The scientific top dressing method of corn and rice

The fertilizer requirement of maize is 2% of the total fertilizer requirement in the seedling stage, 85% in the spike stage, and 13% in the grain stage. According to the survey, for every 100 kilograms of maize produced, 2.5 kg of nitrogen, 0.9 kg of phosphorus, and 2.2 kg of potassium are required. The peak period of corn demanding fertilizer is the period of jointing to Dagu, which is usually followed by the second fertilizer application. The first time it is jointed At the beginning, Mu recovers 10 kg of urea, or 15 kg of ammonium nitrate, and recovers the second fertilizer 7-10 days before tasseling, and recovers 12 kg of urea or 17 kg of ammonium nitrate per mu. If the content of soil organic matter is high, the base fertilizer and the seed fertilizer are sufficient. ,Maize growth is good, chase once a fertilizer is also available, top dressing method combined with shoveling twice, can also be used fertilizer, or with grind shark hole (埯) chase, but the top dressing depth must be more than 10 cm, so as to increase fertilizer utilization rate. Rice is a fertilizer that requires more nitrogen. Generally, for every 100 kilograms of rice produced, it requires about 2 kilograms of nitrogen. The absorption of nitrogen begins to increase gradually after returning green. The peak period of tillering reaches the peak of demand fertility to promote early growth. Fast-acting, improve effective delivery, should be applied early to re-apply manure, promote delivery. The principle of rice top-dressing is to eat less and more meals, that is, topdressing tiller fertilizer and ear-grain fertilizer. The topdressing time for tiller fertilizer is 7-10 days after transplanting, 230 kg of ammonium sulfate is applied per hectare, and 8-10 before heading. At the leaf stage, young panicles begin to differentiate and begin to top-dress panicle fertilizer. Panicle fertilizer can be applied in two separate applications. When the first 3 leaves have just been exposed, the total amount of panicle fertilizer is about 60%, promoting the panicle and branch stalks. One number of spikelets differentiated to increase the number of primary branches and strive for large spikes; the second application of the remaining panicle fertilizer was at the tip of the flag leaf; potassium dihydrogen phosphate could also be sprayed at later stages to increase maturity and 1000-grain weight.

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