1. Corn corn is the peak period of nutrient absorption after jointing to large bell mouth. Generally, the first fertilizer can be applied before and after jointing. 150 kg of ammonium nitrate or 120 kg of urea can be applied per hectare; -- 10 days, the second fertilizer should be applied, and 225 kg of ammonium nitrate or 180 kg of urea can be applied per hectare. If the base fertilizer and seed fertilizer are sufficient and the soil is very fertile, one can concentrate the top dressing and combine the second shovel for deep fertilization.
2. In order to meet the nutrient requirements of sorghum from jointing to heading, sorghum should be applied with the first fertilizer at the jointing stage, with 150--225 kg of ammonium nitrate or 120-180 kg of urea per hectare; After applying the second fertilizer, 120 kg of ammonium nitrate or 75 kg of urea per hectare.
3. Rice The absorption of nitrogen fertilizer by rice is gradually increased from the time of greening, and the peak of fertilizer absorption is reached at the peak of tillering. In order to promote early rice and early tillering, early application and heavy application of manure should be applied. Generally, 225 kg of ammonium sulfate per hectare can be applied 7-10 days after transplanting, and 100 kg of urea can be applied after heading.
4. Wheat Wheat should be topdressed during the three-leaf period, usually with 195--270 kg of ammonium nitrate or 135--180 kg of urea per hectare. In the later stage of wheat, due to the weakening ability of roots to absorb nutrients from the soil, a top dressing should be carried out at the heading and flowering stage. 2,250 g of potassium dihydrogen phosphate can be used per hectare, and 22.50 ml of triacontanol solution is prepared for 300 kg of water. The mixture is sprayed; it is also possible to use 3000 g of potassium dihydrogen phosphate per hectare, add 15 kg of urea, and spray 450 kg of water.
5. Peanut The nutrient critical period of peanuts is in the early stage of fertility. About 15 days after the emergence of peanuts, the flower buds begin to differentiate and the nodules begin to form. When two pairs of side branches appear in the plant, the nitrogen fertilizer should be applied once in time, and 150 kg of ammonium nitrate or 120 kg of urea should be applied per hectare.
6. Soybeans Soybeans are crops that require more nitrogen fertilizer. Usually, nitrogen fertilizer is applied once in the early flowering stage of soybeans, which can reduce the rate of flowering and falling, and can prolong the life of plants, increase grain weight and increase yield. Generally, 150--225 kg of ammonium nitrate or 120-180 kg of urea can be applied per hectare. In the pod-forming period of soybean, one-time external top dressing can be carried out, and the effect of increasing yield is more obvious.
7. Sunflowers In addition to applying the base fertilizer, sunflowers must be topdressed. Generally, topdressing is carried out in the bud stage, and 225 kg of ammonium nitrate or 180 kg of urea is applied per hectare. Conditional farmers can also carry out 1 extra-root dressing during the flowering period.
8. Ramie Timely application of ramie top dressing can promote early maturing and high yield of ramie. The first top dressing can be combined with the fixed seedlings. Each hectare is applied with 225 kg of ammonium nitrate or 180 kg of urea. The second top dressing is carried out before the flowering of the castor, and the main fertilizer is phosphorus, which can increase the yield.
9. Beet Beet is quickly transferred to the lush growth stage after the seedling is planted. In the early stage of beet growth, combined with the second shovel, 150--225 kg of ammonium nitrate or 120-180 kg of urea per hectare.
10. Potatoes can generally be topdressed before the flowering stage of the potato. Early-maturing varieties are suitable for topdressing at the seedling stage. The mid-late and late-maturing varieties are better applied before the buds, and the application of ammonium nitrate 195--225 kg of urea per hectare is 150 kg.
2. In order to meet the nutrient requirements of sorghum from jointing to heading, sorghum should be applied with the first fertilizer at the jointing stage, with 150--225 kg of ammonium nitrate or 120-180 kg of urea per hectare; After applying the second fertilizer, 120 kg of ammonium nitrate or 75 kg of urea per hectare.
3. Rice The absorption of nitrogen fertilizer by rice is gradually increased from the time of greening, and the peak of fertilizer absorption is reached at the peak of tillering. In order to promote early rice and early tillering, early application and heavy application of manure should be applied. Generally, 225 kg of ammonium sulfate per hectare can be applied 7-10 days after transplanting, and 100 kg of urea can be applied after heading.
4. Wheat Wheat should be topdressed during the three-leaf period, usually with 195--270 kg of ammonium nitrate or 135--180 kg of urea per hectare. In the later stage of wheat, due to the weakening ability of roots to absorb nutrients from the soil, a top dressing should be carried out at the heading and flowering stage. 2,250 g of potassium dihydrogen phosphate can be used per hectare, and 22.50 ml of triacontanol solution is prepared for 300 kg of water. The mixture is sprayed; it is also possible to use 3000 g of potassium dihydrogen phosphate per hectare, add 15 kg of urea, and spray 450 kg of water.
5. Peanut The nutrient critical period of peanuts is in the early stage of fertility. About 15 days after the emergence of peanuts, the flower buds begin to differentiate and the nodules begin to form. When two pairs of side branches appear in the plant, the nitrogen fertilizer should be applied once in time, and 150 kg of ammonium nitrate or 120 kg of urea should be applied per hectare.
6. Soybeans Soybeans are crops that require more nitrogen fertilizer. Usually, nitrogen fertilizer is applied once in the early flowering stage of soybeans, which can reduce the rate of flowering and falling, and can prolong the life of plants, increase grain weight and increase yield. Generally, 150--225 kg of ammonium nitrate or 120-180 kg of urea can be applied per hectare. In the pod-forming period of soybean, one-time external top dressing can be carried out, and the effect of increasing yield is more obvious.
7. Sunflowers In addition to applying the base fertilizer, sunflowers must be topdressed. Generally, topdressing is carried out in the bud stage, and 225 kg of ammonium nitrate or 180 kg of urea is applied per hectare. Conditional farmers can also carry out 1 extra-root dressing during the flowering period.
8. Ramie Timely application of ramie top dressing can promote early maturing and high yield of ramie. The first top dressing can be combined with the fixed seedlings. Each hectare is applied with 225 kg of ammonium nitrate or 180 kg of urea. The second top dressing is carried out before the flowering of the castor, and the main fertilizer is phosphorus, which can increase the yield.
9. Beet Beet is quickly transferred to the lush growth stage after the seedling is planted. In the early stage of beet growth, combined with the second shovel, 150--225 kg of ammonium nitrate or 120-180 kg of urea per hectare.
10. Potatoes can generally be topdressed before the flowering stage of the potato. Early-maturing varieties are suitable for topdressing at the seedling stage. The mid-late and late-maturing varieties are better applied before the buds, and the application of ammonium nitrate 195--225 kg of urea per hectare is 150 kg.
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