Summer corn topdressing should be digging or digging
From the winter wheat-summer corn rotation system, the growth period of summer maize is short, about 100 days, and it is generally about 20 days shorter than that of spring corn. The total amount of fertilizer during the whole growth period was less than that of winter wheat, but the time for drawing fertilizer was more concentrated and earlier. During the fertilization period, because the absorption time of N, P and K nutrients in summer maize is earlier than that of spring maize, it reaches the absorption peak at the jointing and booting stage. According to this feature, fertilization should be applied before the peak of fertilizer requirement.
In order to ensure a good harvest of summer corn, topdressing should grasp the principles of “early†and “heavy†before it is expected to obtain high yield and high efficiency. The response of summer maize to phosphorus fertilizer is not as large as that of winter wheat in the rotation, so the principle of applying phosphate fertilizer is to re-apply P fertilizer on winter wheat (about 2/3 of the annual phosphorus application amount), and apply lighter phosphorus fertilizer to summer maize (about the anniversary). Although 1/3 of the amount of phosphorus applied, there is no need to apply more phosphate fertilizer, but the amount of phosphate fertilizer to be precise should highlight an "early application", which is generally applied at the seedling stage. Suitable dosage ranges from 2 to 5 kg/mu phosphorus. After the Miao was injected into the soil, it would be too late to apply phosphate fertilizer after the big bell, and the late application of phosphate fertilizer also affected the yield.
Summer maize and winter wheat rotation, direct harvesting of wheat after harvest, sometimes applying some seed fertilizer at the time of sowing, and top dressing with the principle of “heavy light before lightâ€. The early application of phosphate fertilizer contributed to the yield of summer corn by increasing the grain number and showing a reduction in baldness. The key period for the application of phosphorus in summer corn is from the end of June and the latest should not exceed the first half of July.
In top-dressing operations, 2/3 of the total nitrogen was applied in the jointing period in the past, and the remaining 1/3 was applied to the big bell-mouth period. Phosphorus and potassium fertilizers were generally applied at the seedling stage. Recent studies have shown that due to the live harvesting of summer corn, the base fertilizer is generally not used and the seed fertilizer is not sufficient. Therefore, the top dressing should be applied early. The amount of nitrogen used in the high-yielding field should account for 30% of the total nitrogen application amount. Increase the proportion by 40%. The general trend is to top-dress the corn after the seedlings have been established. All phosphorus, 1/2 potassium, and 1/3 nitrogen are topdressed, and the ditch or digging hole is applied to a depth of 10 cm. To the jointing stage or the big bell-mouth period, apply the remaining 2/3 nitrogen fertilizer and 1/2 potash fertilizer as top dressing.
In the high temperature and rainy season, in order to prevent the volatilization loss of ammonium nitrogen fertilizer and increase the fertilizer utilization rate, the top dressing of summer corn should be ditched or dig fertilized, and cover soil, and do not spread the surface.
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