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施用化肥是提高农作物产量的重要措施之一。据国内外大量统计资料,肥料增加的产量不低于整个增产量的50％。另一方面肥料又是构成农业成本的重要部分。而且大量试验已经确定,随着施肥量的递增,单位肥料的效果逐渐减少,农业成本则随之递增,经济效益因而递降。因此,在确定施肥量时必须全面考虑,不能只看增产数量而不考虑经济效益,更不能不计成本地单纯追求小面积的高产。
Fertilizer application is one of the important measures to increase crop yield. According to a large number of statistics at home and abroad, the output of fertilizer increased not less than 50% of the increase. Fertilizers, on the other hand, constitute an important part of agricultural costs. And a large number of tests have been determined, with the increasing amount of fertilizer, the effect of unit fertilizer gradually reduced, then the cost of agriculture increased, thus reducing the economic benefits. Therefore, in determining the amount of fertilizer must be fully considered, can not just look at the number of production increases without considering the economic benefits, but can not be cost-effective simply to pursue a small area of high yield.