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The absorption of nitrogen fertilizer from rice during the best dressing period was gradually increased after returning green, and reached the highest peak 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 after transplanting 7-10 days, topdressing 10 kg of urea per acre, heading and then topdressing 15-20 kg of urea.
The best fertilizer application period of Gaochun is to meet the nutrient requirement of the sorghum from the jointing stage to the heading stage, and the top-dressing fertilizer should be applied at the jointing stage, and the topdressing urea should be 8~12 kg per mu; Urea topdressing 10 kg per mu.
Peanut The best nutritional period for peanuts is the critical period of nutrients in the early period of reproduction. About 15 days after the emergence of peanuts, flower buds begin to differentiate and nodule formation begins. When two pairs of lateral branches appear in the plant, nitrogen fertilizer should be applied in a timely manner, and topdressing urea 5~10 kg per acre. Peanuts combined with earth after flowering, spraying multi-element micro-fertilizer, will help reduce the empty fruit rate and increase peanut production.
Soybeans in the best top-dressing period are more nitrogen-neutral crops, but it is possible that root-tolerance nitrogen fixation 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 to 12 kg of urea can be topdressed per mu. In the period of soybean pods, if multiple fertilizers are applied to the leaves for one time, the yield increase effect is more obvious.
The best fertilizers for various crops
Corn in the best fertilizer-bearing period under the principle of balanced fertilization, corn in the jointing period until the big bell-mouth period, is the peak period of absorption of nutrients, generally before and after the jointing of the first application of fertilizer. Applying 10 kg of urea per acre; 7-10 days before tasselling, the second fertilizer should be applied top-up and applying 20 kg of urea per acre. If the base fertilizer and seed fertilizer are more abundant and the soil is very fertile, one can top-dressing and combine the second weeding for deep fertilization.