Your search found 12 records
1 Katyal, J. C.; Singh, B.; Vlek, P. L. G.; Buresh, R. J. 1987. Efficient nitrogen use as affected by user applications and irrigation sequence. Soil Science Society of America Journal, 51(2):366-370.
(Location: IWMI-HQ Call no: PER Record No: H02997)
2 Wassmann, R.; Vlek, P. L. G.. (Eds.) 2004. Tropical agriculture in transition: Opportunities for mitigating greenhouse gas emissions? Dordrecht, Netherlands: Kluwer. 277p.
Agroforestry ; Agricultural research ; Pastoralism ; Rice ; Cropping systems ; Sugarcane ; Crop production ; Cotton ; Maize ; Sorghum ; Wheat ; Cassava ; Fertilizers ; Land use ; Agricultural policy ; Nitrogen ; Soil properties ; Soil management ; Soil moisture ; Soil temperature ; Livestock ; Climate ; Irrigation practices ; Labor ; Governance ; Financing ; Energy ; Deforestation ; Afforestation / Asia / USA / Africa / Brazil / Venezuela / Philippines / Amazonia
(Location: IWMI-HQ Call no: 630 G000 WASS Record No: H033889)
3 Martius, C.; Lamers, J.; Wehrheim, P.; Schoeller-Schletter, A.; Eshchanov, R.; Tupitsa, A.; Khamzina, A.; Akramkhanov, A.; Vlek, P. L. G.. 2004. Developing sustainable land and water management for the Aral Sea Basin through an interdisciplinary approach. In Seng, V.; Craswell, E.; Fukai, S.; Fischer, K. (Eds.), Water in agriculture: Proceedings of a CARDI International Conference “Research on Water in Agricultural Production in Asia for the 21st Century” Phnom Penh, Cambodia, 25-28 November 2003. Canberra, Australia: ACIAR. pp.45-60.
Land management ; Water management ; Ecology ; Research projects ; Natural resources ; Resource management ; Agricultural production / Central Asia / Aral Sea
(Location: IWMI-HQ Call no: 631.7.2 G000 SEN Record No: H034946)
4 Kaizzi, C. K.; Vlek, P. L. G.. 2002. Green manures or fertilisers: The farmer’s dilemma in eastern Uganda. ZEF News, 11:3.
(Location: IWMI-HQ Call no: P 7009 Record No: H035431)
5 Ibrakhimov, M.; Park, S.; Vlek, P. L. G.. 2004. Development of groundwater salinity in a region of the Lower Amu-Darya River, Khorezm, Uzbekistan. Ryan, J.; Vlek, P.; Paroda, R. (Eds.), Agriculture in Central Asia: Research for development. Aleppo, Syria: ICARDA. pp.56-75.
(Location: IWMI-HQ Call no: 630 G570 RYA Record No: H036009)
6 Grote, U.; Craswell, E. T.; Vlek P. L. G.. 2008. Nutrient and virtual water flows in traded agricultural commodities. In Braimoh, A. K.; Vlek, P. L. G. (Eds.). Land use and soil resources. Dordrecht, Netherlands: Springer. pp.121-143.
Food production ; Water requirements ; Environmental degradation ; International trade ; Trade liberalization ; Policy
(Location: IWMI HQ Record No: H041023)
http://www.gwsp.org/downloads/Grote_Craswell_Vlek_2008.pdf
https://vlibrary.iwmi.org/pdf/H041023.pdf
https://vlibrary.iwmi.org/pdf/H041023.pdf
Globalization and increasing population pressure on food demand and land and water resources have stimulated interest in nutrient and virtual water flows at the international level. West Asia/North Africa (WANA), Southeast Asia, and sub-Saharan Africa are net importers not only of nitrogen, phosphorus, and potassium (NPK) but also of virtual water in agricultural commodities. Nevertheless, the widely recognized declines in soil fertility and problems related to water shortage continue to increase, especially in sub-Saharan Africa. The nutrients imported are commonly concentrated in the cities, creating waste disposal problems rather than alleviating deficiencies in rural soils. And also the water shortage problems continue to contribute to intensified desertification processes, which again lead to increased urbanization and thus water shortage problems in cities. Countries with a net loss of NPK and virtual water in agricultural commodities are the major food exporting countries—the USA, Australia, and some Latin American countries. Understanding the manifold factors determining the nutrient and water flows is essential. Only then can solutions be found which ensure a sustainable use of nutrients and water resources. The chapter ends by stressing the need for factoring environmental costs into the debate on nutrient and water management, and advocates more transdisciplinary research on these important problems.
