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苜蓿收获后,每公顷土壤中约留下10吨有机物质:红三叶草收获后,约留下7.5吨;燕麦,约留下2.5吨;
After harvest, about 10 tonnes of organic matter is left in the soil per hectare of alfalfa harvest: approximately 7.5 tonnes of red clover leaves after harvest; oats, leaving about 2.5 tonnes;