一、农业化学化的新阶段近代有許多國家大量發展液体氮肥,給農業提供了大量便宜而有效的肥料,使農業化学化進入了一个新階段。氨水是液体氮肥的一种,制造方便,成本低廉,加之对農作物的肥效很高,所以在國外很早就被用來直接施肥,特別是苏联非常重視用氨水施肥,近数年來發展速度很快;波蘭也認为氨水施 First, a new stage of agricultural chemical modernization Many countries in modern times the massive development of liquid nitrogen fertilizer, to provide a large number of cheap and effective fertilizers, the agricultural chemical has entered a new phase. Ammonia is a liquid nitrogen fertilizer, easy to manufacture, low cost, coupled with high fertilizer efficiency of crops, so long been used abroad for direct fertilization, especially the Soviet Union attaches great importance to the use of ammonia fertilizer, the development rate in recent years is very Fast; Poland also think ammonia facilities