The absorption of nitrogen fertilizer by rice began to increase gradually after turning green, and reached the highest peak of fertilizer absorption during the peak of tillering. In order to promote the early emergence of rice, early delivery, early application and re-appropriate sub-fertilizer. Generally 7 days to 10 days after transplanting. Urea urea fertilizer 10 kg per mu, heading and then topdressing urea 15 kg -20 kg.
Under the principle of balanced fertilization, maize is the peak period of nutrient absorption after jointing until the big bell-mouth period. Generally, the first fertilizer can be applied before and after jointing. Per acre topdressing 10 kg of urea; 7 days -10 days before tassels, should apply the second fertilizer, 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, one can top-dressing and combine the second weeding for deep fertilization.
From the jointing stage to the heading stage, the sorghum needs high nutrients, and it is necessary to chase the first fertilizer at the jointing stage, and apply 8 kg to 12 kg of urea per acre. After the second stage of the panicle picking flag, the second fertilizer will be applied. kilogram.
The nutritional critical period of peanuts is in the pre-birth period. About 15 days after the emergence of peanuts, flower buds began to differentiate a lot and nodules began to form. When two pairs of lateral branches appear in the plant, nitrogen fertilizer should be applied in a timely manner, and topdressing urea from 5 kg to 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 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, urea can be topdressed with 8 kg-12 kg 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.
Potatoes can generally be topdressed before flowering. Early maturing varieties are suitable for dressing at the seedling stage, while mid-late maturing varieties are better chased before budding, with 10 kg of urea and 5-10 kg of potassium sulfate per mu, which can not only increase production, but also improve quality.
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