1. Corn: After the jointing to the big bell mouth, the corn is the peak period of nutrient absorption. Generally, the first fertilizer can be applied before and after jointing. 150 kg of ammonium nitrate or 120 kg of sugar can be applied per hectare; 7 to 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.

î—¥ î—¥ 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; Follow the second fertilizer, apply 120 kg of ammonium nitrate or 75 kg of urea per hectare.

î—¥ î—¥ 3. Rice: The absorption of nitrogen fertilizer by rice is gradually increased from the time of greening, and the highest peak of fertilizer absorption is achieved at the peak of the 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.

î—¥ î—¥ 4, wheat: wheat should be topdressed in the three-leaf period, generally 195-270 kg of ammonium nitrate or 135-180 kg of urea per hectare. In the later stage of wheat, due to the weakening of the 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 and 22.5 ml of triacontanol solution can be used for 300 kg of water per hectare. 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.

î—¥ î—¥ 5, peanut: peanut nutrition critical period is in the pre-fertility period, peanuts 15 days after emergence, flower buds began to differentiate a lot, the nodule began 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.

î—¥ î—¥ 6. Soybeans: Soybeans are crops that require more nitrogen fertilizer. Usually, nitrogen fertilizer is applied 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 per hectare. It can be applied with 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 planting the base fertilizer, it is necessary to carry out top dressing. 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 top dressing, can promote ramie early maturity and high yield. 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 beet will soon be transferred to the lush growth stage. In the early stage of beet growth, combined with the second shovel, the application of 150-225 kg of ammonium nitrate or 120-180 kg of urea per hectare.

10. Potato: Generally, topdressing can be carried out 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 bud, and the application of ammonium nitrate is 195-225 kg per hectare or 150 kg of urea. .
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