Nitrogen ( N ), phosphorus ( P ), and potassium ( K ) are the three major nutrients necessary for plant growth. The lack of any one will affect the normal growth and yield of crops. With the popularization of soil testing and formula fertilization technology, most farmers have a certain understanding of the application of potash fertilizer in crops, but should also achieve “five attentions” in specific application.

 

Pay attention to the response of crops to potassium fertilizer. The potassium fertilizers currently used in production mainly include KCl and K2SO4 . KCl contains K2O 50%~60% and the price is cheap. It is suitable for general field crops and cucumber and bitter gourd plants with sulfur sensitivity; K2SO4 contains K2O48%~ 52% , higher price, suitable for chlorine sensitive crops such as watermelon, sweet potato, potato, grape, tobacco, peach tree and pear tree. Potassium-sensitive crops have a significant potassium application effect, and legumes and corn are sensitive to potassium.

 

Note that potassium fertilizer should be applied early in the application of potassium, generally based on basic application. The soil with poor fertilizer can be applied in appropriate amounts to reduce the loss of potassium. For example, the absorption of potassium by corn is mainly in the seedling stage, and it is basically no longer absorbed at the flowering and heading stage.

 

Pay attention to the scientific application of potash fertilizer, which can increase crop yield, improve the quality of agricultural products, and enhance the ability of crops to resist lodging, disease and drought. However, excessive application of potash fertilizer not only wastes, but also causes physiological diseases such as yellow leaves and dried heartburn, and even Affects yield and quality. Different crops require different amounts of potassium, watermelons and fruit trees need more potassium; corn and cotton require potassium; peanuts, soybeans and other legumes, sweet potatoes, potatoes, etc. are sensitive to potassium but not much, wheat and millet need Potassium is also less.

 

Note that the combination with N , P , and organic fertilizers means that the normal metabolism of crops requires that the various nutrients remain relatively balanced. Second, there is an interaction between potash and many nutrients, and the effect of K and N is most obvious. "Complementary" effect; Third, organic fertilizer can absorb potassium ions and prevent the loss of potassium.

 

Pay attention to the application method and application depth. At present, the utilization rate of potassium fertilizer in China is generally 34%-46% . In order to improve the utilization rate of potassium fertilizer, potassium fertilizer should be applied deep and concentrated. Because potassium is easily fixed in the topsoil, potassium should be applied to the soil layer with a large distribution of roots to facilitate root absorption; generally, methods such as strip application and acupoint application are used.