水稻一般都需要速效肥料作追肥,过去大都使用人粪尿、硫酸铵或油饼等,但这一类肥料的数量很有限,远远不能满足水稻大面积追肥的需要,这是在水稻生产上一个很突出的问题。中共大悟县委及农业局在1955年总结了当地少数群众利用山青直接作水稻追肥的经验,1956年即多点进行试验,57年开始大面积推广,获得了显著的增产效果。如57年全县开展消灭三类苗运动时,在38,750亩田里,施 Rice generally requires quick-fertilizers for top-dressing. In the past, human excrement, ammonium sulfate or oil cakes were mostly used. However, the quantity of this type of fertilizer is very limited and can not meet the needs of large-area paddy top- Very prominent problem. In 1955, the CPC Dawu County Committee and the Bureau of Agriculture summed up the experiences of the local minority using the mountain green to directly make rice topdressing. In 1956, they carried out more experiments and started large-scale popularization in 57 years and achieved remarkable yield-increasing effect. For example, in 57 years, the county carried out campaigns to eliminate three kinds of seedlings and applied them to 38,750 mu of land