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在风沙半干旱地区农业生产条件下 ,施用化肥仍然是重要的增产措施 ,但是在施用技术上 ,常常照搬非旱区的惯用方法 ,即“口肥 +追肥”的模式 ,而且施肥深度较浅 ,从而造成化肥利用率较低 ,其增产作用不能充分发挥出来 ,同时增加了作业成本。研究氮肥加长效剂一次全量侧深施肥对玉米的增产效果 ,该方法不仅减少了追肥作业环节 ,降低了生产成本 ,而且氮肥深施 ,使得氮肥与深层土壤中的水结合 ,不宜挥发并防止氮肥随着地表径流流失。另外 ,由于作物根系向水、向肥的生长特性 ,利于根系向下发展 ,使作物更耐干旱。加氮肥长效剂又可延缓肥效释放 ,使尿素的肥效期延长到 90～ 1 1 0d。
Under the condition of agricultural production in semi-arid windy areas, the application of chemical fertilizers is still an important measure to increase production. However, in the application technology, the usual method of non-arid areas is often copied, that is, the mode of “top-dressing + top-dressing” As a result, the utilization rate of chemical fertilizers is low, and its stimulation effect can not be brought into full play, at the same time, the operating cost is increased. This study not only reduced the operation steps of dressing, but also reduced the production cost. Moreover, the deep application of nitrogen fertilizer made the combination of nitrogen fertilizer and water in deep soil unfavorable to volatilize and prevent nitrogen fertilizer With the loss of surface runoff. In addition, due to the growth of crop roots to water, fertilizer, conducive to the development of the root system, making the crop more drought-resistant. The addition of long-acting nitrogen fertilizer can delay the release of fertilizer to extend the period of urea fertilizer to 90 ~ 110d.