1973年,我们在嵊县主要稻区进行了水稻(早、晚稻)缺钾症调查,结果表明:缺钾症发生普遍,是实现我县粮食双超《纲要》的一大障碍。如在剡江河谷20个点2,459.1亩晚稻田调查,缺钾症的面积为569亩,占总面积的23.1％,其中重发田为164.5亩,占总面积的6.6％。重发田一般每亩减产200斤以上,中等缺钾田减产100斤左右。缺钾症不但影响水稻产量下降,而且使米质显著变劣。据嵊县农场早稻样品分析结果,缺钾的青米率增加9-18.5％,淀粉含量下降2-3％左右。一、症状早稻:我们观察了迟熟品种“广陆矮4号”孕穗期以后的症状。6月27日孕穗,叶尖1-3厘米处退淡发黄,梢头及其下部边缘褐枯,叶片上出 In 1973, we carried out a survey on the shortage of rice (early and late rice) in the main rice growing areas in Sheng County. The results showed that the occurrence of potassium deficiency is common and is a major obstacle to the implementation of the “outline” of the county’s grain supermarkets. For example, in a survey of a late rice field of 2,459.1 mu in 20 points in Qijiang River valley, the area of ​​potassium deficiency is 569 mu, accounting for 23.1% of the total area, of which 164.5 mu is the retransplant field, accounting for 6.6% of the total area. Redistribution field generally cut more than 200 pounds per mu, medium-deficient K-yield reduction of about 100 pounds. Potassium deficiency not only affects the decline of rice production, but also significantly deteriorates the quality of rice. According to Sheng County farm early rice sample analysis results, green rice rate of potassium deficiency increased 9-18.5%, starch content decreased by about 2-3%. First, the symptoms of early rice: We observed the late maturing variety “Guanglu short 4” bouts after the symptoms. June 27 booting, leaf tip 1-3 cm fade yellow, the first crop and the lower edge of the withered, the leaves on the out