7 Katyal, J. C.; Vlek, P. L. G.. 2000. Desertification: concept, causes and amelioration. Bonn, Germany: Center for Development Research. 65p. (ZEF Discussion Papers on Development Policy 33)
Desertification ; Land degradation ; Soil degradation ; Erosion ; Salinity ; Climate ; Irrigation water ; Soil management ; Land management ; Pastoralism ; Agroforestry ; Water management
(Location: IWMI HQ Call no: e-copy only Record No: H041341)
http://www.zef.de/fileadmin/webfiles/downloads/zef_dp/zef_dp00-33.pdf
https://vlibrary.iwmi.org/pdf/H041341.pdf
https://vlibrary.iwmi.org/pdf/H041341.pdf
8 Mitra, S.; Wassmann, R.; Vlek, P. L. G.. 2003. Global inventory of wetlands and their role in the carbon cycle. Bonn, Germany: Center for Development Research. 44p. (ZEF-Discussion Papers on Development Policy 64)
Wetlands ; Classification ; Surveys ; Climate change ; Carbon Cycle ; Water storage ; Groundwater recharge ; Soil properties ; Carbon ; Databases
(Location: IWMI HQ Call no: e-copy only Record No: H041352)
http://www.zef.de/fileadmin/webfiles/downloads/zef_dp/zef_dp64.pdf
https://vlibrary.iwmi.org/pdf/H041352.pdf
https://vlibrary.iwmi.org/pdf/H041352.pdf
9 Braimoh, A. K.; Vlek, P. L. G.. (Eds.) 2008. Land use and soil resources. London, UK: Springer. 253p.
Land use ; Land management ; Erosion ; Soil degradation ; Soil conservation ; Soil salinity ; Irrigation water ; Agricultural development ; Agricultural trade ; Food production ; Virtual water ; Models ; Waterlogging ; Case studies ; Soil properties ; Heavy metals ; Urbanization / Ethiopia / Africa South of Sahara
(Location: IWMI HQ Call no: 333.73 G000 BRA Record No: H043457)
(0.37 MB)
10 Tischbein, B.; Manschadi, A. M.; Conrad, C.; Hornidge, A.-K.; Bhaduri, A.; Ul Hassan, M.; Lamers, J. P. A.; Awan, Usman Khalid; Vlek, P. L. G.. 2013. Adapting to water scarcity: constraints and opportunities for improving irrigation management in Khorezm, Uzbekistan. Water Science and Technology: Water Supply, 13(2):337-348. [doi: https://doi.org/10.2166/ws.2013.028]
Water management ; Water scarcity ; Surface water ; Groundwater resources ; Irrigation management ; Irrigation scheduling ; River basins ; Rice ; Salinity control ; Soil water ; Soil moisture ; Vegetation ; Institutions / Uzbekistan / Khorezm
(Location: IWMI HQ Call no: e-copy only Record No: H045861)
(0.36 MB)
Like many irrigation schemes in Central Asia, the one in Khorezm faces a two-fold challenge: on the one side, the severe problems inherited from the past need to be remedied and on the other side, the rising supply–demand gap driven by sharpening competition for water and climate change must be dealt with. Located in the lower part of the Amu Darya basin, Khorezm irrigation and drainage scheme is particularly vulnerable to supply–demand gaps. Promising solutions towards adaptation comprise modified strategies of land and water use towards higher efficiency and flexibility in combination with measures to lessen the constraints of the system itself, which was initially designed for the management of a few, large and uniform production units and not for many diverse and small units. Solutions consist of flexible, modeling-based approaches, re-arranging institutional settings and establishing economic incentive systems. Flexible modeling allows an integrated use of surface and groundwater resources avoiding or minimizing the impact of water stress on yield. Institutional settings strengthen the position of water users via improved participation and transparency of processes in Water Consumers Associations (WCAs). Economic measures support sustainable resource use strategies and improve the functioning of WCAs. The findings could be extrapolated to other regions of Central Asia with similar conditions and challenges.
