How to choose the best topdressing period

The best topdressing period of rice: the absorption of nitrogen fertilizer by rice is gradually increased from the time of greening, and the highest peak of fertilizer absorption is reached at the peak of tillering. In order to promote early rice and early tillering, early application and heavy application of manure should be applied. 7 generally after transplanting --10 days, 10 kg of urea fertilizer per acre, urea topdressing again when heading 15--20 kg.

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 per acre topdressing; 7 before tasseling --10 days topdressing second fertilizer per acre re topdressing 20 kg of urea. 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.

Best dressing of sorghum: sorghum from nutrients to meet the needs of the jointing to heading, at the time of dressing should first jointing, topdressing urea per acre 8--12 kg; second dressing at booting again, per acre topdressing 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 collateral plants occurs, it should be 1 topdressing nitrogen per acre topdressing urea 5--10 kg. 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. Dressing but also during the growth stage, generally once flowering topdressing nitrogen at the beginning of soybean, which can reduce the rate of pods off the flowers, and to extend the life of the plant, seed weight, increase production. General acre topdressing urea 8--12 kg. 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.

Best dressing of potatoes: potato generally carried out in dressing before flowering, early maturing varieties dressing is preferably in the seedling stage, the late bud before the dressing is preferably varieties, and 10 kg of urea per acre topdressing potassium 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.