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Shortened fallows have resulted in declining upland rice yields in slash-and-burn upland rice systems in northern Laos. We studied the benefit of planted legume fallows for rice productivity, weeds, and soil nitrogen and phosphorus availability. Four systems were evaluated over a 5-year period: 1-year fallow with native species, 1-year Cajanus cajan fallow, 1-year Leucaena leucocephala fallow, and...
Slash-and-burn rice production systems in northern Laos are undergoing dramatic changes. Increased population pressure and regulations limiting access to land have resulted in shorter fallow periods. Limited information is available on nutrient dynamics in slash-and-burn systems of Southeast Asia in general and particularly on effects of reduced fallow length. Crop and fallow effects on soil parameters...
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