Summer corn high-yield science fertilization first

It is also the season of summer corn topdressing. Summer maize is difficult to plow the base fertilizer because of sowing time, which has an important impact on its high yield. With this question, a reporter recently interviewed Yang Yinfu, a researcher at the Corn Research Institute of the Northwest A&F University. He reminded corn growers to go out of the fertilization misunderstanding and scientifically and rationally fertilize.

Establish a scientific concept of fertilization

At present, many farmers still have misunderstandings in corn topdressing, and the general topdressing is too late. Yang Yinfu pointed out that farmers are accustomed to topdressing before and after tasseling, but they do not know that they have missed the best time. A shelling type of topdressing, when planting all the fertilizers as a fertilizer once applied, or when pouring the head water, all the fertilizer is sprinkled. At the same time, some farmers have the concept of looking for fattening, regardless of the characteristics of corn growth, only after raining and then topdressing, these will affect the increase in corn production.

Yang Yinfu said that if it is not fertilized at the time of sowing or before sowing, it can be supplemented by topdressing at the seedling stage (4 leaves). If the straw is returned to the field, urea should be added to accelerate the straw rot. When the corn is tied to the big bell mouth period, the time and dosage of top dressing should be determined by the seedling stage and the soil force. If the seedlings are weak and thin, the application can be applied early and applied more. Note that zinc fertilizer and phosphate fertilizer should be applied separately.

Fertilize according to local conditions

First, we should understand the rules of corn for fertilizer. The corn seedling stage is a critical period for phosphorus and potassium fertilizer. The absorption of potassium by corn is absorbed by about 50% during the heading pollination period, and all the potassium has been absorbed by the peak filling stage. The absorption of phosphorus by maize is basically the same as that of nitrogen. The jointing of the ear to the peak of the tassel is slowed down after pollination. The large trumpet period before the tassel is the critical period for nitrogen fertilizer.

Secondly, the determination of the amount of fertilizer should be based on the production of fertilizer, specifically: the general yield of 700 kg of land should be applied to 35 kg of urea, 15 kg of diamine, 20 kg of potassium sulfate. For plots with a yield of more than 800 kilograms per mu, it is necessary to increase the application of farmyard manure and zinc fertilizer, borax and other micro-fertilizers.

Finally, during the fertilization period and method, all the phosphorus and potassium fertilizers, about 20% of the nitrogen fertilizer and the zinc fertilizer should be applied as the base fertilizer (fertilizer) at one time. The rational application of the base fertilizer (fertilizer) can increase the yield by about 15%. In the big bell period (1~1.5 m high), the nitrogen fertilizer should be applied, about 60% of the total nitrogen fertilizer should be applied. It is best to apply 20% nitrogen fertilizer after the tasseling. It is best to apply or ditch the strip at a distance of 10~15 cm from the corn root. Do not apply it. When it is fertilized, it should be combined with watering.

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