Be careful not to misunderstand the topdressing of corn

It is the season of summer corn topdressing again, and the author finds that many farmers still have misunderstandings in corn topdressing, which are embodied in:

1. It's too late to get fat. Farmers are used to topdressing before and after heading, but they don't realize that they have missed the best time at this time.

2. One-shot topdressing. When sowing, apply all the fertilizer at once as seed fertilizer, or sprinkle all the fertilizer when watering the head water.

3. Look to the sky and get fat. Regardless of the growth characteristics of corn, it will be fertilized after it rains. In the above three cases, it is difficult for corn to get high yield.

In order to obtain high yield of maize, first of all, we should understand the law of fertilizer demand of maize: the seedling stage of maize is the key period of phosphorus and potassium fertilizer, and the trumpet stage before heading is the key period of nitrogen fertilizer. Secondly, to determine the amount of fertilizer application, fertilizer should be determined on the basis of yield. generally, plots with a yield of 700 kg per mu need to apply 35 kg of urea, 15 kg of diamine, 20 kg of potassium sulfate and more than 800 kg per mu. Farm fertilizer and micro-fertilizers such as zinc sulfate and borax should be applied. Finally, in the period and method of fertilization, all phosphorus, potash, about 20% nitrogen and zinc fertilizer should be applied as base fertilizer (seed fertilizer) at the seedling stage. Studies have shown that the rational application of base fertilizer (seed fertilizer) can increase the yield by about 15%. The heavy application of nitrogen fertilizer in the big trumpet mouth stage (1.5 meters high) should account for about 60% of the total nitrogen fertilizer, and it is best to apply 20% nitrogen fertilizer after heading. In 10-15 cm away from the corn root hole application or ditch strip application effect is the best, do not spread, in case of drought fertilization should be combined with watering.

After applying good fertilizer, the comprehensive management can not be ignored. According to the field growth situation, watering in case of drought, comprehensive control of diseases and insect pests and timely late harvest, the final high yield can be obtained.