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2. Sorghum: In order to meet the nutrient requirements of sorghum from jointing to heading, the first fertilizer should be applied at the jointing stage, and 150-225 kg of ammonium nitrate or 120-180 kg of urea should be applied per hectare; Secondary 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 can be applied per hectare 7-10 days after transplanting, and 100 kg of urea should be applied after heading.
4. Wheat: Wheat should be topdressed during the three-leaf period. Generally, 195-270 kg of ammonium nitrate or 135-180 kg of urea should be applied 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 per hectare, 22.5 ml of triacontanol solution and 300 kg of water are mixed into a mixture. Spraying is also carried out; 3000 g of potassium dihydrogen phosphate can be used per hectare, 15 kg of urea is added, and 450 kg of water is sprayed.
5. Peanut: The critical period of peanut nutrition 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, 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. Soybean: Soybean is a crop that requires more nitrogen fertilizer. It usually fills in nitrogen fertilizer at the initial flowering stage of soybeans. This can reduce the rate of flowering and falling, and can prolong the life of plants, increase grain weight and increase yield. Generally, it can be applied per hectare. 150-225 kg of ammonium nitrate or 120-180 kg of urea; in the pod-forming stage of soybean, a top-loading topdressing can be carried out, and the effect of increasing yield is more obvious.
7. Sunflower: In addition to the base fertilizer, the sunflower should be topdressed. Generally, topdressing is carried out in the bud stage, and 225 kg of ammonium nitrate or 180 kg of urea are applied per hectare. Conditional farmers can also carry out a root dressing during the flowering period.
8. Castor: timely application of ramie topdressing can promote early maturing and high yield of ramie. The first top dressing can be combined with the fixed seedlings. Each hectare is sold 225 kg of ammonium acid or 180 kg of urea. The second top dressing is carried out before the flowering of the nettle. The main fertilizer is phosphorus fertilizer, which can increase the yield.
9. Beet: After the seedling is fixed, the sugar beet will soon be transferred to the lush growth stage. In the early stage of beet growth, the second round of shovel can be combined with 150-225 kg of ammonium nitrate or 120-180 kg of urea per hectare.
The best topdressing period for nine crops
1. Corn: Corn is the peak period of nutrient absorption after jointing. It can be applied to the first fertilizer before and after jointing. 150 kg of ammonium nitrate or 120 kg of urea can be applied per hectare; For 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.
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