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 respiration of rice roots, promote the absorption of nitrogen and protein synthesis, so that rice grains full, high yield and stable production. However, the following four points must be taken into account when applying potassium fertilizer:
1, a reasonable amount. Adhere to the "four more and 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.
2, suitable fertilization. Rice needs the most potassium in the period of high tillering and spikelet differentiation. Potassium fertilizer should be applied once, preferably during the tillering period. For two applications, it should be applied during the tillering period and the spikelet differentiation period.
3, with fertilizer. Potassium application should have the combination of phosphorus and nitrogen in order to fully exert its performance. The ratio of nitrogen, phosphorus and potassium should be 1:0.5:1.2.
4, apply lime. Potassium chloride and potassium sulfate 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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