E-Dissertationen: Browsing E-Dissertationen by Author "Vlek, Paul L. G."
Now showing items 1-20 of 21
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An approach to environmental services assessment: functional biodiversity in tropical agroforestry systems (The case of Tomé-Açú, Northern Brazil)
Callo-Concha, Daniel (2009-04-21)Agriculture is one of the main sources of income in developing countries and at the same time one of the major drivers causing environmental conflicts like loss of biodiversity. Agroforestry, which combines agricultural ... -
Assessment of Land Degradation Patterns in Western Kenya: Implications for Restoration and Rehabilitation
Waswa, Boaz Shaban (2012-12-15)Land degradation remains a major threat to the provision of environmental services and the ability of smallholder farmers to meet the growing demand for food. Understanding patterns of land degradation is therefore a central ... -
Comparison of DRIS and critical level approach for evaluating nutrition status of wheat in District Hyderabad, Pakistan
Akhter, Naheed (2012-03-07)Intensive cropping systems, improper use of fertilizers or no fertilizer application, and unreliable and poor quality of irrigation water have led to declining soil fertility in the district of Hyderabad, Pakistan. To date, ... -
The effect of phosphorus amendments on nitrogen fixation and growth of trees on salt-affected croplands in the lower reaches of Amu Darya, Uzbekistan
Djumaeva, Dilfuza (2011-12-07)Afforestation, particularly with the use of N2-fixing trees (NFTs), is an option for ecological restoration of salinized, irrigated croplands in the lower reaches of the Amu Darya River. But current knowledge of enhanced ... -
Effectiveness of soil and water conservation measures for land restoration in the Wello area, northern Ethiopian highlands
Shiene, Shimeles Damene (2012-11-12)Soil-erosion-induced land degradation is a great challenge in the Ethiopian highlands. Consequently, the government has invested in soil and water conservation (SWC) measures, mainly farmland terracing and exclosure of ... -
Gender roles in Agriculture and natural resources management in upper east region, Ghana
Mensah, Michael (2019-11-08)The Upper East region is one of the poorest regions in Ghana with an estimated 90% of the people living in rural areas being peasant farmers. In many instances, farmers use their land unsustainably thus worsening the already ... -
Groundwater potential to supply population demand within the Kompienga dam basin in Burkina Faso
Sandwidi, Wennegouda Jean Pierre (2007)Groundwater recharge is constrained by various factors with rainfall playing a key role. The Kompienga dam basin located in southeastern Burkina Faso displays semi-arid climatic conditions with rainfall occurring five ... -
Implications of renewable energy technologies in the Bangladesh power sector: Long-term planning strategies
Mondal, Md. Alam Hossain (2010-11-24)Bangladesh is facing daunting energy challenges: Security concerns over growing fuel imports, limited domestic energy resources for power generation, and projected demands for electricity that will exceed domestic supply ... -
Improving the nitrogen use efficiency and crop quality in the Khorezm region, Uzbekistan
Kienzler, Kirsten Maren (2010-07-01)In the irrigated agriculture of Central Asia, low nitrogen (N) fertilizer use efficiency in cotton (Gossypium hirsutum L.) and winter wheat (Triticum aestivum L.) decreases yields and farm income. Current N-fertilizer use ... -
Improving the water productivity of integrated crop-livestock systems in the semi-arid tropics of Zimbabwe: an ex-ante analysis using simulation modeling
Masikati, Patricia (2011-07-11)The semi-arid tropics of Zimbabwe are characterised by low levels of economic activity, high incidence of land degradation and a high concentration of the rural poor. Water scarcity is also a principle constraint, and ... -
Integrated desertification assessment in Southern Mongolia
Begzsuren, Shurentuya (2007)The Bulgan soum in southern Mongolia is a part of the Gobi Three Beauty National Park. The territory is composed of arid and semi-arid desert, encompassing 720 000 ha. A desertification threat, which was virtually unknown ... -
Life cycle assessment of carbon and energy balances in Jatropha production systems of Burkina Faso
Baumert, Sophia Emilia (2014-05-12)Modern bioenergy offers several advantages to Burkina Faso, a country that is heavily dependent on imported fossil fuel and greatly relying on traditional biomass use. In this context, Jatropha curcas has been recently ... -
Limiting factors for the establishment of Cordia dodecandra A.DC. and Bixa orellana L. on semi-arid calcareous soils in Yucatan, Mexico
Reuter, Manja-Christina (2006)In Northern Yucatan, huge areas of abandoned sisal plantations, now assigned to the communities, require agroforestry management strategies that take into account the high spatial variability of soil, the lack of surface ... -
Modeling soil erosion and reservoir sedimentation at hillslope and catchment scale in semi-arid Burkina Faso
Schmengler, Almut C. (2011-08-23)Soil erosion is a major factor of land degradation in Sub-Saharan Africa. The loss of nutrient-rich topsoil from hillslopes causes severe agricultural problems for an extremely vulnerable agricultural society that depends ... -
Nitrogen management in irrigated cotton-based systems under conservation agriculture on salt-affected lands of Uzbekistan
Devkota-Wasti, Mina Kumari (2011-11-23)Intensive soil tillage and mismanagement of irrigation water and fertilizers reduce soil organic matter and increase secondary soil salinization. These processes are increasing production costs, reducing soil fertility and ... -
Photogrammetric techniques for the functional assessment of tree and forest resources in Khorezm, Uzbekistan
Tupitsa, Alexander (2010-05-25)A system for inventorying and monitoring forests and tree plantings is indispensable for a proper management of this perennial vegetation. In the mid 1990s, the Government of Uzbekistan (GoU) launched various nationwide ... -
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 ... -
Soil erosion modeling and soil quality evaluation for catchment management strategies in northern Ethiopia
Tesfahunegn, Gebreyesus Brhane (2011-11-02)About 85% of the Ethiopian population is engaged primarily in agriculture. However, changing environmental factors have led to soil quality (SQ) degradation that poses a critical risk for food security. But, despite some ... -
Spatially explicit modeling of sorghum (Sorghum bicolor (L.) Moench) production on complex terrain of a semi-arid region in Ghana using APSIM
Kpongor, Dilys Sefakor (2007)An increasing human population and decreasing fallow periods have resulted in a rapid decline in soil productivity in the semi-arid region of Ghana, which is characterized by low-input subsistence agriculture. Soils are ... -
Spatio-temporal dynamics of bush-fire nutrient losses and atmospheric depositional gains across the northern savanna region of Ghana
Kugbe, Joseph Xorse (2012-10-12)This study estimates the nutrient balance between annual fire-induced nutrient transfers and bulk (wet plus dry) atmospheric nutrient deposition. In the subsistence-based and fertilizer-limited agriculture of northern Ghana ...