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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
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 ...
Aufsatz
Aqueous Leaching Prior to Dewatering Improves the Quality of Solid Fuels from Grasslands
(2018-04-04)
Renewable energies are necessary to reduce greenhouse gas emissions in energy production, and biomass plays a dominant role in the renewable energy sector. Combustion of biomass constitutes an efficient conversion technique, but is hindered by harmful elements which are frequently contained in residual grassland biomass. We investigated the effect of leaching on solid fuel quality with three independent experiments including the following treatments: (1) with or without leaching, (2) with leaching at various water ...
Aufsatz
Heavy Metals and Polycyclic Aromatic Hydrocarbons in Urban Leaf Litter Designated for Combustion
(2017-03-03)
Vast amounts of leaf litter have to be disposed of by city administrations. This biomass has the potential for energy conversion, but contamination with pollutants can adversely affect this usage. We investigated leaf litter samples from the city of Kassel by analyzing their heavy metal and polycyclic aromatic hydrocarbon (PAH) concentrations. Leaf samples were indeed contaminated with heavy metals and PAHs and contamination was influenced by provenience and collection technique. A simple cleaning system of washing ...
Dissertation
Towards crop communities: exploring wheat diversity, wheat-pea species mixtures and farming practice in a food system context
(2022-06)
This thesis combines experimental work on heterogeneous crop populations (HP) and species mixtures (SM) with a social scientific and participatory approach. Chapter 1 introduces crop communities as a concept to integrate multiple approaches to diversify farming systems. HPs provide intraspecific and SM interspecific diversity in crop communities. A key challenge for the genetic improvement of HPs, especially for root traits is to combine effective selection to improve HPs while maintaining intraspecific diversity. ...
Dissertation
Remote sensing of yield and invasive species in nature conservation grasslands invaded by Lupinus polyphyllus
(2021-07)
Extensiv bewirtschaftetes Grünland und naturnahes Naturschutzgrünland sind wertvolle Bereitsteller von Ökosystemdienstleistungen und könnten eine Schlüsselrolle in zukünftigen Managementstrategien spielen zum Schutz von Arten, die durch den Klimawandel bedroht sind. Jedoch ist extensives Grünland, wie viele andere Ökosysteme, bedroht durch die Ausbreitung invasiver Arten, welche einen großen Einfluss auf den Verlust der Biodiversität haben.
Um den Herausforderungen unserer Zeit zu begegnen, sollten Innovationen in ...
Aufsatz
Socio-economic characterisation of date palm (Phoenix dactylifera L.) growers and date value chains in Pakistan
(Biomed Central, 2016-08-02)
Increasing food production to feed its rapidly growing population is a major policy goal of Pakistan. The production of traditional staples such as rice (Oryza sativa L.) and bread wheat (Triticum aestivum L.) has been intensified in many regions, but not in remote, drought-ridden areas. In these arid, marginal environments dates and their by-products are an option to complement staples given their high nutritive value and storability. To fill knowledge gaps about the role of date palm in the household (HH) income ...
Dissertation
Untersuchungen zur Bedeutung phytotoxischer Sirodesmine und zur induzierten Seneszenz in Interaktionen von Phoma lingam mit Brassica-Arten
(1995)
Ziel dieser Arbeit war es, die Bedeutung phytotoxischer Sirodesmine in Interaktionen von Phoma lingam mit Brassica napus und Brassica juncea zu untersuchen. Ein weiteres Interesse galt dem Einfluß einer induzierten Seneszenz auf die Resistenzeigenschaften.
Zur Isolierung von Sirodesmin PL wurde ein Säulenchromatographieverfahren auf Kieselgelbasis entwickelt. Mit dieser Methode konnten bis zu 100 µg Sirodesmin PL in reiner Form pro Arbeitsgang chromatographiert werden.
Sirodesmin PL wurde in verschiedenen Dosierungen ...
Dissertation
Agrobiodiversity and nutrition in traditional cropping systems
(2018-09-03)
In Uganda many farmer households have diverse agroforestry systems known as homegardens, which have been adapted over generations to supply a year-round harvest of nutritious foods. The work presented in this dissertation sought to identify the factors that influence the agrobiodiversity of these homegardens and to assess the effects of that agrobiodiversity on the health of the households that keep them. Households (n=102) were identified via stratified, random selection across three distinct regional ecological ...