At present, it is the season of Spring-sown crops in China, and the summer-sowed crops such as summer maize are also in the seedling stage. Farmers’ friends have raised a lot of questions about fertilizers and fertilization, and they are now concentrated.
Mr. Liu from Pingdu, Shandong Province asked: This year, wheat matures late, and corn has not been able to feed the fertilizer. How to topdress in the later period?
A: First of all, in the 4 leaf stage, combined with the fixed seedlings, the NPK fertilizer should be applied as early as possible, and the fertilizer applied to the base fertilizer should be added. It is recommended to apply 5~10 kg of urea and potassium chloride per acre, 4~6 kg of diammonium phosphate or 15~20 kg of high nitrogen and potassium compound fertilizer. Apply urea 20~25 kg in the period from jointing to large flare. The specific application amount and fertilization time should be adapted to local conditions, and the fertilization of seedlings and seedlings should be less appropriate and late application; suitable early application and multi-application of thin and weak seedlings.
Ms. Xiang of Jiangxi Yujiang asked: This year the rain is very big, many rice has been flooded, how to fertilize after the water has retreated?
A: First of all, we should drain as soon as possible, retreat to the normal water level and timely fill the fertilizer after the seedlings. Flooding washed away a lot of nutrients in the soil, especially nitrogen and potassium. Therefore, it is recommended to apply 10~15 kg of urea per mu, 5-10 kg of potassium chloride, or 15-20 kg of high-nitrogen potassium compound fertilizer. If the flooding time is longer and the rice seedling damage is heavier, spray a 0.5% urea solution, 0.2% potassium dihydrogen phosphate solution, spray once a week for 2 to 3 times. .
Mr. Guan of Jilin Songyuan asked: Can compound fertilizer be used for one-time fertilization?
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 NPK 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 in the case of mechanized fertilization, the fertilizer should be applied 40 to 60 kg before or during sowing, of which 1/5 is applied to the soil layer within 10 cm and 4/5 is applied to the soil layer of 15 to 20 cm. Otherwise, we should use the method of base fertilizer and topdressing, and use 20~30kg “special fertilizer†per mu and 5~10kg diammonium phosphate as base fertilizer, and then apply 15~20kg urea in the big bell period.
Ms. Su of Shangqiu, Henan Province asked: After the urea in the greenhouse, the water is poured, and the leaves turn green after 4~5 days. What is going on?
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 it is 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, Hubei asked: There is a habit in the local farming. No matter what crops you like to apply potassium sulphate or sulphur-based compound fertilizer, is this good?
A: Please remember that potassium chloride is the protagonist of potash. In addition to the specific chlorine-removing crops such as tobacco, potassium sulphate must be applied. Soybean, onion garlic, rapeseed and berry sulphur crops can be used with potassium sulphate. Use potassium chloride. 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, blindly promoting potassium sulphate and sulphur-based compound fertilizers not only increases the burden on farmers, but also residues in the soil that acidify the soil, or combine with calcium ions to form gypsum-like things that cause soil compaction.
(Senior Consultant of Sinofert, Professor of China Agricultural University Wang Xingren)
Farmers Daily
Mr. Liu from Pingdu, Shandong Province asked: This year, wheat matures late, and corn has not been able to feed the fertilizer. How to topdress in the later period?
A: First of all, in the 4 leaf stage, combined with the fixed seedlings, the NPK fertilizer should be applied as early as possible, and the fertilizer applied to the base fertilizer should be added. It is recommended to apply 5~10 kg of urea and potassium chloride per acre, 4~6 kg of diammonium phosphate or 15~20 kg of high nitrogen and potassium compound fertilizer. Apply urea 20~25 kg in the period from jointing to large flare. The specific application amount and fertilization time should be adapted to local conditions, and the fertilization of seedlings and seedlings should be less appropriate and late application; suitable early application and multi-application of thin and weak seedlings.
Ms. Xiang of Jiangxi Yujiang asked: This year the rain is very big, many rice has been flooded, how to fertilize after the water has retreated?
A: First of all, we should drain as soon as possible, retreat to the normal water level and timely fill the fertilizer after the seedlings. Flooding washed away a lot of nutrients in the soil, especially nitrogen and potassium. Therefore, it is recommended to apply 10~15 kg of urea per mu, 5-10 kg of potassium chloride, or 15-20 kg of high-nitrogen potassium compound fertilizer. If the flooding time is longer and the rice seedling damage is heavier, spray a 0.5% urea solution, 0.2% potassium dihydrogen phosphate solution, spray once a week for 2 to 3 times. .
Mr. Guan of Jilin Songyuan asked: Can compound fertilizer be used for one-time fertilization?
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 NPK 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 in the case of mechanized fertilization, the fertilizer should be applied 40 to 60 kg before or during sowing, of which 1/5 is applied to the soil layer within 10 cm and 4/5 is applied to the soil layer of 15 to 20 cm. Otherwise, we should use the method of base fertilizer and topdressing, and use 20~30kg “special fertilizer†per mu and 5~10kg diammonium phosphate as base fertilizer, and then apply 15~20kg urea in the big bell period.
Ms. Su of Shangqiu, Henan Province asked: After the urea in the greenhouse, the water is poured, and the leaves turn green after 4~5 days. What is going on?
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 it is 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, Hubei asked: There is a habit in the local farming. No matter what crops you like to apply potassium sulphate or sulphur-based compound fertilizer, is this good?
A: Please remember that potassium chloride is the protagonist of potash. In addition to the specific chlorine-removing crops such as tobacco, potassium sulphate must be applied. Soybean, onion garlic, rapeseed and berry sulphur crops can be used with potassium sulphate. Use potassium chloride. 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, blindly promoting potassium sulphate and sulphur-based compound fertilizers not only increases the burden on farmers, but also residues in the soil that acidify the soil, or combine with calcium ions to form gypsum-like things that cause soil compaction.
(Senior Consultant of Sinofert, Professor of China Agricultural University Wang Xingren)
Farmers Daily
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