Experts from the National Wheat Industry Technology System Field conducted field surveys and surveys on some provinces and cities in the northern winter wheat region. Wang Zhimin, a professor at the Agricultural College of China Agricultural University, said that it is expected that freezing damage to the aerial parts of the northern wheat fields in winter will be very common and heavier. long.
Miaoqing and lyricism
The wheat in the main producing areas in the north is mostly suitable or adequate before sowing, and after several times of rainfall after emergence, the soil moisture content generally continues to be good, which is conducive to emergence and seedling growth. According to the remote sensing monitoring results of soil moisture, most of the soils in the northern wheat region have proper moisture conditions, and the suitable proportion of soil moisture is 98%. In general, the characteristics of the current Miao region in the northern wheat region are: the population is suitable or relatively large, the proportion of individuals with propensity to prosperous (tenner) is relatively high, and the average seedling quality is relatively poor. According to more surveys and summaries by experts, the ratio of partial seedlings accounted for about 5% to 10%. About one seedling accounted for about 30%, the second seedling accounted for about 40%, and the third seedling accounted for about 20%. The reason for poor seedling quality is mainly due to the large population, high temperature, and low sunshine. Wheat seedlings grow faster, sowing seedlings are more prosperous, and seedlings are weaker in late seeding. Dryland wheat showed better overall puberty and seedling conditions than usual.
Henan Yuzhongnanteng early, sowing date is basically the same as in previous years sowing date, and the early rainfall and good moisture, a large proportion of prosperous seedlings; the evening of the Yellow River lags in the evening, then it rains, resulting in varying degrees of late sowing. The sowing date of Hebei wheat-yushu two-mature wheat field was mostly from October 5 to October 20, and the sowing date of cotton buckwheat was from October 22 to November 15 in the same year. The current seedling age was also significantly different, but the general population was larger. . The sowing date of the main grain fields in Shandong is relatively concentrated, the sowing date is appropriate, the groups are sufficient, the overall seedling condition is good, and the proportion of the first and second seedlings may be relatively high. The proper sowing of wheat in dryland in Shanxi Province was also due to high rainfall and high temperatures, and there was a prolonged trend. In some dryland wheat and mulch-covered wheat, due to large sowing and insufficient illumination, leaf sheaths were elongated, and the leaves were slender and yellow-green in color. Up to 30-40 centimeters of the plant is the “pseudo-wang seedlingsâ€; due to the late-maturing of late-summer sowing crops in wetland and dry land, the sowing date is generally delayed by 10 to 15 days, and the individuals are currently small. Shaanxi's Miaoqing is also showing a weak tendency of magnified by both rain and sunshine. According to the understanding of the situation in Xianyang, Baoji, Weinan, and Tongchuan, the seeding conditions in the drylands were earlier. The first and second types of seedlings were up to 80%, but the proportion of Wangmiao and Liaowang seedlings also reached more than 15%. The water sowing period is relatively late, and the quality of wet sowing is poor. The basic seedlings are between 180,000 and 320,000 per mu, with an average of 264,000 per mu. The main stems are mostly between 3.2 and 4.5 years old, and the average per plant is 1.2 tillers. There are 30 % of the individual plants have no tillers and the total number of stems is between 280,000 and 630 thousand per mu.
Overwintering seedlings forecast
Freezing damage to above-ground leaves of wheat in the northern winter wheat field will be very common and heavier. The main reason is that the current seedlings are mostly greenish and weak, and some are prosperous. In most areas, the wheat seedlings have not been used for cryogenic exercise. At the end of November of the same year, it is facing a substantial cooling, most areas will enter the wintering period in advance, and the blades will be suddenly frozen. However, due to better soil moisture, the freezing injury in winter may only be related to the leaves and will not affect the tiller section. In addition to individual serious growth, poor planting, or unfit wheat, it is not expected to cause a large area of ​​dead seedlings.
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