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一、概说 在农业生产中氮磷钾被称之为肥料三要素,也就是说,必须充分供给农作物这三种肥料元素,才能保证其生长良好产量丰富。根据我国近二三十年来的地力测定试验研究结果[(1)(2)(3)]指出,我国农业土壤中N.P.K的含量,一般以N最缺乏,P次之,而K素一般不缺。对于N素来说,除了由于空气中的N素参加到生物循环中,可以补充土壤中部分N的缺乏外,同时在我国很早以前,即已注意到补偿土壤中由于收获作物所损失的N素,例如一般农家皆有施用(厂白匕旡)肥、堆肥、绿肥或其他各种农家肥料,以及近二十年来施用硫酸铵的习惯。这些主要都是补充土壤
First, the outline In agricultural production, NPK is called the three elements of fertilizer, that is, we must fully supply the three fertilizer elements of crops in order to ensure their good growth and yield rich. According to the results of the geotechnical test in the past 20 ~ 30 years in China [(1) (2) (3)], the content of NPK in agricultural soils in China is generally the most lacking in N, followed by P, . For N, in addition to N in the air to participate in the biological cycle, can supplement some of the lack of N in the soil at the same time in our country long ago, that has been noted compensation for the loss of crops in the soil due to the loss of N For example, in general, farm households have fertilizer (compost), compost, green manure or other kinds of peasant fertilizer, and the habit of applying ammonium sulfate in the past two decades. These are mainly to replenish the soil