Mr. Li from Jiaozuo City, Henan Province: Do you need to apply potash fertilizer after the straw is returned to the field?
A: Long-term continuous straw returning to the field can save potash, but yam has a large demand for potash. Although the straw returning to the field still needs an appropriate amount of potassium fertilizer, especially in the first few years of straw returning to the field.
Ms. Feng from Hengshui City, Hebei Province: Is there any zinc deficiency in the corn and the use of straw in the field?
Answer: Straw returning can save potassium fertilizer and increase soil organic matter content. It has little effect on correcting soil zinc deficiency. If zinc is lacking, it is necessary to apply zinc fertilizer to soil or foliar surface.
Mr. Zou of Qihe County, Shandong Province asked: After the wheat straw is returned to the field, the corn seedlings turn yellow. What is going on?
A: There may be many reasons for the yellowing of corn seedlings. Special attention should be paid to adjusting the carbon to nitrogen ratio of straw. When returning to the field, it is necessary to add 3 to 5 kg of urea per acre.
Mr. Zhang from Chaoyang City, Liaoning Province asked: What are the characteristics of nitrogen, phosphorus and potassium nutrient distribution ratios of corn, rice and other field crops? What kind of compound fertilizer should I choose?
A: The ratio of nitrogen to phosphorus in the field crop base fertilizer is roughly 1:1. The proportion of potash fertilizer varies with soil and crop in different regions. Therefore, the field crop base fertilizer should use 15-15-15 and other general-purpose compound fertilizer, or the proportion of potassium is lower. On this basis, the nitrogen fertilizer such as urea which is roughly equivalent to the base fertilizer nitrogen is applied.
Ms. Huang from Xiangtan City, Hunan Province: What is the difference between fertilization in double season and early rice?
A: The yield of late rice is generally higher than that of early rice, and the amount of fertilizer can be appropriately larger; the late rice can be used after the fertilizer is applied, so the application amount of phosphorus and potassium can be appropriately reduced; the application of nitrogen in the late rice should not be applied too much, and the fertilization period is too late, in case Greedy and late.
Mr. Shao from Mishan City, Heilongjiang asked: “The oldest three†(urea, diammonium phosphate, potassium chloride) should be applied according to the nutrient dosage and proportion of compound fertilizer. Is the effect the same?
A: A large number of scientific experiments and production practices have proved that the fertilizer effects of the two are basically the same, but the compound fertilizer, especially the granular compound fertilizer, has the advantages of uniform nutrient distribution, convenient application, labor saving and labor saving.
Mr. Liu from Wenxian County, Henan Province: This is the production area of ​​iron stick yam. Some farmers will put a bag of half to two bags of ternary compound fertilizer (75-100 kg) on ​​the ground at the time of topdressing. It’s quite good, is that correct?
A: This is not correct. The reason is that the amount of fertilization is too large, generally 30 to 50 kg is enough, and high-nitrogen potassium compound fertilizer should be used, and the soil should be covered after application; the second is the application of rain, only most of the nitrogen fertilizer and some potassium fertilizer in the compound fertilizer. It works, and nitrogen fertilizer will be lost. Phosphate fertilizer is basically ineffective in the season. Although it is harmless to crop growth, it causes waste of fertilizer or accumulation of funds, and even leads to the lack of certain trace elements.
Ms. Qian from Anhui Hexian asked: How many rice buckwheat and rapeseed we have here, how should we manage after the spring?
A: First of all, we must first dig up the "three ditch" (caogou, lobe, and furrow) to lower the groundwater level and raise the temperature of the soil. After the spring, we should grasp the appropriate cultivating loose soil during the ploughing period; Apply quantitative fertilizer. For example, winter wheat with weak seedlings but sensational feet can be used for 4 to 6 kg of urea per acre in the regreening period and 8 to 10 kg at the time of jointing.
Mr. Mu from Zhengzhou City, Henan Province: The greenhouses here sometimes encounter cold springs. What should I do?
A: Pay attention to the weather forecast and do a good job of prevention work; pay attention to temperature changes, gradually expose the shed and ventilate to prevent the occurrence of “flash seedlingsâ€; prevent large water and large fertilizers, especially nitrogen fertilizer, strengthen pest control, and carry out comprehensive management. . (Professor Wang Xingren, China Agricultural University)
Farmers Daily
A: Long-term continuous straw returning to the field can save potash, but yam has a large demand for potash. Although the straw returning to the field still needs an appropriate amount of potassium fertilizer, especially in the first few years of straw returning to the field.
