collecting soil cores using a rammed-core probe and subsequently washing the carrot roots out of the soil samples. This student research position offers the opportunity to participate hands-on in field and laboratory methods and to independently analyze the collected data using specialized software.
Through this project, students can acquire in-depth knowledge of root research, including the practical application of analytical methods in the field and in the laboratory.
Project
Requirements
- Interest in vegetable cultivation and hands-on field/laboratory work
- Willingness to collect samples at the experimental site (group bus trip from Witzenhausen)
- A meticulous and focused work ethic
Topic
Independent or collaborative topic development for a project or thesis in organic vegetable farming
Supervision
Duration
Flexible
Work as
Thesis or project
Location
Flexible
Methodology/Description
In addition to the advertised thesis topics, I also offer the opportunity to submit your own topic proposals or to develop them together based on your personal goals and preferences.
These may include further exploration of existing questions or new ones related to the Bio-ClimateProject’s field trials, literature reviews, or independent research projects utilizing the university’s infrastructure.
If you are interested, please contact me by email with a preliminary description of your project.
Requirements
- A meticulous and focused approach to work
Topic
Regional Marketing of Nuts (Walnuts and Hazelnuts)
Duration: starting in November 2026
Project, BSc, or MSc thesis
Location: Witzenhausen, Nordbahnhofstr. / Kassel and Werra-Meißner districts
Advisors: Prof. Dr. Katrin Zander / Dr. Natalia Riemer / Birge Wolf / Thorsten Michaelis
Methodology/Description:
Through the NuPiWi project, a thesis can be completed in close collaboration with industry partners. The goal is to identify opportunities for targeted regional marketing of in-shell nuts and processed nut products. Optionally, the focus could be on a market overview, or a SWOT analysis could be conducted for regional producers, followed by the development of marketing concepts based on those findings.
Project:NuPiWi Project (Promoting Local Production of Nuts and Mushrooms as Sought-After and Healthy Protein Sources Through Knowledge Transfer)
Prerequisites: Basic knowledge of market and marketing research; communication skills
Topic
Tree Monitoring and Tree Pit Maintenance in the ReAgt4Oeko Practical Research Network
Duration: starting in November 2026
Project, BSc, or MSc thesis
Location: Witzenhausen, Nordbahnhofstr. / Frankenhausen Agroforestry System / Partner farms throughout Germany
Supervisors: Birge Wolf / Thorsten Michaelis
Methodology/Description:
The ReAgt4Oeko Practical Research Network (Agroforestry to Increase Resilience in Organic Farming) collaborates with up to 20 partner farms. There is an opportunity to conduct research on various topics, including tree development, the assessment of diseases and pests on leaves, twigs, and harvested nuts, as well as tree pit maintenance. Specific research questions can be explored in greater depth through independent studies. Regarding tree-base care, research can be conducted through interviews on experiential knowledge, challenges, and potential solutions.
Project:ReAgt4Oeko Project (Agroforestry to Increase Resilience in Organic Farming – Practice-Research Network)
Requirements: Interest in working outdoors, physical stamina, a precise and reliable work ethic, basic knowledge of statistics, and communication skills
Topic
Micronutrient Content of Hazelnuts
Duration: starting in Oct. 2026
Project, BSc, or MSc thesis
Location: Witzenhausen, Nordbahnhofstr. / Farms in Hesse
Supervision: Dr. Natalia Riemer / Birge Wolf
Methodology/Description: The Nuss IQ project investigates
the influence of micronutrients on yield and quality in hazelnut cultivation. Various research questions can be addressed within the scope of this project.
Project:Nuss IQ Project (Innovative Strategies for Improving Quality and Yield in Regional Hazelnut Plantations through Foliar Applications of Boron, Zinc, and Silicon)
Requirements: Interest in working outdoors, physical stamina, precise and reliable work habits, basic knowledge of statistics, communication skills
Topic
Product Development for Hazelnuts or Walnuts
Duration: starting in November 2026
Project, BSc, or MSc thesis
Location: Witzenhausen, Nordbahnhofstr.
Advisors: Birge Wolf / Thorsten Michaelis
Methodology/Description:
Which products made from hazelnuts and walnuts are in demand among customers and offer sufficient added value for producers? This project could be carried out as a focus group discussion with consumers, prepared in collaboration with producers as a peer group. Alternatively, a product development workshop for hazelnuts or walnuts could be conducted. Thanks to the existing network of the NuPiWi project, there is good access to commercial farms.
