Reasonable selection of sowing time for wheat

The suitable sowing time for @ # @ 245 winter @ generally means that it is appropriate to sow seeds when the average temperature of day and night drops steadily to 18-15 ℃ in autumn. Within this range, semi-winter varieties are sown first, and spring varieties are sown later. The natural conditions such as suitable temperature and light in autumn and winter can be used to form strong seedlings before winter, which is beneficial to safely overwintering and improve the panicle rate of tillers and grain weight. It is now a critical time for wheat sowing, and wheat has been sown from north to south in the province. According to the sowing time requirements of different regions and different types of wheat varieties, and aiming at the problem of wheat sowing at the right time, which is generally concerned by farmers, the following suggestions are put forward:

1. Select suitable wheat varieties according to different regions and stubble.

1. In Huaibei region, early crops such as soybean, sesame, corn and other early crops have been harvested in mid-late September, mainly semi-winter varieties in the selection of autumn wheat varieties, and appropriately increase the proportion of weak winter varieties, in order to make full use of the good soil moisture and light and heat resources of early stubble to achieve early sowing and high yield. For potato, cotton and other plots that are too late to stubble, choose spring varieties to plant.

2. Semi-winter or spring varieties can be planted according to the morning and evening of stubble in the central and southern part of Huaibei and along the Huaihe River. Due to the better climatic conditions this year, the planting area of semi-winter varieties can be increased appropriately.

3. There are mainly spring varieties in Jianghuai region.

Second, arrange the appropriate sowing time according to the type of variety. Different types of varieties have different requirements for suitable sowing time. Among them, the weak winter varieties can be advanced to the end of September, and the suitable sowing date of semi-winter varieties is the first and middle of October. The spring variety was postponed from late October to early November. High-yield cultivation generally requires early sowing within the suitable sowing date, but some spring varieties with good comprehensive characters but poor frost resistance, such as Zhengmai 9023 and Wanmai 33, should pay special attention to prevent early sowing.

Third, supporting cultivation techniques. For the areas of early stubble in Huaibei, wheat precision, semi-precision sowing technology and nitrogen fertilizer backward technology can be popularized. Precision and semi-precision sowing can promote the effective tillering of wheat before overwintering, forming multi-spike and large spike, and "nitrogen fertilizer moving backward" can increase protein content and improve wheat quality. Along the Huaihe River and Jianghuai areas, emphasis should be placed on popularizing the techniques of strip sowing cultivation of rice stubble and wheat shallow rotary tiller, integrated control of diseases and insect pests and balanced fertilization, so as to strive for the season when the stubble is tight, ensure timely sowing and seedling emergence, and improve yield and quality.