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我省各地经验,在玉米、高粱、谷子、甜菜等作物施尿素,施肥方法多采追肥,表现了一定的增产效果。为了进一步提高尿素的利用率,充分发挥其增产作用,我们从1975年开始研究了尿素深追肥的增产效果及其原因。1973～1979年省内许多生产单位和科研单位又在推广使用中积累了大量经验。现将上述研究结果和使用经验,简介如下。
Throughout our province experience, in the corn, sorghum, millet, sugar beet and other crops with urea, fertilizers and more top dressing, showing a certain increase in yield. In order to further improve the utilization of urea, give full play to its role in increasing production, we started from 1975 to study the effect of urea deep top dressing yield and its causes. From 1973 to 1979, many production units and research institutes in the province also accumulated a great deal of experience in promoting their use. Now the above findings and experience, are as follows.