高产麦田化肥施用不当、氮肥施用过量,是近年来影响小麦持续高产的突出问题。自1976年以来,我院小麦单产一直徘徊在千斤左右,无大的突破,我们曾试图用增大化肥用量的办法来稳定和提高单产,结果适得其反,产量不仅没有多大提高,有的年份反而下降。为此,我们自1978年开始,进行了氮、磷、钾化肥不同量单追和不同比例配合追施对小麦产量形成关系的试验研究。 Improper application of fertilizers in high-yield wheat fields and over-application of nitrogen fertilizers are prominent issues that have had an impact on the sustained high yield of wheat in recent years. Since 1976, the output of wheat in our hospital has been hovering around the threshold without major breakthroughs. We have tried to stabilize and increase yield by increasing the amount of chemical fertilizer. The results are counterproductive. The output has not only increased but not decreased in some years . To this end, since 1978, we conducted a pilot study on the relationship between the yields of nitrogen, phosphorus and potassium fertilizers in different yields and the effects of topdressing on the yield of wheat.