Soil nutrient management for sustained food crop production in upland farming systems in the tropics.
msra（1999）
关键词
soils,organic,weathered soils,phosphorus,cropping systems,inorganic,slash and burn,tropics,nutrient management,nitrogen,farming,multiple cropping,economics,crop residues,crop yield,soil management,soil fertility,soil types,sustainability,mulching,nitrogen fixation
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