On May 21st, when the sun reached the 60 ° of Huangjing, it entered the small full-year solar season, which means that the grains of the summer harvest crop began to be grouted, but it was not mature yet, so it was called Xiaoman.
At this time, from the point of view of the climate, temperatures in northern China can reach 23°C~25°C, and high temperature weather above 30°C~35°C is beginning to appear in the middle and lower reaches of the Yellow River south of the Yellow River. After the small years, the country gradually entered the summer, the temperature difference between the north and the south further narrowed, and the precipitation increased significantly. Therefore, in some areas, “Little Full†was given a new symbol to describe the surplus and deficiency of rainwater. If the fields were not full when the land was full, it would be It may cause cracks in the field and the failure to plant rice. However, in the land reclamation, there is a saying that “Little Manchu is planting grasshoppers†and “Run to the Little Man Gu Benqiu†indicates that Xiaomang is a suitable season for planting rice.
During the small hours, we must pay attention to the planting of rice in central and southern China. Regarding the principle of fertilizing rice in the field, in general, phosphate fertilizer is often applied as a base fertilizer and a seed fertilizer. Potassium fertilizer can be applied as base fertilizer, but in sandy soil or super high-yield cultivation, potassium fertilizer should be sub-fertilized with base fertilizer and top dressing. The technology of nitrogen fertilizer application is relatively complex and can be divided into 3 kinds of situations: For double-season rice, due to the short growth period, soon after transplanting, it enters the tillering stage, and at the same time, it begins to differentiate into panicles and enters the stage of tillering during panicle differentiation. Therefore, after 2 to 3 weeks after transplanting, the peak of sucking fertilizer is formed. For this purpose, the tillering fertilizer should be applied in a timely manner. Generally, 40% of the total nitrogen fertilizer is applied, and the other 60% of nitrogen fertilizer is applied to the base fertilizer before planting. For single-season rice, the growth period is longer, and in addition to the first fattening peak 2 to 3 weeks after transplanting, the second uptake peak must be observed at 7 to 9 weeks. Therefore, it is best to top-dress two crops of single-season rice, applying 20% ​​to 25% of the total nitrogen for the first time, and applying 25% to 30% of the total nitrogen for the second crop. The characteristics of hybrid rice from the tillering stage to the booting stage are the peak stage of uptake. The absorption of nitrogen is slightly more than the tillering stage, and there are also more nitrogen, phosphorus and potassium absorption from full panicle to mature stage, accounting for 20% of total nitrogen. 30%. Therefore, topdressing should also be carried out in batches. Before and after the heading, the second topdressing should be performed at the time of seedling growth and application of nitrogen fertilizer and potassium fertilizer so that the plant maintains a high level of nitrogen and potassium nutrition in the later period of fertility, so as to improve the seed setting rate and the 1000-grain weight.
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