Entering the small full festival, the meaning is that the grain of the summer harvest crop begins to grout, but it is not yet mature, so it is called Xiaoman.
After the Xiaoman, the whole country gradually entered the summer, the temperature difference between the north and the south further narrowed, and the precipitation increased significantly. If the field is not full of water when it is small, it may cause the field to crack and cannot transplant rice. In the farms, there is a saying that “small full is being planted†and “small and full of valleys are running in autumnâ€, which indicates that Xiaoman is suitable for the season of rice planting, and it is necessary to grasp the planting of Yongdao in the central and southern parts of China.
Principles of Rice Honda Fertilization:
1. Phosphate fertilizer is often used as a base fertilizer and a layered fertilizer.
2. Potassium fertilizer can be applied as base fertilizer, but in sandy soil or super high-yield cultivation, potassium fertilizer should be divided into base fertilizer and top dressing.
3. The technology of nitrogen fertilizer application is more complicated and can be divided into three kinds of cases: for double-season rice, due to the short growth period, it will enter the tillering stage soon after transplanting, and start panicle differentiation, and enter the tillering stage during panicle differentiation. In the period, 2-3 weeks after transplanting, the peak of absorption is formed. Therefore, it is necessary to apply the tiller fertilizer in time, generally 40% of the full-time nitrogen fertilizer, and the other 60% of the nitrogen fertilizer is applied to the base fertilizer before planting. For single-season rice, the growth period is longer, except for the first peak of absorption after 2-3 weeks after transplanting, and the second peak of absorption will occur by 7-9 weeks. Therefore, the single-season rice is best to be topdressed twice, the first time to apply 20% - 25% of all nitrogen, and the second time to apply 25% - 30% of all nitrogen. The characteristics of hybrid rice are the peak of the fertilizer absorption from tillering to booting stage. The absorption of nitrogen is slightly more than that of the tillering stage, and there is also more absorption of NPK in the head-to-mature stage, accounting for 20% of all nitrogen. 30%. Therefore, the topdressing should also be carried out in different stages. The second top dressing is carried out before and after heading. At this time, it is necessary to see the seedling fertilizer of Miao Zeng application, and the grain fertilizer should generally apply nitrogen fertilizer and potassium fertilizer, so that the plant maintains a high nitrogen and potassium nutrient level in the late growth stage, in order to increase the seed setting rate and 1000-grain weight.
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