First, the amount of potash should be appropriate. It is advisable to apply chemical potassium fertilizer 5 to 12 kg per acre, and to increase rice production in this quantity range, with the best economic benefits.

The second is to apply the appropriate time. According to the characteristics that young rice tissue needs potassium from the youngest to the booting stage, and that potassium has the ability to transfer in the body and can be reused, if 5 kg of potassium chloride is applied per acre, the topdressing stage should be applied at the beginning of tillering. The effect is best; if 10 kg of potassium chloride is used per acre late rice, it is best to apply it twice: the first time before the transplanting, Pingtian Shi, applying 6-7 kg per acre, and the second time using 3-4 kg per acre. Late rice delivery. With the return of straw, the amount of potash fertilizer applied to late rice can be reduced accordingly.

The third is to give priority to potassium in hybrid late rice. Due to the thick stalks, deep rooted leaves, and large amount of growth, the hybrid late rice needs more nutrients. Therefore, the demand for potassium is also high. Where chemical potassium fertilizer is in short supply, the demand for hybrid late rice should be met first, and the application rate should also be higher than that of japonica rice and other conventional late rice. In the late growth period of hybrid rice, spraying 0.2 to 0.3% of potassium dihydrogen phosphate one or two times at the root should be sprayed, and 45 to 50 kilograms of fertilizer should be sprayed per acre, and the spraying effect would be better in the evening.

The fourth is the choice of potash: the use of potash fertilizer for late rice, the best choice of potassium chloride in poorly drained paddy soil, without potassium sulfate, if the application of potassium sulfate, in poorly discharged strong reducing soil, sulfate ions will be reduced to sulfide The substance poisons the late rice root system. The application of potash fertilizer should pay attention to the application of organic fertilizer in order to reduce the loss of potash fertilizer and increase the aftereffect of potash fertilizer, which is more conducive to increase the yield of late rice.

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