化肥虽有一定的增产作用,但是长期施用化肥,破坏土壤结构,造成土壤板结,肥力下降,而且提高生产成本,甚至增产不增收。必须寻找一条提高土壤肥力、种地养地的新途径。一九七七年,我们学习外地经验,结合我队实际情况,在试验田里,搞了一亩玉米套种草木樨,当年就地压青,当年肥田的试验,收到了良好的效果。没有追化肥,亩产玉米九百 Fertilizer although a certain increase in production, but the long-term use of chemical fertilizers, destruction of soil structure, resulting in soil compaction, fertility decline, but also increase production costs, and even increase does not increase income. We must find a new way to improve soil fertility and cultivate land. In 1977, we learned from foreign experience and combined with the actual situation of our team. In the experimental field, we undertook an acre of maize intercropping grass and mulberry trees. Did not pursue fertilizer, corn 900 per mu