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Under the principle of balanced fertilization, maize is the peak period of nutrient absorption after jointing until the big bell-mouth period, and it is generally possible to apply the first fertilizer before and after jointing. Per acre topdressing 10 kg of urea; 7-10 days before tasseling, top dressing should be applied for the second time, each mu can be applied top 20 kg of urea. If the base fertilizer and seed fertilizer are more abundant and the soil is very fertile, you can focus on topdressing once, and combine the second time with deep soil fertilization.
Gao Yan
In order to meet the needs of sorghum from the jointing to the heading period, the fertilizer should be topdressed for the first time during the jointing stage, with 8-12 kilograms of urea applied per acre; the second time a second crop is applied at the booting flag stage, with 10 kilograms of topdressing urea per acre.
Soybean
Soybeans are more nitrogen-needed crops, but its root-fixing nitrogen can solve some of the nitrogen sources. However, it is also necessary to top-dress during the growth period, usually applying nitrogen fertilizer 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 the plants, increase the grain weight, and increase the yield. Generally, 8-12 kg of urea can be topdressed per mu. During the period of soybean pod maturation, one extra-root topdressing can be performed, that is, multi-element fertilizer applied on the foliage, and the effect of increasing production is more obvious.
Rice
The absorption of nitrogen 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. Usually 7-10 days after transplanting. Each mus of topdressing urea 10 kg, heading and then topdressing urea 15-20 kg.
peanut
The critical period of nutrients for peanuts is in the early period 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 applied in a timely manner, and 5-10 kg of urea should be topdressed per acre. Peanuts combined with earth after flowering, spraying multi-element micro-fertilizer, will help reduce the empty fruit rate and increase peanut production.
The best top-dressing period for crops
corn