近年来,平乡县一些农民形成了一种在小麦越冬期结合浇冻水,追施一定数量的氮肥的管理习惯,即春肥冬用。据我们调查,春肥冬用措施一般对中低产田有一定的增产效果,但用于高产麦田不仅不能促进增产,反而会导致减产。这是为什么呢?大家知道,高产麦田一般地力条件好、底肥足, In recent years, some peasants in Pingxiang County have formed a management habit of combining frozen water and wintering with a certain amount of nitrogen fertilizer during the winter period, that is, spring and winter use. According to our investigation, measures of spring and winter winter generally have a certain yield-increasing effect on middle and low-yielding fields. However, the use of high-yielding wheat fields can not only promote the increase of production but on the contrary it will result in a reduction of production. This is why? As we all know, high-yielding wheat field generally good soil conditions, adequate base fertilizer,