氮肥在作物营养中占据首要地位,是作物高产稳产的重要因素之一。我国氮素化学肥料的生产虽有很大发展,但还不能满足农业生产的需要,而氮肥在农田使用中损失,又很大,据统计碳铵表施的利用率仅有28％,硫铵和尿素的利用率一般也不超过45％。可见施于农田的氮肥有一半没有发挥作用。如何进行合理施肥,减少氮肥在土壤中损失,以提高利用率,达到高产,成为急待解决的问题。 Nitrogen fertilizer occupies the first place in crop nutrition, which is one of the important factors of high and stable crop yield. Although the production of nitrogenous chemical fertilizers has been greatly developed in China, it still can not meet the needs of agricultural production. However, the use of nitrogenous fertilizers in farmland has been greatly lost. According to the statistics, the utilization rate of ammonium bicarbonate is only 28% Urea utilization is generally no more than 45%. It can be seen that half of the nitrogen fertilizer applied to farmland did not work. How to carry out reasonable fertilization and reduce the loss of nitrogen fertilizer in the soil in order to improve the utilization rate and achieve high yield has become an urgent problem to be solved.