Potash fertilizer can help crops resist diseases.

In recent years, increasing the application of potassium fertilizer and constantly replenishing the loss of soil potassium has become one of the effective measures for high and stable crop yield. It is not difficult to understand that the technology that can make crops strong and grow well will certainly improve the stress resistance of crops, including drought resistance, cold resistance, disease resistance and so on. In 1998, the continuous drought in some parts of China highlighted the effect of using potash fertilizer on winter rape. The reason is, on the one hand, potassium fertilizer promotes root development and is conducive to water absorption; on the other hand, potassium increases the osmotic pressure of cell fluid, maintains the elasticity of cell wall, and reduces the loss of water; coupled with the regulatory effect of potassium on stomatal opening and closing, more in and less out, drought resistance is naturally obvious. Potash fertilizer also plays a significant role in enhancing crop disease resistance, especially for fungal and bacterial diseases that harm roots and stems, such as root rot, stem rot, Phytophthora, Pythium and so on. This is because potassium can thicken plant cell walls, toughen stems, resist parasitic invasion and expand in the body, while potassium can promote the transformation of low molecular compounds such as free amino acids and monosaccharides in crops into macromolecular substances such as protein, cellulose and starch, which makes pathogens lack nutritional sources, thus playing a role in disease prevention and resistance. Many experiments have proved that adequate potassium nutrition can reduce the incidence and harm of rice blast, bacterial blight and sheath blight; maize stem blight and smut; wheat scab, powdery mildew and tobacco mosaic disease. In some places, partial application of nitrogen fertilizer leads to serious occurrence of rice blast, rice brown spot, rice sheath blight, barley brown rust, wheat scab and some leaf spot, and most of the diseases can be alleviated obviously after combined application of potash fertilizer, so it is said that potash fertilizer is like pesticide. In fact, potash fertilizer can not directly kill germs, but help crops resist and inhibit germs. Its disease prevention effect is relative and slow. Once you encounter a climate that is very suitable for disease, it is still necessary to use symptomatic pesticides when the disease may be prevalent. In addition, balanced fertilization is also emphasized. Only when potash fertilizer is used in conjunction with other fertilizers can it play a role in increasing production and preventing diseases, and the more the better.