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我国耕地面积占世界的7％,养活着世界21％的人口。合理增加农田施肥量,提高单位面积产量是关系到国计民生的大事。目前,我国化肥不仅产量少(年产量1800余万t),远不能满足农林业发展的需要,而且品种结构不合理,氮磷钾比例失调,少磷缺钾,肥效难以充分发挥,按农业部规划要求,到1995年氮磷钾比例应当调整为1:0.5:0.2,到本世纪末为1:0.5:0.25。
China’s arable land accounts for 7% of the world’s population, feeding 21% of the world’s population. Rationally increasing the amount of fertilizers on farmland and increasing the yield per unit area is a major event that concerns the national economy and the people’s livelihood. At present, not only the output of fertilizers in our country is small (annual output more than 1,800,000 tons), far can not meet the needs of the development of agriculture and forestry. Moreover, the variety structure is irrational, the proportion of N, P, K is imbalanced, According to the planning requirements, the proportion of NPK should be adjusted to 1: 0.5: 0.2 by 1995 and to 1: 0.5: 0.25 by the end of this century.