Experts: Compared with spring corn, summer corn has two major characteristics. First, the growth period is short, usually about 100 days, and the seedling growth is in high temperature and rainy season. Second, the cropping pattern is the winter wheat-summer corn cropping system. For example, the northern Jiangsu region interplants the corn before harvesting. In most parts of northern China, the summer maize is directly planted after the wheat is harvested; the common characteristics of the above two types of regions. It is impossible to apply base fertilizer before sowing summer corn. Therefore, the method of fertilizing summer maize depends on top dressing during growth.
This case shows that according to the characteristics of the nutritional requirements of summer maize, it is reasonable to determine the fertilization period, the amount of fertilization, and the method of fertilization, so the obtained results are obviously better. Not only harvested higher production that year, but also reached the goal of high yield and stable production. According to the amount of fertilizer applied in this case and the actual harvest yield of summer corn, it can be seen that the utilization rate of the fertilizer is high, especially the utilization rate of nitrogen fertilizer is relatively high, if it is analyzed from the perspective of fertilizer technology. The following points in this case are worth emulating:
1. The timing of topdressing is quasi-accurate and reflects the characteristics of early application of corn and topdressing.
2. The application of N, P, and K nutrients in the fertilization type reflects the characteristics of nitrogen fertilizer. The first topdressing was dominated by nitrogen with phosphorus and potassium fertilizers, and the second top dressing was mainly nitrogen and potassium fertilizers.
3. In the grasp of the amount of fertilizer, the secondary fertilizer was applied with high nitrogen compound fertilizer and urea and potassium chloride. The annual yield of summer corn obtained is in the range of 500-600 kg/mu. This amount of fertilizer is economically and rationally applied.
4. Appropriate fertilization method. Regardless of whether the first application of compound fertilizer or the second application of urea and potassium chloride, the method of application of trenching or digging, and then re-watering after fertilization is applied. This not only reduces the volatilization loss of nitrogen fertilizer, but also makes the phosphorus fertilizer close to the root system to increase the probability of absorption, so a higher fertilizer utilization rate is obtained.
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