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液氨是浓度最高的一个氮肥品种,一斤液氨的含氮量相当于二斤尿素、四斤硫铵或五斤碳铵的含氮量,因此施用量则相应减少几倍。这样对减少化肥加工工艺、运输都有好处,同时也便于管道化、自动化和机械化作业。国外农田直接施用液氨发展很快。美国近十一年来,施用量增加三倍,现占总氮肥用量的30—40%。其他如英、法、丹麦、苏联等也正在推广。我国1958、1963、1966年都曾有过零星
Liquid ammonia is the highest concentration of a nitrogen fertilizer varieties, a pound of liquid ammonia nitrogen equivalent to two pounds of urea, four pounds of ammonium sulfate or five pounds of ammonium bicarbonate nitrogen, so the amount is reduced by a few times. This will reduce the fertilizer processing technology, transportation are good, but also facilitate the pipeline, automation and mechanization operations. Foreign direct application of liquid ammonia farmland developed rapidly. In the past eleven years in the United States, the amount of application has tripled and now accounts for 30-40% of the total amount of nitrogen fertilizer. Others such as Britain, France, Denmark, the Soviet Union, etc. are also being promoted. Our country had sporadic in 1958, 1963, 1966