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农牧渔业部组织的南方14省调查表明:南方各省钾肥肥效的发展变化过程,大致可分为三个阶段,五十年代初至六十年代初为钾肥不显著阶段;六十年代中至七十年代初,随着工农业生产的发展,氮、磷化肥施用量的大幅度增加,钾肥呈显效阶段;七十年代中期以来,随着我国化肥生产的迅速发展,氮、磷化肥施用量继续大幅度增长,加上需钾较多的高产良种的推广(如杂优水稻等),而土壤钾素又没有得到足够的补充,使生产上广泛出现缺钾的征象,氮、磷肥效也因之明显下降,钾成了继续提高农业生产的
The survey of 14 provinces in southern China organized by the Ministry of Agriculture, Animal Husbandry and Fishery shows that the process of development and change of fertilizer efficiency in southern provinces can be divided into three stages. From the early 1950s to the early 1960s, there was an insignificant stage for potash fertilizer. In the mid- In the early decade of the decade, with the development of industrial and agricultural production, the application rates of nitrogen and phosphorus fertilizers increased significantly, and potash fertilizer was in a marked stage. Since the mid-1970s, with the rapid development of fertilizer production in our country, the application rates of nitrogen and phosphorus fertilizers continued to be large With the increase of amplitude and the popularization of high-yielding varieties requiring more potassium (such as hybrid rice and so on), the soil potassium has not been sufficiently replenished and the phenomenon of potassium deficiency is widespread in production. Significant decline, potassium has become to continue to improve agricultural production