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dc:title "HTML Summary of #4114 \n\nImproved rainfed farming for semiarid tropics-implications for soil and water conservation\n\n";
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bibo:abstract "Alfisols and Vertisols are major soil orders found in the semiarid\r\ntropics. In most semiarid regions, the average annual rainfall would seem\r\nto be enough to produce one or two crops per year; however, rainfall patterns\r\nare erratic with frequent dry periods within the rainy season. The\r\nuncertainties have kept farmers from investing substantially in the development\r\nof the land resource base and in the use of high yielding varieties,\r\nfertilizers, and other inputs (4). Increased population has resulted in a\r\nneed for fundamental changes in production systems. Shifting cultivation\r\nis being replaced by permanent agriculture, and farmers' attempts to further\r\nincrease production have caused an extension of agriculture to marginal\r\nlands subject to frequent crop failure, primarily because of inadequate\r\nmoisture. Intensified land use under existing systems may become\r\nself-defeating because it results in increased runoff and soil erosion, reduced\r\ngroundwater recharge and downstream flooding of agricultural\r\nlands. As a result, the land resource base is shrinking and its productive\r\ncapacity is diminishing. Thus, a scheme of resource management combining\r\neffective conservation and utilization of soil and water with crop production\r\nsystems that maintain productivity and assure dependable harvest\r\nis urgently required (5)."^^xsd:string;
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