Ms. Feng from Hengshui City, Hebei Province: Is there any zinc deficiency in the corn and the use of straw in the field?
Answer: Straw returning can save potassium fertilizer and increase soil organic matter content. It has little effect on correcting soil zinc deficiency. If zinc is lacking, it is necessary to apply zinc fertilizer to soil or foliar surface.
Mr. Zou of Qihe County, Shandong Province asked: After the wheat straw is returned to the field, the corn seedlings turn yellow. What is going on?
A: There may be many reasons for the yellowing of corn seedlings. Special attention should be paid to adjusting the carbon to nitrogen ratio of straw. When returning to the field, it is necessary to add 3 to 5 kg of urea per acre.
Mr. Zhang from Chaoyang City, Liaoning Province asked: What are the characteristics of nitrogen, phosphorus and potassium nutrient distribution ratios of corn, rice and other field crops? What kind of compound fertilizer should I choose?
A: The ratio of nitrogen to phosphorus in the field crop base fertilizer is roughly 1:1. The proportion of potash fertilizer varies with soil and crop in different regions. Therefore, the field crop base fertilizer should use 15-15-15 and other general-purpose compound fertilizer, or the proportion of potassium is lower. On this basis, the nitrogen fertilizer such as urea which is roughly equivalent to the base fertilizer nitrogen is applied.
Ms. Huang from Xiangtan City, Hunan Province: What is the difference between fertilization in double season and early rice?
A: The yield of late rice is generally higher than that of early rice, and the amount of fertilizer can be appropriately larger; the late rice can be used after the fertilizer is applied, so the application amount of phosphorus and potassium can be appropriately reduced; the application of nitrogen in the late rice should not be applied too much, and the fertilization period is too late, in case Greedy and late.
Mr. Shao from Mishan City, Heilongjiang asked: “The oldest three†(urea, diammonium phosphate, potassium chloride) should be applied according to the nutrient dosage and proportion of compound fertilizer. Is the effect the same?
A: A large number of scientific experiments and production practices have proved that the fertilizer effects of the two are basically the same, but the compound fertilizer, especially the granular compound fertilizer, has the advantages of uniform nutrient distribution, convenient application, labor saving and labor saving.
Mr. Liu from Wenxian County, Henan Province: This is the production area of ​​iron stick yam. Some farmers will put a bag of half to two bags of ternary compound fertilizer (75-100 kg) on ​​the ground at the time of topdressing. It’s quite good, is that correct?
A: This is not correct. The reason is that the amount of fertilization is too large, generally 30 to 50 kg is enough, and high-nitrogen potassium compound fertilizer should be used, and the soil should be covered after application; the second is the application of rain, only most of the nitrogen fertilizer and some potassium fertilizer in the compound fertilizer. It works, and nitrogen fertilizer will be lost. Phosphate fertilizer is basically ineffective in the season. Although it is harmless to crop growth, it causes waste of fertilizer or accumulation of funds, and even leads to the lack of certain trace elements.
Ms. Qian from Anhui Hexian asked: How many rice buckwheat and rapeseed we have here, how should we manage after the spring?
A: First of all, we must first dig up the "three ditch" (caogou, lobe, and furrow) to lower the groundwater level and raise the temperature of the soil. After the spring, we should grasp the appropriate cultivating loose soil during the ploughing period; Apply quantitative fertilizer. For example, winter wheat with weak seedlings but sensational feet can be used for 4 to 6 kg of urea per acre in the regreening period and 8 to 10 kg at the time of jointing.
Mr. Mu from Zhengzhou City, Henan Province: The greenhouses here sometimes encounter cold springs. What should I do?
A: Pay attention to the weather forecast and do a good job of prevention work; pay attention to temperature changes, gradually expose the shed and ventilate to prevent the occurrence of “flash seedlingsâ€; prevent large water and large fertilizers, especially nitrogen fertilizer, strengthen pest control, and carry out comprehensive management. . (Professor Wang Xingren, China Agricultural University)
Farmers Daily
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