What are the methods for selecting varieties of nitrogen fertilizer science:
There are many varieties of nitrogen fertilizer, which can be divided into ammonium nitrogen fertilizer, nitrate nitrogen fertilizer and amide nitrogen fertilizer according to the form of the compound. The ammonium nitrogen fertilizer includes ammonium hydrogencarbonate, ammonium sulfate, ammonium chloride, ammonia water, liquid ammonia, etc., the nitrate nitrogen fertilizer includes ammonium nitrate, sodium nitrate, calcium nitrate, etc., and the amide nitrogen fertilizer includes urea and calcium cyanamide (lime nitrogen). In order to improve the application effect of nitrogen fertilizer, it is very important to scientifically select nitrogen fertilizer varieties.
In general, ammonium-based fertilizers should be applied to crops with high carbohydrate content such as potatoes. The application of ammonium nitrogen and nitrate nitrogen in wheat, corn and other cereal crops is also effective, but in the rainy areas, in order to prevent nitrogen leaching, it is advisable to apply ammonium nitrogen fertilizer. The use of urea and ammonium chloride in rice fields is better, and ammonium sulfate and nitrate nitrogen fertilizers are not suitable. Because the sulfate is easily reduced to hydrogen sulfide in the paddy field, the rice roots are blackened or even rotted, and the nitrate nitrogen is easily lost in the paddy field with water leaching and denitrification. For hemp crops, ammonium chloride should be used because chloride ions increase the toughness and tensile strength of the fiber. Tobacco is best applied with nitrate nitrogen and ammonium nitrogen. Nitrate nitrogen can improve the flammability of tobacco, while ammonium nitrogen can promote the formation of aromatic volatile oil in tobacco leaves and increase the aroma of tobacco. Therefore, two forms of nitrogen fertilizer Combined with application can improve its quality. Ammonium sulfate is applied to soils that are deficient in sulfur to help improve crop sulfur nutrition. Ammonium chloride is not suitable for use in tobacco, grape, potato, sweet potato, sugar beet, citrus, tea, sugar cane, watermelon, melon and other chlorine-sensitive crops that are sensitive to chloride ions, otherwise it will obviously affect its yield and quality.
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