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1、前言化肥深施是农业生产的一项施肥新技术。据国内外有关试验研究表明,氮素化肥表面撒施利用率很低,像尿素、氯化铵、硫酸铵等利用率只有30～55%;易于挥发的碳铵和氨水在稻田里施用利用率更低,只有28%左右,且易烧伤禾苗。氮素化肥深施一般比面施可提高利用率60～70%。因此,氮素化肥深施是提高氮素利用率、
1, Foreword Fertilizer deep application of agricultural fertilization is a new technology. According to the domestic and foreign relevant experimental studies, the application rate of nitrogenous fertilizer on the surface is very low. The utilization rate of urea, ammonium chloride and ammonium sulfate is only 30-55%. The utilization rate of volatile ammonium and ammonia in paddy fields Lower, only about 28%, and easy to burn seedlings. Nitrogen fertilizer generally applied than the surface facilities can improve the utilization rate of 60 to 70%. Therefore, the deep application of nitrogen fertilizer is to improve nitrogen utilization,