Mr. Guan of Jilin Songyuan City asked: Can the compound fertilizer be used for one-time fertilization?

Answer: In two cases: 1) Because of drought and water shortage, one-time fertilization is necessary, and high-nitrogen-potassium-based compound fertilizers can be used, preferably nitrogen fertilizers have sustained-release properties. 2 There are mechanized fertilization conditions. Fertilizers are applied at different soil depths before sowing, and the compound fertilizers used are also selected for high nitrogen types.

Mr. Lu of Liaoning Haicheng asked: How do you buy a corn-specific compound fertilizer with a nitrogen, phosphorus, and potassium nutrient ratio of 22:8:15?

Answer: From the perspective of the special fertilizer's nutrient ratio, it is suitable for one-time fertilization. If it is used as a base fertilizer, it will be topdressed with nitrogen fertilizer, which will increase the total amount of nitrogen applied. Therefore, it is suggested that under the condition of mechanized fertilization, 40-60 kg of fertilizer should be applied before or during sowing, of which 1/5 is applied within 10 cm of soil, and 4/5 is deep in 15-20 cm of soil. Otherwise, basal fertilizers and topdressing methods should be applied, and 20 to 30 kilograms of “special fertilizer” and 5 to 10 kilograms of diammonium phosphate should be used as base fertilizer for each mu, and 15 to 20 kilograms of urea should be applied at the big bellmouth stage.

Ms. Su of Shangqiu City, Henan Province asked: After irrigation with urea in greenhouses, the leaves turn green after 4 to 5 days. What is going on?

Answer: There are two possibilities. First, immediately after application, water is poured into the soil, and urea goes to the bottom of the soil with water, causing short-term de-fertilization. Because urea needs 3 to 5 days of microbial transformation time after it is applied to the soil, it can be absorbed by the crop and become adsorbed by the soil after it is changed into ammonium nitrogen; second, the amount of irrigation is too large and the fertilizer is rinsed to the lower layer. Therefore, when fertilizing, it is necessary to prevent large and large fertilizers.

Mr. Sheng of Xiaogan City, Hubei Province asked: There is a habit in farming in the local area. No matter what the crops are like, potassium sulfate or sulfur-based compound fertilizer is used.

Answer: Potassium chloride is the protagonist of potash fertilizer. Potassium sulphate must be applied to specific bogey crops such as tobacco. Potassium sulphate should be used when soybeans, onions, garlic, rape and berry-like sulfur crops are available when conditions permit. Because most plants use potassium chloride beneficial, especially in the rain and irrigation conditions, and potassium chloride is cheaper than potassium sulfate, potassium content is high. On the contrary, the blind promotion of potassium sulfate and sulfur-based compound fertilizers not only increases the burden on farmers, but sulfate residues in the soil will also acidify the soil, or combine with calcium ions to form something like gypsum, which will cause soil consolidation.

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