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2. In order to meet the requirements of sorghum from jointing to heading, sorghum should apply the first fertilizer at the jointing stage, 150--225 kg of ammonium nitrate or 120--180 kg of urea per hectare; The second fertilizer is applied topdressing with 120 kg of ammonium nitrate or 75 kg of urea per hectare.
3. The uptake of nitrogen fertilizer by rice in rice began to increase gradually after turning 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, should be applied early and re-appropriate manure. Generally, 225 kg of ammonium sulfate can be applied per hectare 7-10 days after transplanting, and 100 kg of urea can be topdressed when heading.
4. Wheat wheat should be topdressed at the three-leaf stage, generally applying 195-270 kg of ammonium nitrate or 135-180 kg of urea per hectare. Due to the weakening of the ability of the root system to absorb nutrients from the soil in the later period of wheat, an extra-root fertilizer should be applied during heading and anthesis. Potassium dihydrogen phosphate 2250 g per hectare can be used, and 22.50 ml of triacontanol stock solution can be formulated into 300 kg of water. The mixture was sprayed; it was also possible to spray 450 kg of water per hectare with 3000 g of monobasic potassium phosphate and 15 kg of urea.
5. The critical period of nutrients for peanuts and peanuts is in the early stage of reproduction. About 15 days after the emergence of peanuts, flower buds begin to differentiate and nodules begin to form. When two pairs of lateral branches appear in the plant, nitrogen fertilizer should be topdressed one time, and 150 kg of ammonium nitrate or 120 kg of urea should be applied per hectare.
6. Soybean Soybeans are crops that require more nitrogen fertilizer. Usually, nitrogen fertilizers are applied once at the initial flowering stage of soybeans, which can reduce the rate of falling flowers and plants, and can prolong the life span of plants, increase grain weight, and increase yield. In general, 150--225 kg of ammonium nitrate or 120--180 kg of urea can be applied per hectare. During the period of soybean crusting, extra-root dressing can be conducted once, and the effect of increasing production is more obvious.
7. In addition to applying basic fertilizer to sunflowers, sunflowers must be topdressed. The fertilizer is usually applied at the budding stage, and 225 kg of ammonium nitrate or 180 kg of urea is applied per hectare. Conditional farmers can also perform extra-root topdressing at the flowering stage.
8. Castor timely fertilizer to ramie, can promote early maturation and high yield. The first time dressing can be combined with Dingmiao. After applying 225 kg ammonium nitrate or 180 kg urea per hectare, the second topdressing is carried out before flowering of ramie. The main fertilizer is phosphorus, which can increase the yield.
9. Beet sugar beets are quickly transferred to a flourishing growth stage after settling. They can be used in combination with a second shovel to spread 150 to 225 kg of ammonium nitrate or 120 to 180 kg of urea per hectare.
10. Potatoes can generally be topdressed before the flowering period of potatoes. Early maturing varieties are suitable for top dressing at the seedling stage. Mid-to-late-maturing varieties are topdressed before budding, with ammonium nitrate 195--225 kg urea 150 kg per hectare.
The best top-dressing period for ten crops
The best top-dressing period for ten crops 1. Corn and maize are the peak periods of nutrient absorption after jointing until the big bell-mouth period. Generally, the first fertilizer can be applied before and after jointing, and 150 kg of ammonium nitrate can be applied per hectare. 120 kg of urea; 7-10 days before tasselling, the second fertilizer should be applied, and 225 kg of ammonium nitrate or 180 kg of urea can be applied to each hectare. If the base fertilizer and seed fertilizer are more abundant and the soil is very fertile, you can concentrate on topdressing once, and use the second spade for deep fertilization.
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