What is the role of potash?

First, the effect of potash fertilizer on crops

1. It can promote the better use of nitrogen by crops, increase the content of protein, and promote the production of sugar and starch;

2. The nucleolus, seeds, fruits and tubers, roots are enlarged, and the shape and color are beautiful;

3. Improve the oil content of oil crops and increase the content of vitamin C in fruits;

4. Accelerate the ripening of fruits, vegetables and other crops, improve the shape, size, color and flavor of fruit vegetables, and enhance their storability

5. Enhance the ability of products to resist bumps and natural rot, and extend the storage and transportation period;

6. Increase the strength, length and fineness of cotton and hemp crop fibers, and the purity of color.

Second, a reasonable application of potash

If the crop lacks potassium fertilizer, it will get "chondrosis", which is easy to fall, often troubled by pathogenic pests. Potassium fertilizer can be used as base fertilizer, and can also be used as top dressing. Some varieties can also be used as foliar fertilizer, but the application effect of base fertilizer and foliar fertilizer is good. Potassium fertilizer is used as the base fertilizer to meet the demand for potassium in the whole growth period of crops. It is especially important for crops with short growing season and soils with obvious potassium deficiency. For crops with long growing seasons, such as cotton, a combination of base application and foliar application can be used. For sandy soils, a combination of base application and topdressing can be used. The mobility of potassium in the soil is between nitrogen and phosphorus. At present, the available potassium content in the soil is less than 100 mg/kg/mu; the soil available potassium content is below 100-150 mg/kg, and the K??O??%-5 kg/mu can be used as soil quick-acting potassium. When the content is more than 150 mg/kg, no chemical potassium fertilizer can be applied depending on the crop type. For example, the results of soil tests in the past three years in our province show that the content of available potassium is low, which is due to the importance of diammonium phosphate and urea, and the use of organic fertilizer and potassium fertilizer. You can purchase 15-20 kg of urea and 5 kg of potash by purchasing urea, increase the amount of potash used, improve the disease resistance and resistance of crops, and achieve balanced yield increase.

Third, the harmful effects of excessive application of potassium fertilizer

Potassium fertilizer has many benefits, but the amount is not as high as possible. It is used strictly according to the required dosage. Excessive application will have adverse effects on crops.

1. Excessive application of potassium fertilizer not only wastes valuable resources, but also causes the absorption of magnesium and calcium by crops to decrease, which hinders the growth of crops.

2. Excessive application of potassium fertilizer will cause harmful metals and harmful bacteria in some plots to exceed the standard, resulting in deterioration of soil properties and water pollution;

3. Excessive application of potassium fertilizer will weaken crop production capacity.