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在科学种田水平较低的地区,有些人却认为要增产只要施氮肥就行;而且是施得愈多愈好。其实不然,增产的因素是多方面的,就施肥而言,也大有文章,除注意氮磷钾合理配合和注意施肥方法等外,对如何充分提高化学氮肥的利用率也是当前生产中急待解决的问题。众所周知,施入土壤中的各种化学氮肥,并不是全部被作物吸收,有相当部分却被土壤中亚硝化细菌等微生物的硝化和反硝化作用而引起脱氮和淋溶损失。据科研资料表明,化学氮肥的利用率一般为30～50％,低的仅有20％左右。
In areas where the scientific farming level is relatively low, some people think that it is better to increase production as long as nitrogen fertilizer is applied. In actual fact, the factors that increase production are many, as far as fertilizers are concerned, there are a lot of articles. In addition to pay attention to the rational coordination of NPK and pay attention to fertilization methods, how to fully improve the utilization of chemical nitrogen fertilizer is also the current production of emergency solved problem. It is well-known that various chemical nitrogenous fertilizers applied to the soil are not all absorbed by the crop. A considerable part of them are denitrified and leached by the nitrification and denitrification of microorganisms such as nitrosobacteria in the soil. According to scientific research data shows that the utilization of chemical nitrogen fertilizer is generally 30 to 50%, low only about 20%.