Potassium fertilizer applied to rice can achieve significant yield increase. Potassium sufficient to enhance photosynthesis, promote sugar synthesis and accumulation, increase plant resistance, but also enhance the rice root respiration, and promote the absorption of nitrogen and protein synthesis, so that rice grain full, high yield and stable production. However, the following four points must be taken into account when applying potassium fertilizer:
The amount of reasonable adherence to the "four more than four less" principle. Potassium, which contains less potassium, is applied less, and vice versa; early rice is given more and late rice is less applied; high culm species are more applied and dwarf species are less applied; hybrid rice is applied more frequently and conventional varieties are less applied. Tests show that applying 7.5 to 10 kg of KCl per mu yields the most economic benefits.
Appropriate fertilization of rice requires the highest amount of potassium during the period of high tillering and spikelet differentiation. Potassium fertilizer should be applied at one time and preferably at the tillering stage. For two applications, it should be applied during the tillering stage and the spikelet differentiation stage.
Potassium and potassium should be used in combination with fertilization to fully exert their effects. The ratio of nitrogen, phosphorus and potassium should be 1:0.5:1.2.
Lime Potassium Chloride and Potassium Sulphate are physiological acidic fertilizers, and long-term use will cause acidification of the soil. Lime should be used to neutralize the acidity of the soil to facilitate the growth of rice.
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