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随着化肥工业迅速发展,农业生产上大量施用氮磷化肥,以及水稻高产品种的出现,加强病虫防治和增加复种指数等措施,促使稻田单位面积年产量不断提高,从而大量消耗土壤养分,尤其是偏施氮肥的结果,造成土壤有效钾含量逐渐下降,且有机肥用量锐减,致使原来不缺钾的水稻土也表现出缺钾现象,不能满足水稻生育对钾素营养的要求.近年来各地常发生水稻缺钾坐苗以及易罹赤枯病、纹枯病、稻瘟病等情况,亟应探讨解决.鉴于我国可溶性钾盐矿源缺乏,目前生产钾肥受一定限制,因此研究钾肥经济合理用量和适宜使用方法,
With the rapid development of chemical fertilizer industry, a large number of application of nitrogen and phosphorus fertilizers in agricultural production, as well as the emergence of high-yielding rice varieties, pest control and increase of multiple cropping index and other measures to promote annual output per unit area of rice paddy continue to increase, which consumes a large amount of soil nutrients, Is the result of partial application of nitrogen fertilizer, resulting in a gradual decline in soil available potassium content, and a sharp decline in the amount of organic fertilizer, resulting in the original paddy soil is not lack of potassium also showed potassium deficiency, can not meet the requirements of rice growth on potassium nutrition.In recent years, Potassium shortage sit sittage seedlings and rice susceptible to the occurrence of blight, sheath blight, rice blast and other conditions, should be explored urgently.Taking into account the lack of soluble potassium salt source in our country, the current production of potash by a certain limit, so the economy of a reasonable amount of potassium and Suitable for use,