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Answer: In two cases, you can: 1 have to use one-time fertilization due to drought and water shortage, and you can use high-nitrogen potassium compound fertilizer. The best nitrogen fertilizer has sustained release. 2 There are mechanized fertilization conditions, the fertilizer is applied to different soil depths before sowing, and the compound fertilizer used should also be selected from high nitrogen type.
Mr. Lu from Haicheng, Liaoning Province asked: How to apply corn-specific compound fertilizer with a ratio of nitrogen, phosphorus and potassium to 22:8:15?
A: From the ratio of nutrient distribution of special fertilizers, it is suitable for one-time fertilization. If it is used as base fertilizer, and then applied nitrogen fertilizer, the total amount of nitrogen will be high. Therefore, it is recommended that under the condition of mechanized fertilization, the fertilizer should be applied 40-60 kg before or during sowing, 1/5 of which is applied to the soil layer within 10 cm, and 4/5 is applied to the soil layer of 15-20 cm. Otherwise, it should be based on the method of base fertilizer and topdressing, and use 20 to 30 kilograms of "special fertilizer" per acre and 5 to 10 kilograms of diammonium phosphate as base fertilizer, and then apply 15 to 20 kilograms of urea in the large flare period.
Ms. Su from Shangqiu City, Henan Province asked: After the urea was applied to the greenhouse, the water was poured. After 4 to 5 days, the leaves turned green. What happened?
A: There are two possibilities. One is to irrigate the water immediately after application, and the urea runs to the bottom of the soil with water, causing short-term de-fertilization. Because urea needs to have 3 to 5 days of microbial transformation time after being applied to the soil, it can be absorbed by the crop and adsorbed by the soil after it becomes ammonium nitrogen. Second, the amount of irrigation is too large, and the fertilizer is rinsed to the lower layer. Therefore, when fertilizing, try to prevent big water and big fertilizer.
Mr. Sheng from Xiaogan City, Hubei Province asked: There is a habit in the local farming. No matter what crops you like to apply potassium sulphate or sulfur-based compound fertilizer, is this good?
A: Potassium chloride is the protagonist of potash. Potassium sulphate must be applied in certain chlorine-removing crops such as tobacco. Potassium sulphate should be used in the case of soybean, onion, rape, and berry-like sulphur crops. Because potassium chloride is beneficial to most crops, especially in rainy and irrigation conditions, and potassium chloride is cheaper than potassium sulfate, and potassium is high. Conversely, the blind promotion of potassium sulphate and sulphur-based compound fertilizer not only increases the burden on farmers, but also the sulphate remaining in the soil acidifies the soil, or combines with calcium ions to form something like gypsum to cause soil compaction.
(Senior Consultant of Sinofert, Professor of China Agricultural University Wang Xingren)
Farmers Daily 
Mr. Guan of Songyuan City, Jilin Province: Can compound fertilizer be used for one-time fertilization?
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