Most highly weathered and leached upland soils in S.E Asia are so deficient in primary nutrients that economic yields of healthy crops cannot be produced, unless nutrients are added to the soil.

• 东南亚大多数高度风化和淋溶的旱地土壤主要养分贫乏，以致除非向土壤施加养分，否则不可能获得健康作物的经济产量。