Five points should be paid attention to in the efficient and scientific application of potash fertilizer

Nitrogen (N), phosphorus (P) and potassium (K) are the three essential nutrients for plant growth, and the lack of any one of them will affect the normal growth, development 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 to crops, but they should also pay "five attention" to the specific application. Pay attention to the response of crops to potash fertilizer. The potash fertilizers currently used in production are mainly KCl, K2SO4MagneKCl containing K2O50% Mel 60% and cheap, suitable for general field crops and cucumber, balsam pear and other crops sensitive to sulfur; K2SO4 contains K2O48% Mel 52%, the price is high, suitable for watermelons, sweet potatoes, potatoes, grapes, tobacco, peach trees, pear trees and other chlorine-sensitive crops. The effect of applying potassium to potassium-sensitive crops is obvious, and legume crops and corn are very sensitive to potassium. Pay attention to the period of potassium application. Potash fertilizer should be applied early, generally based on basal application. The soil with poor fertilizer conservation can be applied in an appropriate amount in order to reduce the loss of potassium. For example, the absorption of potassium by corn is mainly in the seedling stage, but it is no longer absorbed at the flowering and heading stage. Pay attention to the amount of fertilizer applied. Scientific application of potash fertilizer can increase crop yield, improve the quality of agricultural products, and enhance crop resistance to lodging, disease and drought. However, excessive application of potash fertilizer will not only waste, but also cause physiological diseases such as yellow leaves and dry heartburn, and even affect yield and quality. Different crops need different amounts of potassium, watermelons and fruit trees need more potassium; corn and cotton need medium potassium; legume crops such as peanuts and soybeans and sweet potatoes and potatoes are sensitive to potassium, but they need less potassium, and wheat and millet also need less potassium. Pay attention to the combined application of N, P and organic fertilizer. First, the normal metabolism of crops requires the relative balance of various nutrients; second, there is interaction between potassium fertilizer and many nutrients, in which the effect of K and N is the most obvious and "complementary"; third, organic fertilizer can absorb potassium ions to prevent the loss of potassium. Pay attention to the application method and depth. At present, the utilization rate of potash fertilizer in China is generally 34% Murray 46%. In order to improve the utilization rate of potash fertilizer, potash fertilizer should be applied deeply and centrally. Because potassium is easy to be fixed in topsoil, potassium should be applied to the soil layer with more root distribution to facilitate root absorption. Generally, strip application and hole application are used.