E-Dissertationen: Search
Now showing items 541-550 of 751
Einfluss von Bodenhilfsstoffen auf die Wasserhaltekapazität bewässerter Böden
(2018-12-05)
Das Ziel der vorliegenden Dissertation war es, den Einfluss von Bodenhilfsstoffen auf die Wasserhaltekapazität (WHK) von Böden mit unterschiedlichen Bewässerungssystemen zu untersuchen. Um die Wirkung dieser Stoffe in der ...
High precision lysimeters improve our understanding of water cycle and solute transport dynamics
(2018-11-28)
Water is the most precious natural resource on earth. Understanding the movement of water and dissolved substances between the different compartments soil, vegetation, and atmosphere is of crucial importance to resolve ...
Investigating the Potential of UAV-Based Low-Cost Camera Imagery for Measuring Biophysical Variables in Maize
(2018-11-27)
The potential for improved crop productivity is readily investigated in agronomic field experiments. Frequent measurements of biophysical crop variables are necessary to allow for confident statements on crop performance. ...
Exploring ethylenediurea (EDU) as an ozone biomonitoring and screening tool for rice (Oryza sativa L.)
(2018-12-10)
Tropospheric ozone concentrations are rapidly rising in many developing parts of the world, thereby threatening food security. Therefore, breeding for adapting rice varieties is essential in Asia, especially in the Indian ...
Post-harvest losses in Sub-Saharan Africa: measurement concepts and economic assessment of reduction strategies
(2018-11-27)
Post-harvest loss (PHL) is a major source of inefficiency in the agricultural value chain in Sub-Saharan Africa (SSA). It wastes productive resources, reduces economic agents' income, and aggravates the problem of insufficient ...
Occasional direct-seeding of grain legumes in Organic Agriculture in Germany and Brazil: fertilisation with P and S & weed control with natural herbicides
(2018-02-13)
The aim of this work was to test strategies, which improve nutrient supply and weed control in occasional direct-seeded (DS) grain legumes in Organic Agriculture. The effect of intra-row fertilisation of rock phosphate ......
Sustainability of organic and non-organic smallholder farms in Kenya
(2018-06-29)
Smallholder farms play a vital role in the quest for sustainable development, especially in sub- Saharan Africa (SSA) where livelihoods are still heavily reliant on agriculture. Current environmental and socioeconomic ...
Assessing land-use dynamics in a Ghanaian cocoa landscape
(2018-07-11)
Ghana is one of the two West African nations that produce 60% of the World's annual 4 million tonnes cocoa. The Ghanaian cocoa industry is valued at US$ 2 billion and offers direct jobs to 800,000 farming families. Despite ...
The effect of air exposure before and after ensiling on maize silage quality and dietary choice by goats
(2018-07-11)
The overall aim of the thesis was to determine the effect of air exposure before and after ensiling on quality of whole-crop maize silage and to determine the influence of the resulting changes on dietary choice by goats. ...
Action-based and outcome-based payments for environmental services: An experimental auction for tree planting contracts in Kenya
(2018-06-25)
The dissertation represents a first randomized field experiment that compares action-based and outcome-based payments for environmental services (PES). The main aim of the study was to investigate the effect of the ...