Grasp the best topdressing period of crops
Corn maize is the peak period of nutrient absorption after jointing to trumpet. Generally, the first fertilizer can be applied before and after jointing. 150 kg of ammonium nitrate or 120 kg of urea can be applied per hectare ; 7 to 10 days before the tasseling The second fertilizer should be applied, and 225 kg of ammonium nitrate or 180 kg of urea can be recovered per hectare . 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.
Sorghum Sorghum order to meet the required nutrients jointing to heading, at the time of jointing topdressing first fertilizer, ammonium nitrate per hectare topdressing 150-225 kg or 120 to 180 kg of urea; the booting again flagging second topdressing Secondary fertilizer, 120 kg of ammonium nitrate per hectare or 75 kg of urea .
Nitrogen Absorption of Rice is gradually increased from the turning green, tillering to reach the peak absorption of fat. In order to promote early tillering of rice, early application and heavy application of manure should be applied. Generally , 225 kg of ammonium sulfate can be applied per hectare 7 to 10 days after transplanting , and 100 kg of urea should be applied at the time of heading .
Wheat and wheat should be topdressed at the three-leaf stage, usually 195 to 270 kg of ammonium nitrate or 135 to 180 kg of urea per hectare . In the later stage of wheat, due to the weakening of nutrient uptake by roots from the soil, a top dressing should be carried out at the heading and flowering stage. 2,250 g of potassium dihydrogen phosphate per hectare , 22.5 ml of triacontanol solution and 300 kg of water are mixed. Spray; it is also possible to use 3000 g of potassium dihydrogen phosphate per hectare , add 15 kg of urea , and spray 450 kg of water .
Soybean soybean is a crop that requires more nitrogen fertilizer. Usually, nitrogen fertilizer is applied once during the initial flowering period 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, 150 to 225 kg of ammonium nitrate or 120 to 180 kg of urea can be applied per hectare ; in the period of soybean pod formation, a top dressing can be carried out, and the effect of increasing yield is more obvious.
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