E-Dissertationen: Auflistung E-Dissertationen nach Autor "Ewert, Frank A."
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Bioporengenese durch homo- und allorhize Kulturpflanzen: Einfluss auf das Wurzelwachstum der Nachfrüchte
Perkons, Ute Katharina (2018-11-08)Im Organischen Landbau ist ein tiefreichendes Wurzelsystem, das die Aufnahme von Wasser und Nährstoffen aus tiefen Bodenschichten ermöglicht, ein wichtiges Element zur Stabilisierung des Ertrags. Bioporen, durch Pflanzenwurzeln ... -
Effects of heat and drought stress on cereal crops across spatial scales
Eyshi Rezaei, Ehsan (2017-02-10)The production of cereal crops is increasingly influenced by heat and drought stress. Despite the typical small-scale sub-regional variability of these stresses, impacts on yields are also of concern at larger regional to ... -
Experimental analysis and modelling of the rainfed rice cropping systems in West Africa
Worou, Omonlola Nadine (2012-07-18)There is a need to improve rice productivity to meet the increasing demand for rice in West Africa since it is acknowledged that existing rainfed rice cultivation practices deal with irregularities of climate like drought ... -
The impact of soil water distribution on root development and root water uptake of winter wheat
Cai, Gaochao (2018-04-10)Root water uptake (RWU) is a key process in the root zone that determines water movement from the soil into roots and transport to the atmosphere via plant leaves. Different RWU models were developed with different assumptions ... -
Management Effects on Yam Production in Benin Republic: Experimental Analysis and Modeling
Srivastava, Amit Kumar (2010-02-22)Declining productivity in the Republic of Benin (West Africa) highlighted the need for a study to determine both the effect of fertilization on yam (Dioscorea spp.) yield and biomass production, as well as the best agronomic ... -
Re-Solution - understanding the uncertainty in regional applications of crop models
Angulo Villacís, Carlos Lenín (2015-02-27)Uncertainties emerging from the scale change and data constraints when analyzing and further utilizing the results of regional crop model applications are largely unclear. The present thesis offers a systematic analysis ... -
Resource utilization and sustainability of conservation-based rice-wheat cropping systems in Central Asia
Devkota, Krishna Prasad (2011-08-26)Excessive and inefficient water use, intensive soil tillage and decreasing soil fertility have caused land degradation and desertification, which are threatening the sustainability of rice-wheat systems in the irrigated ... -
Rice yield gaps in West Africa
Niang, Abibou (2019-05-15)Rice is a staple food for many countries in Africa but the production has never satisfied the demand which largely depends on imports. Therefore, more efforts are needed for raising yield in order to reduce the gap between ... -
Soil and water conservation technologies in the West African Sudan Savanna: Cropping system options to address variability of crop yield and impacts of climate change
Danso, Isaac (2015-12-03)In the Sudan Savanna region of West Africa, smallholder agricultural production is almost entirely rain-fed. Some of the major constraints to crop production are low soil fertility and high intra- and inter-annual rainfall ...