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Dissertation
Combining crop growth models with the Precision Agriculture concept of yield gap analysis to evaluate yield limiting and reducing factors
(2022)
The agricultural sector is considered as one of the main elements of a “functional” society and its welfare for providing means to fulfil the most basic human need for food. In the past, an improved overall welfare of developed countries was directly related to early investment in conventional farming machinery parallel to the industrial development. With the expected future population increase and climate change, farm yield gaps are expected to increase and become more volatile. The awareness of negative externalities ...
Dissertation
Geospatial crop yield modeling for climate change risk transfer, impact assessment, and adaptation strategies
(2023)
Changing climate and weather patterns increase the pressure on food production systems worldwide, significantly impacting livelihoods and economies at various scales. Understanding and adapting/mitigating climate change are essential to cope with the adverse effects of climate change. Biophysical crop modeling offers a unique way to assess the pros and cons of different adaptation strategies because they integrate physical and biological principles to simulate the use and allocation of captured resources mechanistically. ...
Dissertation
Sustainability of traditional cocoa agroforests in Ghana
(2022)
Cocoa (Theobroma cacao L.) is an important agricultural commodity that is important to the economies of many countries in the world. Due to cocoa’s dependence on fertile forests soils, its production is a major cause of deforestation and soil degradation in producing countries. When grown in agroforestry systems it can conserve biodiversity, sequester carbon (C), and maintain soil fertility. There are many cocoa agroforests which are managed without synthetic agrochemicals. Because organic cocoa certification is now ...
Dissertation
Der Einfluss von Befahrung alter Rückegassen mit einem schweren Rückezug auf mechanische, strukturelle und funktionelle Eigenschaften eines mit Fichten bestockten Lössbodens in Abhängigkeit von der Fahrwerkkonfiguration
(2023)
Bei der maschinellen Holzernte mit schweren Holzerntefahrzeugen wird der befahrene Waldboden deformiert und damit potenziell in seiner forstwirtschaftlichen Produktivität eingeschränkt. Mögliche Lösungsansätze für diese unerwünschte Nebenwirkung des Technikeinsatzes sind die Beschränkung der Befahrung des Waldbodens auf permanenten Rückegassen und die Verwendung tragender Bogiebänder. Es besteht jedoch eine Forschungslücke zur Veränderung der physikalischen Eigenschaften von vorverdichtetem Boden bestehender Rückegassen ...
Dissertation
Solar energy integration in agro-processing in the tropics: a case study of large and small-scale cassava processing
(2023)
Agro-processing is key to reducing post-harvest losses. Agro-processing is defined as a set of techno-economic activities applied to all the products originating from the agricultural farm, livestock, aqua cultural sources, and forests for their conservation, handling, and value-addi-tion to make them usable as food, feed, fibre, fuel, or industrial raw materials [12]. Processing can be sophisticated (relying on industrial plants and machinery) or simple (depending on the sun or indigenous small-scale processes). The ...
Dissertation
Plant growth, water quality, carbon and nutrient flows in rural-urban cropping systems of Bengaluru, India
(2024)
The global urban population is expected to reach 5.2 billion by 2030 and by mid-2023 approximately 4.6 billion out of more than 8 billion population were living in towns or cities. This represents approximately 57% of the total global population and is set to reach 60% by 2030. India’s urban population is expected to reach 607 million by 2030 and by mid-2030 40% of the total population will be living in urban areas. Growing urban population has multi-sectoral and dimensional implications in the rural, peri-urban, and ...
Dissertation
A systems approach to understanding post-harvest losses: Insights from a case study of the pineapple value chain in Uganda
(2019-03)
Trotz zahlreicher Anstrengungen gehen weltweit große Mengen an Lebensmitteln nach der Ernte verloren. Insbesondere in Situationen mit begrenztem Zugang zu Ressourcen stellt die Identifizierung geeigneter Maßnahmen eine große Herausforderung dar. Entgegen der klassischen Herangehensweise, die oft technisch orientiert ist, verwendet diese Dissertation einen akteursorientierten und systemischen Ansatz. Dies ermöglicht, die Perspektiven der Akteure zu berücksichtigen und ein kontextabhängiges Verständnis für den Umgang ...
Dissertation
Using crop genetic diversity to improve resilience: Agronomic potential of evolutionary breeding under differing management systems
(2019-03)
Mainly within organic and low-input cropping systems, evolutionary breeding based on the creation of heterogeneous evolving composite cross populations (CCPs) has been gaining attention. The aim of this dissertation is to assess the agronomic potential and yield stability of wheat CCPs in comparison to pure line varieties under differing management systems.
Three winter wheat CCPs were created in the UK in 2001, based on parental varieties that were selected for either their high yield or baking quality. The baking ...
Dissertation
Effects of biochar application on anaerobic digestion processes
(2024)
The use of biochar as an additive in anaerobic digestion (AD) is a potential pathway to enhance AD while promoting biomass-to-biochar value chain within a circular bioeconomy. Biochar, a novel biomaterial, serves for managing residual biomass following the cascading use principle, prioritizing material use over sole energy generation. AD, as a well-established method for biogas production and organic substance management, plays an important role in the global carbon cycle. Therefore, this thesis investigated the ...
Dissertation
Yield performance and weed control efficiency of organically managed silage maize double cropping systems
(2023)
Maize is among the three most important crops worldwide, while its multifunctional nature allows a diversified use. However, the traditional (silage) maize production often has negative side-effects related to the unprotected soil surface — e.g., erosion, weed pressure and related mechanical weed control. There are several alternative management systems to enhance the sustainability of (silage) maize production. However, the means and strength of influence are still unclear in some cases. Therefore, the current thesis ...