At present, there are many fertilizer brands on the fertilizer market in China. There are many problems with the selection of farmers, and fertilizers can only be properly selected. We asked Prof. Wang Xingren from China Agricultural University to give everyone a concentrated answer.
Question: Many farmers' friends are still unclear about the relationship between the color of potash fertilizer and the authenticity of chemical fertilizers. Why is potash red or white? The same manufacturer's products are also often a year's color. Is this fake fertilizer?
Expert: The color of potash has nothing to do with product quality. Pure potassium chloride is a white crystal. Potassium chloride fertilizers are made from natural potash minerals. They are not pure. They are milky white, light gray and different degrees of red due to different minerals. Red is the color of iron oxide, which is rust, and the farmer's sickle rust is red. Regardless of the color of potash, any qualified product is a good fertilizer.
Q: A farmer friend asked, why is the purchase of potassium chloride salty? Is it fake fertilizer?
Expert: Potassium chloride contains sodium chloride, which is salt that we usually eat, so it is salty, and even industrial grade potassium chloride, may contain 1.2% of sodium chloride, so there are salty and Not surprisingly. It cannot be concluded that the chemical fertilizer is true or false.
Q: Many farmers' friends are not aware of the circumstances under which potassium chloride or potassium sulfate is used.
Experts: Which of the two potash fertilizers is better? The main factors are crop characteristics and fertilization conditions. In general, tobacco is a bogey crop and potassium chloride should not be used. Because the use of more chlorine will reduce the quality of the tobacco, the smoke leaves will not burn. Saline-alkali land contains more salt, which may increase salt damage when potassium chloride is applied, and it is not suitable to apply potassium chloride. Potassium chloride is also not suitable as a fertilizer, so as not to burn seeds and seedlings. In addition, potassium chloride can be used, especially for chlorine insensitive corn, cotton, sorghum, rice and other field crops and rainy areas, potassium chloride should be preferred. Because proper fertilization is not only harmless to crops, but potassium chloride is cheaper than potassium sulfate. In rainy areas, rainwater can elute the residual chlorine in the soil. Therefore, potassium chloride can also be properly applied. Especially when applying basic potassium chloride, it does not matter. Potassium sulphate contains two kinds of potassium and sulfur nutrients, of which sulphur can improve the quality of berry crops, eggplant fruits and vegetables, soy, rape, and improve the flavor of onions, ginger, garlic, etc., so promote the application of potassium sulfate. In short, tobacco and saline land should not be applied potassium chloride; rice, corn, cotton and other crops can be applied to two kinds of potash, potassium chloride is more suitable; fruits, vegetables, fruit trees and cash crops promote the application of potassium sulfate, the right amount of chlorination Potassium can also be used.
Q: When topdressing DAP with rice, some of the fertilizer is very light and even blown away by wind. What is going on?
Experts: To prevent the diammonium phosphate from absorbing moisture and caking, the manufacturer coated a small amount of hydrophobic substance on the fertilizer granules. It has no effect on the quality of the fertilizer, but when applied in paddy fields, it often floats on the water due to water absorption difficulties. In order to avoid this, it is recommended to use diammonium phosphate as a basal fertilizer and plow it into the soil. If you do top dressing, mix it with wet mud before applying. (Sinochem Agricultural University Research Center)
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