资源 标记: Micronutrients

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  1. FM 1987 ILEIA Newsletter Vol 3 #1

    1987-05-19 Integrated nutrient supply Improved fallow Nitrogen transfer from legumes Cover crops on acid soils Sunnhemp Rock phosphate Micro-nutrient drain Soil conservation and shifting cultivators Cycles of poverty
    Cover Crops Poverty Soil Conservation Fallow Sunn Hemp Legumes Phosphorus Micronutrients Soil Acidity Nitrogen