Scientific application of potash fertilizer

Potassium is one of the three essential nutrients for the growth and development of crops. In order to improve the application effect of potash fertilizer, we should not only pay attention to the combined application of potash fertilizer, nitrogen and phosphorus fertilizer, but also pay special attention to the following principles: 1. Should be applied to potassium-loving crops. The characteristics of potassium requirement are different with different types of crops. Legume crops are the most sensitive to potassium, and the yield is significantly increased after application. Potato crops with carbohydrates and sugar beets, watermelons and fruit trees with more sugar, cotton and tobacco in cash crops also need more potassium. Among the gramineous crops, corn is the most sensitive to potassium, while applying potassium fertilizer to rice and wheat, the yield is relatively less. Therefore, when applying potash fertilizer, farmers should give priority to applying potash fertilizer to potassium-loving crops according to the characteristics of crop potassium demand, such as increasing the application of potash fertilizer to corn can make the grain full, and applying potash fertilizer to cotton can prevent premature senescence. two。 Should be applied to potassium-deficient soil. Soil potassium content and potassium supply capacity determine the fertilizer efficiency of potassium fertilizer, the soil with low potassium supply is easy to lack potassium, and the effect of applying potassium fertilizer is better in sandy soil with coarse soil texture. Therefore, potassium fertilizer should be given priority to be applied to this soil to meet the potassium demand of crop growth and development, so as to obtain better economic benefits. The application rate of potash fertilizer should also be increased for root tuber or tuber crops. 3. It should be applied to high-yielding fields. After the increase of crop yield, each harvest will take away a large amount of potassium from the soil, resulting in soil potassium deficiency. If it is not replenished in time, it will obviously affect the yield and become the restricting factor of crop high yield to a certain extent. Therefore, potash fertilizer should be mainly applied to high-yield fields in order to give full play to its role in increasing production. 4. It should be applied reasonably according to the characteristics of potash fertilizer. Potash fertilizer has little mobility in the soil, so it is suitable to be used as base fertilizer and applied in the soil layer with dense roots. For sandy soil, half can be used as base fertilizer and half as topdressing fertilizer. Potash fertilizer should be applied as soon as possible, but the fertilizer effect is poor if it is applied too late. Because the amount of potassium required by crops is large in the early stage and less in the later stage, which mainly depends on the redistribution of nutrients in organs, the effect of potassium application in the later stage is not as good as that in the early stage. 5. It should be applied in combination with nitrogen and phosphorus according to environmental conditions and the level of potassium application. When crops encounter adverse growth conditions such as low temperature, drought and serious diseases and insect pests, if potassium fertilizer is applied in time, the stress resistance of crops can be improved and a better harvest can be obtained.