11 Vlek, P. L. G.; Khamzina, A.; Azadi, H.; Bhaduri, A.; Bharati, Luna; Braimoh, A.; Martius, C.; Sunderland, T.; Taheri, F. 2017. Trade-offs in multi-purpose land use under land degradation. Sustainability, 9(12):1-19. [doi: https://doi.org/10.3390/su9122196]
Land degradation ; Land use ; Land conservation ; Multipurpose varieties ; Farmland ; Ecosystem services ; Integrated land management ; Water management ; Urbanization ; Biodiversity ; Farmers ; Stakeholders ; Soil moisture ; Climate change ; Carbon stock assessments ; Crop production
(Location: IWMI HQ Call no: e-copy only Record No: H048411)
(13.9 MB)
Land provides a host of ecosystem services, of which the provisioning services are often considered paramount. As the demand for agricultural products multiplies, other ecosystem services are being degraded or lost entirely. Finding a sustainable trade-off between food production and one or more of other ecosystem services, given the variety of stakeholders, is a matter of optimizing land use in a dynamic and complex socio-ecological system. Land degradation reduces our options to meet both food demands and environmental needs. In order to illustrate this trade-off dilemma, four representative services, carbon sinks, water storage, biodiversity, and space for urbanization, are discussed here based on a review of contemporary literature that cuts across the domain of ecosystem services that are provided by land. Agricultural research will have to expand its focus from the field to the landscape level and in the process examine the cost of production that internalizes environmental costs. In some situations, the public cost of agriculture in marginal environments outweighs the private gains, even with the best technologies in place. Land use and city planners will increasingly have to address the cost of occupying productive agricultural land or the conversion of natural habitats. Landscape designs and urban planning should aim for the preservation of agricultural land and the integrated management of land resources by closing water and nutrient cycles, and by restoring biodiversity.
12 Sikora, R. A.; Terry, E. R.; Vlek, P. L. G.; Chitja, J. (Eds.) 2020. Transforming agriculture in southern Africa: constraints, technologies, policies and processes. Abingdon, Oxon, UK: Routledge. 323p. (Earthscan Food and Agriculture Series) [doi: https://doi.org/10.4324/9780429401701]
Climate-smart agriculture ; Agricultural mechanization ; Transformation ; Constraints ; Digital technology ; Policies ; Strategies ; Intensification ; Diversification ; Crop improvement ; Postharvest control ; Integrated Pest Management ; Renewable energy ; Soil management ; Climate change ; Food production ; Food safety ; Food security ; Land use ; Soil fertility ; Genetic techniques ; Seeds ; Land reform ; Land tenure ; Farming systems ; Cropping systems ; Small scale systems ; Smallholders ; Ecosystem services ; Nutrition ; Livestock production ; Animal health ; Forests ; Urban areas ; Markets ; Rural development ; Entrepreneurship ; Economic development ; Labour ; Gender ; Capacity building ; Farmers ; SADC countries / Africa South of Sahara / Southern Africa / Eswatini / Lesotho / Malawi / Mozambique / Namibia / South Africa / United Republic of Tanzania / Zambia / Zimbabwe
(Location: IWMI HQ Call no: e-copy only Record No: H049917)
(7.33 MB) (7.33 MB)
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