From September 19 to 21, most areas of our province had small to moderate rains, and some parts of central and southern China had heavy rain. Some misunderstood that this rainfall provided an opportunity for looting wheat. Therefore, I would like to remind farmers brothers and sisters that they must be sowed in due course and do not sow wheat ahead of time for robberies. Each crop has a suitable sowing time. As a multi-year growing crop, wheat requires stricter sowing time, because sowing is too early, the accumulated temperature is too high, prone to seedling prolongation before winter, and even spike differentiation occurs; sowing is late, accumulated temperature is insufficient, and the pre-winter group is small. These are not conducive to the formation of strong seeds before the winter, it is difficult to achieve high yields of wheat. For this reason, the farmer brothers have concluded in the long-term work that the suitable sowing period for wheat in the central and southern regions of the province is “the white dew is early, the cold dew is late, and the autumn decent is seededâ€. However, with the objective factors such as the improvement of production conditions, the improvement of the management level of farmers' brothers, the warming of the winter climate, the reform of the farming system, and the promotion of some high-yield products, the experienced farmers also proposed the "equinoxes early, frost delays, and cold dew exposures. Mak was at the time." In fact, the most scientific method for determining the appropriate sowing date of wheat is based on the accumulated temperature above 0°C required for the development of strong seedlings before winter. Production proves that the accumulated temperature above 0°C in wheat before it develops into a strong seedling requires 500-600°C. According to the accumulative temperature index, the general year, the South-Central region needs to be sown in early October. At present, most of the production promotion is high-yielding wheat varieties, while the high-yielding wheat varieties suitable for the Zhongnannan ecological area are generally semi-winter and weak winter varieties. These varieties have the characteristics of medium tillering ability, high spike success rate, many spikelets, and high grain weight. They are loved by farmers and brothers, but they are sensitive to temperature at the seedling stage and are planted too early. Not only are they prosperous, but they also cause Freezing damage. This spring, some wheat fields suffered cold damage, which was caused by the early planting of wheat last fall. According to experiments, semi-winter or weak winter wheat was sown in late September in Shijiazhuang. Because the wheat seedlings grew too profusely, the growth of wheat ears before winter was more prone to frost damage than the elongated stems, and the faster the ear differentiation was, the heavier the damage was. The seeds planted in the middle and early October were safely wintered. Of course, there is an annual climate that affects the growth of wheat before winter. In winter and warm winter, wheat should be sown late; in the cold winter, wheat should be sown early. However, the climate during the inter-annual period is changeable. In order to increase the insurance factor for the formation of strong seedlings and safe wintering before winter wheat, the experts suggested that the suitable sowing period for wheat in October and August in the Zhongnannan Wheat Region. If you want to catch the rain this time, sowing seeds in September, then this year will be hidden in the winter wheat, cold hazards hidden. In order to eliminate these hidden dangers, when we plant wheat this fall, we must change the unscientific practice of sowing and grabbing early sowing in the vacated land. We must do so in accordance with the requirements for the cultivation of high-yielding wheat.
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