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我们于1981年进行大豆施用氮、磷、钾、农肥增产效应和氮、磷肥大面积示范试验.结果表明,在中、下等肥力的土壤上,各施肥处理均有不同程度的增产效果.
In 1981, we conducted nitrogen, phosphorus and potassium application effects of soybean and large-scale demonstration experiments of nitrogen and phosphorus fertilizers, and the results showed that different fertilization treatments had different yield increase effects on middle and lower fertility soils.