Ten questions about fertilization
Wang Xingren, a senior consultant of Sinofert and a professor at China Agricultural University, answered questions about fertilizers and fertilization raised by farmers.
Mr. Gao of Tongchuan, Shaanxi Province asked: Are the diammonium phosphates green? Does color affect the quality of the fertilizer?
Expert: Diammonium has a variety of colors, the specific color and phosphate rock resources and granulation coloring, which is related to the brand, and has nothing to do with the quality of fertilizer. For example, the United States diammonium is mostly dark brown, Morocco and Tunisian diammonium are bean green, and some diammonium is dark gray.
Ms. Sun from Suzhou, Anhui Province asked: Why do waters come out after mixing diammonium, urea and potassium fertilizers? How to solve them?
Expert: These fertilizers are more hygroscopic than before mixing, so they are easier to agglomerate, so they should be mixed and used. It should not be used for a long time.
Mr. Tu of Zhangzhou, Fujian Province asked: Is the application of calcium superphosphate or good?
Expert: Ditch Shibi is good. Because the area of ​​direct contact with the soil after the application of the superphosphate is increased, it is easily fixed by iron and aluminum in the soil to form a poorly soluble phosphate which is not easily absorbed by the crop.
Ms. Xiao from Siping, Jilin Province asked: Is diammonium precipitated after stirring in water? Is this normal?
Expert: Normal, because the phosphorus in diammonium has a certain solubility in water, only a part of it is water-soluble, and the rest of the phosphorus can be gradually dissolved and absorbed by the crop.
Ms. Huang from Liuzhou, Guangxi Province asked: What should I do if the citrus tree is deficient in magnesium?
Expert: You can apply 1 kg of calcium magnesium phosphate fertilizer to each tree, so that both phosphorus and calcium and magnesium are added. In order to be effective, it is also possible to spray 2 to 3 times of 0.1% to 0.2% magnesium sulfate solution in the spring shoot growth phase and the young fruit period.
Mr. Jia from Cangzhou, Hebei Province asked: Why do you need to apply urea and potassium fertilizer when diammonium is used as wheat base fertilizer?
Expert: Diammonium contains 18% nitrogen and 46% phosphorus. It belongs to low-nitrogen, high-phosphorus and potassium-free compound fertilizers. Balanced fertilization can only be achieved after applying proper amount of nitrogen and potassium fertilizer.
Mr. Zheng from Xuzhou, Jiangsu Province asked: Phosphorus and potassium fertilizers are not easy to lose. Why can't they do corn topdressing?
Experts: There are two reasons why phosphorus and potassium fertilizers should not be used as corn topdressing. First, phosphorus and potassium fertilizers are difficult to penetrate with rainwater or irrigation, and they are applied to the surface, and the crops are not absorbed. Second, it is difficult to fully exert the fertilizer effect. Therefore, phosphorus and potassium fertilizers are mainly used as base fertilizers for field crops.
Mr. Yao from Lanzhou, Gansu Province: Why do you need to apply P and K fertilizers for growing tomatoes, sweet peppers and melons and vegetables?
Experts: Compared with field crops, these vegetables have a large demand for phosphorus and potassium fertilizers, and require the soil to maintain a high level of nutrient supply. Therefore, not only the application of phosphorus and potassium fertilizers when applying the base fertilizer, but also the application of some phosphorus and potassium fertilizers when topdressing .
Mr. Zhu from Kaifeng, Henan Province asked: How to apply fertilizer to sand and watermelon?
Expert: Use as much organic fertilizer as possible compared to other soils. For fertilizers, especially nitrogen fertilizers, a small amount of times, the proportion of base fertilizers generally does not exceed 40% to 50%.
Ms. Zhou, a tobacco farmer from Yunnan, asked: I heard that rainwater can wash off the chlorine of potassium chloride. Yunnan rainwater is large, can you apply potassium chloride to tobacco?
Expert: Tobacco is a chlorine-free crop. Applying chlorinated fertilizer will reduce the quality of tobacco and make cigarettes difficult to burn. Because tobacco is a special commodity, in order to protect the quality of tobacco and the reputation of the commodity, it is best not to apply chlorinated fertilizer.
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