Potassium chloride is good for rice (agrochemical service square)

Q: In recent years, high-yield cultivation of southern rice, due to the application of nitrogen fertilizer, the general application of potassium fertilizer is low, and some even do not apply potassium, resulting in nitrogen and potassium imbalance, making rice seed setting rate is low, late lodging, sheath blight and brown spot increase problem. Now more farmers realize that it is necessary to apply potassium fertilizer to rice, but I do not know what type of potassium is good.

A farmer in Shaoyang County, Hunan province, operates 10 acres of paddy fields. In recent years, potassium has been applied to the base fertilizer every year. It began to use 5 kg/mu and was later increased to 6-8 kg/mu. The type he used in previous years was potassium chloride, which was changed to potassium sulfate the previous year and last year. Originally he thought that after using potassium sulphate, the amount of application increased, the cost of fertilizers also improved, and the yield and quality of rice would be better. However, after two years of use, the field of rice production was almost the same. Last year, individual small pieces of rice were discovered. Root roots have problems with brown roots. For high-yield rice, it is good to use potassium chloride or potassium sulfate.

A: In recent years, in the high-yield cultivation of southern rice, farmers' friends have paid more and more attention to the balanced application of nitrogen and potassium fertilizers. It is very important to supplement potassium in paddy fields in the South. Continuous application of potash fertilizer can not only increase rice yield and quality, but also reduce the cost of investment. Analyze the reasons, rice is more suitable for the application of chlorinated fertilizer crops. The critical value of chlorine tolerance of rice is higher, even if the soil chlorine concentration reaches this range, the yield and quality of rice will not be affected. Because rice is a very chlorine-resistant crop. The reason why it is strong in chlorine resistance, there are two reasons for nutrient physiology and nutrition and ecology. When the rice plants absorb more chlorine, the chloride ions are mainly distributed in the stems and leaves, while the content of chlorine in the rice is low and can keep the chlorine in rice. The quantity is relatively stable and has little effect on rice yield and quality. As for the more chlorine in rice stalks, the stem segments of rice can be shortened and the lodging resistance of rice can be enhanced. Experimental studies have demonstrated that the degree of fibrosis in the stem and node neocortex of rice straw in the paddy field is higher than that in the application of sulfur fertilizer, which contributes to rice lodging resistance and resistance to pests and diseases. From the perspective of nutrition and ecological conditions, the paddy fields are in a wet state, and the activity of chloride ions is very strong and moves fast. Chlorine has a high probability of moving downwards in the soil profile of rice fields and is not easy to accumulate in the soil. In addition to the absorption of potassium by potassium chloride in potassium chloride, the remaining potassium can be preserved in the soil for later absorption and utilization of rice strains.

However, if a large amount of potassium sulfate or sulfur-containing fertilizer is continuously applied in paddy fields, sulfuric acid is reduced to hydrogen sulfide and attached to the root surface of rice. This is unfavorable to rice root growth and nutrient absorption, and it also reduces the effective absorption of iron by rice. Therefore, it is better than potassium sulfate to choose potassium chloride from rice.

Case study: Rice is a cereal crop that requires more potassium. In southern China, the potassium supply capacity of rice fields is generally not strong, and high-yielding rice is indispensable for supplying potassium fertilizer. Rice is a crop with strong chlorine resistance. Potassium chloride should be used preferentially for rice. It has been proved that potassium chloride is used for a long time in paddy fields in the south, and not only has a stable fertilizer effect but also has a lower production cost than potassium sulfate. (Cao Yiping)

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