Project:NuPiWi Project (Promoting the local production of nuts and mushrooms as sought-after and healthy sources of protein through knowledge transfer)
Requirements: Interest in innovation and economics; precise and reliable work habits; basic knowledge of statistics and qualitative social research; communication skills
Topic
Seedling Quality and Planting Methods in Agroforestry
Duration: starting in November 2026
Project, BSc, or MSc thesis
Location: Witzenhausen, Nordbahnhofstr. / Northern Hesse / Nationwide
Advisors: Birge Wolf / Thorsten Michaelis
Methodology/Description: Failure
rates are often higher in agroforestry plantings than in conventional plantations. What factors influence establishment success? Type of planting material, planting method, irrigation, exposure, …? For this thesis, a literature review can be conducted, and field studies can be carried out within the ReAgt4Oeko practical research network (Agroforestry to Increase Resilience in Organic Farming).
Project:ReAgt4Oeko Project (Agroforestry to Increase Resilience in Organic Farming – Practice-Research Network)
Requirements: Interest in outdoor work, physical stamina, a precise and reliable work ethic, and/or interest in conducting in-depth literature reviews. Basic knowledge of statistics and communication skills
Topic
Walnut Cultivation Methods in Germany—Survey and Research for an Industry Overview
Duration: starting in November 2026
Thesis project
Location: Witzenhausen, Nordbahnhofstr.
Advisors: Birge Wolf / Thorsten Michaelis
Methodology/Description: The
practical research question can be customized. Suggested focus areas: acreage, varieties, cultivation methods, crop management, marketing. A literature review will serve as the foundation. Depending on the nature (and thus scope) of the thesis, conducting and analyzing qualitative interviews should be an integral part of the work.
Project:NuPiWi Project (Promoting the local production of nuts and mushrooms as sought-after and healthy protein sources through knowledge transfer)
Prerequisites: Interest in the topic; prior knowledge of methodology or subject matter, if applicable
Topic
Monitoring Biodiversity in Walnut Orchards—Comparison and Design of Research Approaches
Duration: starting in November 2026
Thesis project
Location: Witzenhausen, Nordbahnhofstr.
Advisors: Birge Wolf / Thorsten Michaelis in collaboration with other colleagues, depending on the topic
Methodology/Description: Literature
review based on a practice-relevant research question that can be individually tailored. Depending on the nature (and thus scope) of the thesis, conducting and analyzing qualitative interviews may be part of the project.
Project:NuPiWi Project (Promoting the local production of nuts and mushrooms as sought-after and healthy protein sources through knowledge transfer)
Prerequisites: Interest in the topic; prior knowledge of methodology or subject matter, if applicable
Topic
Tracking Working Hours and Other Costs in Agroforestry Systems
Duration: starting in November 2026
Thesis project
Location: Witzenhausen, Nordbahnhofstr.
Advisors: Birge Wolf / Thorsten Michaelis
Methodology/Description: The selection of a
practical research question and a specific agroforestry system must be determined on a case-by-case basis. Experimental work on one or more farms. A literature review of existing data may be included. Depending on the nature (and thus scope) of the work, conducting and analyzing qualitative interviews may be part of the project.
Project:KasselAgroForst Project (Agroforestry Systems for Climate-Sensitive Species in Northern Hesse – Research on the Field of Transformation Based on a Sample Plot in Niedermeiser)
Prerequisites: Interest in the topic; prior knowledge of methodology or subject matter, if applicable. Willingness to visit the agroforestry systems to be studied.
Topic
Payment for Ecosystem Services Provided by Agroforestry Systems
Duration: starting in November 2026
Thesis project
Location: Witzenhausen, Nordbahnhofstr.
Advisors: Birge Wolf / Thorsten Michaelis
Methodology/Description: Literature
review based on a practice-oriented research question that can be individually tailored.
Project:KasselAgroForst Project (Agroforestry systems for climate-sensitive species in Northern Hesse—research into the field of transformation based on a sample site in Niedermeiser)
Prerequisites: Interest in the topic; prior knowledge of methodology or subject matter, if applicable.
Topic
Berry Crops in Agroforestry Systems
Duration: starting in Nov. 2026
Thesis project
Location: Witzenhausen, Nordbahnhofstr.
Advisors: Birge Wolf / Thorsten Michaelis
Methodology/Description: Literature
review based on a practice-oriented research question that can be individually tailored. Depending on the nature (and thus scope) of the thesis, conducting and analyzing qualitative interviews may be part of the project.
Project:KasselAgroForst Project (Agroforestry systems for climate-sensitive species in Northern Hesse—research into the field of transformation based on a sample plot in Niedermeiser)
Prerequisites: Interest in the topic; prior knowledge of methodology or subject matter, if applicable.