How to choose the best topdressing period
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The best topdressing period of corn: Under the principle of balanced fertilization, corn is the peak period of nutrient absorption after jointing to large bell mouth. Generally, the first fertilizer can be applied before and after jointing. 10 kg of urea should be applied per acre; in the 7-10 days before the tasseling, the second fertilizer should be applied, and 20 kg of urea can be applied per acre. 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.
The best topdressing period of sorghum: in order to meet the nutrient requirements of sorghum from jointing to heading, the first topdressing should be applied at jointing, and 8-12 kg of urea should be applied per mu; the second topdressing at the booting stage, per acre Urea 10 kg.
The best topdressing period of peanut: the nutrient critical period of peanut is in the early stage of fertility, and about 15 days after emergence of peanut, the flower bud begins to differentiate and the nodule begins to form. When two pairs of side branches appear in the plant, the nitrogen fertilizer should be applied once in time, and 5-10 kg of urea per mu should be applied. Peanuts combined with soil after flowering and spraying multiple micro-fertilizers are beneficial to reduce the rate of empty fruits and increase the yield and quality of peanuts.
The best topdressing period for soybeans: Soybeans are crops that require more nitrogen, but they have rhizobial nitrogen fixation that can solve some of the nitrogen sources. However, during the growth period, the fertilizer should be applied in stages. Usually, the nitrogen fertilizer is applied once in the early flowering stage of soybean, which can reduce the rate of flowering and falling, and can prolong the life of the plant, increase the grain weight and increase the yield. Generally, 8-12 kg of urea can be applied per acre. In the pod-forming period of soybean, one extra-root top dressing can be carried out, that is, the multi-micro-fertilizer is sprayed on the foliar surface, and the yield increasing effect is more obvious.
The best topdressing period of potato: Generally, the top dressing can be carried out before the flowering stage of the potato, and the early maturing variety is suitable for topdressing in the seedling stage. The middle and late ripening varieties are better applied before the bud, and the urea is applied 10 kg per kilomu and potassium sulfate 5― 10 kg, not only can increase production, but also improve its quality.
A variety of crops should be rationally fertilized under the principle of balanced fertilization; crops have the best topdressing period, when the topdressing effect is the best; topdressing is only an important part of the fertilization program, and the base fertilizer can not be ignored.