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在化肥使用不当时,肥分损失是很严重的。据国内外的资料表明,作物对氮肥的利用率(以硫酸铵为标准)仅在30～60％,美国是30～50％,苏联41％,英国低于50％,捷克是45～50％,保加利亚30～50％,波兰50～60％,南斯拉夫43～56％,罗马尼亚32～34％,日本50～60％,东南亚各国40～60％,我国27～45％。因此摸清各种环境条件下氮素损失的主要去向,研究提高氮肥利用率的有效措施,在理论上、生产实践上,都有着重要意义。
In the improper use of fertilizers, fertilizer loss is very serious. According to the data both at home and abroad, the utilization rate of nitrogenous fertilizer (with ammonium sulfate as a standard) is only 30-60% in crop, 30-50% in the United States, 41% in the Soviet Union, less than 50% in the UK and 45-50% 30 to 50 percent in Bulgaria, 50 to 60 percent in Poland, 43 to 56 percent in Yugoslavia, 32 to 34 percent in Romania, 50 to 60 percent in Japan, 40 to 60 percent in Southeast Asian countries and 27 to 45 percent in China. So find out the main fate of nitrogen loss under various environmental conditions, and study effective measures to improve the utilization of nitrogen fertilizer, in theory, production practice, are of great significance.