【摘要】 按供钾能力可将四川主要土壤分为五类。第五类最好,第四类次之,其余三类均缺钾,尤以第一类最显著。速效钾80ppm,缓效钾400ppm可视为土壤缺钾的临界值。杂交水稻吸钾量约为小麦的三倍,水稻施钾的增产率较小麦大。施钾后,稻麦千粒重平均约增2.17g。杂交水稻的钾肥利用率较小麦高3.5倍。更多还原

【Abstract】 There are divided into five major soil types according to their ability of suppling potassium. The 5th class is the best for suppling potassium, secondt to it is the 4 th class. The rest are deficient in kalium particularly the 1st class. Exchangeable potassium 80ppm and non-exchangeable potassium 400ppm may be Consider as critical value. We have found that the quantity of potassium absorption of hybrid rice is approximately twice larger than wheat. Potassium having been applied, output of hybrid rice has increased much larger than wheat. The Weight of 1000 grains in crop applied with potassium is by average 2.17g. heavier than that of the crop non-applied with potassium.更多还原