One, wheat. The topdressing of wheat should be at the 3-leaf stage with 13 kg-18 kg of ammonium nitrate or 9 kg-12 kg of urea per acre. In the late wheat root system, the ability to absorb fertility from the soil weakened, so it should be top-dressed once in the heading and flowering period, and 150 grams of potassium dihydrogen phosphate per mu, and 30 milligrams of triacontanol stock solution and 20 kg of water can be formulated into a mixed solution spray; Can use 200 grams of potassium dihydrogen phosphate per acre, add 1 kg of urea, spray 30 kg of water. Second, corn. After the jointing of corn to the big bell-mouth period, it is the peak period of absorbing nutrients. After the jointing, the top-dressing fertilizer is topped with 10 kg of ammonium nitrate or 8 kg of urea per mu, and the top dressing is applied 7 days to 10 days before tasselling. For the second time, 15 kg of ammonium nitrate or 12 kg of urea was applied per mu. If the base fertilizer and seed fertilizer are more abundant and the soil is very fertile, one can top-dress one fertilizer and combine the second cultivating with deep fertilization. Third, rice. The uptake of ammonia fertilizer by rice began to increase gradually after returning green, and reached the highest peak of fertilizer absorption during the peak period of tillering. In order to promote the early emergence of rice, early delivery, early application and re-appropriate sub-fertilizer. Can be applied 7 to 10 days after transplanting, applying 1.5 kg of ammonium nitrate per acre, and then catching 7 kg of urea when heading. Fourth, soybeans. Soybean is a crop that requires more nitrogen fertilizer. The application of nitrogen fertilizer at the early flowering stage can reduce the rate of flower drop and fruit loss, prolong the life of the plant, increase the grain weight, and increase the yield. Ammonium nitrate is generally applied between 10 kg and 15 kg per acre; during dressing stage, top dressing can be performed once and the effect of increasing production is more pronounced. Fifth, peanuts. About 15 days after the emergence of peanuts, flower buds began to differentiate and nodules began to form. When there are two pairs of lateral branches in the plant, a nitrogen fertilizer should be applied in a timely manner, and 10 kg of ammonium nitrate or 8 kg of urea should be topdressed per acre. Six, potatoes. Generally, topdressing can be carried out before the flowering period of the potato, while the early-maturing variety is suitable for dressing at the seedling stage, and the middle-late-maturing variety has better top dressing before budding, and each farmland can apply 13 kg-15 kg of ammonium nitrate or 10 kg of urea. Seventh, high school. In order to meet the requirements of sorghum from jointing to heading, the first fertilizer should be applied at the jointing stage, and 10 to 15 kg of ammonium sulphate or 8 to 12 kg of urea should be top-dressed per acre; Apply the first fertilizer, apply 8 kg of ammonium nitrate or 5 kg of urea per acre. China Agricultural Network Editor
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