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钾是植物营养三要素之一,植物需要量大,而有些土壤往往供应不足。过去在生产量不高,农家肥料所占比重较大的情况下,缺钾问题并不突出。但随着化肥生产的发展,化学氮肥与磷肥的用量迅速增加(据广东省生产资料公司不完全统计,1979年销售化肥总量340多万吨中,氮肥占了70％以上,而钾肥还不到1％),再加上水稻单产和复种指数的不断提高,水稻缺钾和钾氮平衡失调引起的水稻生理病害的报道日益增加。
Potassium is one of the three elements of plant nutrition, plant needs large, and some soil is often under-supplied. In the past in the production is not high, a larger proportion of farmers fertilizer, potassium deficiency problem is not prominent. However, with the development of fertilizer production, the amount of chemical nitrogen fertilizer and phosphate fertilizer increased rapidly. (According to the incomplete statistics of Guangdong Production Materials Company, among the more than 3.4 million tons of total fertilizer sold in 1979, nitrogen fertilizer accounted for over 70%, while potassium fertilizer did not To 1%). Combined with the continuous improvement of rice yield and multiple cropping index, the reports of rice physiological diseases caused by imbalance of potassium deficiency and potassium nitrogen balance are increasing.