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长期以来,人们一直认为在不缺钾土壤上种水稻,无需施用钾肥。经过我们几年的小区和大田试验表明,尽管土壤含钾丰富,但在水稻生长的中后期,由于根系活力的衰退,土壤中有毒物质的积累影响了钾的吸收,植株体内钾的含量仍感不足,从而使钾氮比失调,所以施钾仍有必要。如果在水稻生长的中后期喷施两次钾肥,一般可增产稻谷一成左右。现将试验结果分述如下。
For a long time, people always thought that they could grow rice on potassium-deficient soil without applying potassium fertilizer. After several years of plots and field experiments in our country, despite the fact that the soil is rich in potassium, the accumulation of toxic substances in the soil affects the absorption of potassium in the middle and late stages of rice growth due to the decline of root vitality, and the content of potassium in plants still remains Insufficient, so that potassium-nitrogen imbalance, so potassium is still necessary. If you spray two times in the late rice growth of potash, the general increase about 10% of rice. Now the test results are as follows.