According to our field trial results, scientific application of potash fertilizer can increase crop yields, improve the quality of agricultural products, and enhance the resistance of crops to lodging resistance, disease resistance, and drought; excessive application of potash fertilizer not only costs more money, but also causes yellow leaves and stems. Heartaches and other physiological diseases can even affect the yield and quality of crops. In order to prevent farmers' friends from making mistakes in the application of potash, I will briefly introduce the scientific application of potash fertilizer. 1. Determine the potash variety. Potassium fertilizers mainly include potassium chloride and potassium sulfate. Potassium chloride has high potassium content and is cheap. It is suitable for crops such as common crops and cucumbers, bitter gourds and other sulfur-sensitive crops. Potassium sulphate has low potassium content and is suitable for high prices. Water-sensitive crops such as watermelons, sweet potatoes, grapes, tobacco, peach trees, and pear trees. 2. Determine the amount of potash. Different crops need different amounts of potassium. Watermelon and fruit trees need more potassium, peanuts, soybeans and other legumes, sweet potatoes, potatoes and other roots, tuber crops and corn, cotton need potassium medium, wheat, millet need less potassium. The potassium supply capacity of different soils is also different. According to our results of soil testing in Hengshui, Shijiazhuang, Zhangzhou, Baoding, Handan, and Xingtai, most of the lands are basically mildly potassium deficient. Through our large number of field trials, it is shown that in the general plots, the optimal acre rates for growing cotton, wheat, and pure potassium are: 2 to 5 kg, 1.5 to 3 kg, and the potassium chloride equivalent to 60% nutrient content is: 3.5 ~ 8.5 kg, 2.5 ~ 5 kg; planting watermelons, fruit trees fruit period, the best amount of pure potassium is: 8 ~ 12 kg, 13 ~ 20 kg, equivalent to 50% of the nutrients content of potassium sulfate are: 16 to 24 kg and 26 to 40 kg. 3. With nitrogen fertilizer, phosphate fertilizer, organic fertilizer application. The normal metabolism of the crop requires that various nutrients remain relatively balanced, otherwise problems will arise. Many tests have shown that only on the basis of sufficient supply of nitrogen and phosphorus nutrients, potash fertilizer can play a good role; organic fertilizer can absorb potassium ions and prevent the loss of potassium fertilizer. 4. Determine the application method and fertilization location. Potassium fertilizers move slowly in the soil and should be used as base fertilizers. If topdressing is performed, it should be applied as early as possible. The best location for fertilization is in soil layers with the most root distribution. Potassium fertilizer is easy to lose with water, and it should be concentrated or applied in the application of large-size special fertilizer.
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