In the season when summer corn was top-dressed, the author found that many farmers still have misunderstandings in corn dressing. The concrete manifestations are:

1, catch fertilizer too late. Farmers are accustomed to top dressing before and after tasseling. They do not know that they have missed the best time.

2, a shelling fertilizer. When sowing, all the fertilizer is applied as a fertilizer, or all the fertilizer is sprinkled when the head water is poured.

3, Wang Tianfei. Regardless of the characteristics of corn growth, wait until it rains and then top up. In the above three cases, it is difficult for corn to obtain high yields.

To achieve high yields of corn, first of all, we should understand the law of fertilizer requirements of corn: maize seedling stage is the key period of phosphorus and potash fertilizer, and the big bell-mouth period before tasseling is the critical period for nitrogen fertilizer. Secondly, the determination of fertilizing amount should be based on the production of fertilizers. In general, a plot of 700 kg of land should be applied with 35 kg of urea, 15 kg of diamine, 20 kg of potassium sulfate, and more than 800 kg of land per mu. Farmyard fertilizers and zinc sulfate, borax and other trace fertilizers. Finally, during the fertilization period and method, all phosphorus, potash, and about 20% of nitrogen and zinc fertilizers should be used as base fertilizer (seed-fertilizer) at seedling stage. Studies have shown that: rational application of basal fertilizer (seed fertilizer) can increase production by about 15%. During the big bell-mouth period (1-1.5 meters high), nitrogen fertilizer should be re-applied, and about 60% of the total amount of nitrogen fertilizer should be applied. After the tasselling, 20% of nitrogen fertilizer should be applied. In the 10-15 cm from the roots of corn, application of a hole or ditch is the best, do not spread, combined with watering in case of drought and fertilization.

After applying good fertilizer, integrated management can not be ignored. According to the growth conditions of the fields, drought and watering, integrated pest control, timely and late harvest can get the final high yield.

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