Case: It is the season when the summer corn needs to be top-dressed. Comparing the summer corn with the spring corn, it has two major characteristics: First, the growth period is short, usually about 100 days, and the seedling growth is in the high temperature and rainy season; second, the summer corn planting method is the winter wheat-summer corn rotation system. In some areas, such as northern Jiangsu Province, the corn is interplanted before the wheat is harvested, and most of the northern China is directly sowing the summer corn after harvesting. The common feature of the above two types of areas is that no basal fertilizer can be applied before sowing summer corn. Therefore, the method of fertilizing summer maize depends on top dressing during growth. This introduces the fertilization experience of a specialized planting household in Wuqiang County, Hebei Province. The specific approach is to apply the first time to the Miaofei after the emergence of the summer corn to the 4-leaf stage. He uses a high-nitrogen compound fertilizer (25 ~ 10 ~ 15), the amount of fertilizer is 15 kg / mu, fertilization method is to open the trench fertilization and then reconstituted soil. Wait until the maize seedling grows to the trumpet period and timely second fertilizer, Mushi 20 kg urea, urea application method is to use hole fertilizer after the buried, and then irrigation. In the past two years, the average yield of summer corn planted at his home was more than 900 pounds, and some of them reached a staggering level.
Expert Comment: For the scientific nature of this timely corn fertilizer application, agricultural expert Cao Yiping commented.
This case shows that according to the characteristics of the nutritional requirements of summer maize, it is reasonable to determine the period of fertilization, the amount of fertilization, and the method of fertilization, so the effect obtained is obvious. 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.
From the perspective of fertilization technology, this case is worth emulating the following three points: First, the timing of topdressing is quasi-accurate, reflecting the characteristics of early application of corn and topdressing in the following manner; secondly, it is reflected in the types of fertilization. The balanced application of N, P and K nutrients also highlighted the characteristics of nitrogen fertilizers. The first topdressing fertilizer was dominated by nitrogen and phosphorus and potash fertilizers. The second time the top dressing was focused on nitrogen fertilizers; Topdressing high nitrogen compound fertilizer and urea. The annual yield of summer corn obtained is in the range of 450-500 kg/mu. This amount of fertilizer is economically and reasonably applied.
Whether the first application of compound fertilizer or the second topdressing of urea, can be used to open trenches or digging holes, and then apply fertilizer after the application of fertilizer. This not only reduces the volatilization loss of nitrogen fertilizer, but also makes the phosphorus fertilizer close to the root system to improve the absorption probability, so a higher fertilizer utilization rate is obtained.
A seedbed or seedling bed is the local soil environment in which seeds are planted. Often it comprises not only the soil but also a specially prepared cold frame, hotbed or raised bed used to grow the seedlings in a controlled environment into larger young plants before transplanting them into a garden or field. A seedling bed is used to increase the number of seeds that germinate.
Greenhouse Seedling Bed,Stainless Greenhouse Seedling Bed,Greenhouse Seedling Nursery Bed
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