垄沟覆膜栽培下密度和氮肥对冬小麦个体与群体关系的调控效应
롱구복막재배하밀도화담비대동소맥개체여군체관계적조공효응
Effect of planting density and N rate on the relationship of individual winter wheat and its plant population in furrow and ridge film mulching planting system
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