When is the best sowing time for wheat?

When is the best time to sow wheat? This is a concern of many farmers. There is an ancient proverb in China, "The white dew is early, the cold dew is late, and the autumnal equinox is the time to plant wheat". As we all know, the autumnal equinox falls on September 23rd every year, with the white dew 15 days earlier, that is, September 5th, and the cold dew 15 days later, that is, from June 7th to 8th. The ancients thought that it was most suitable to sow wheat around September 23. So is this time period still suitable for modern wheat sowing? The author consulted a large number of documents and combined with the current practical work, thinking that this proverb is not suitable for guiding the current wheat sowing.

Taking the northern winter wheat area as an example, the best sowing date of wheat should be postponed until after the National Day. The main reasons are as follows.

First of all, the varieties of wheat have made great progress. Compared with before, the resistance and high yield of current wheat varieties have been greatly improved.

The increase of the second temperature leads to the obvious increase of the accumulated temperature before winter. The accumulated temperature before winter affects the growth and development of wheat before winter. If the seeds are sown too early, the wheat will thrive before winter comes. It is very unfavorable to the cold resistance during the wintering period. As the saying goes, wheat grows too vigorously before winter, which will inevitably lead to spring and the recovery of growth is relatively slow. From this point of view, the sowing date of wheat should be postponed appropriately.

The third is that the sowing level and sowing technology have been greatly improved. At present, mechanized sowing is mainly used, which can control sowing density, row spacing and plant spacing. Then under the previous conditions, it is difficult to ensure the density and uniformity of sowing by artificial sowing, so in order to obtain enough population, it is necessary to sow early and increase the number of tillers of individuals.

The fourth is to consider the total output of wheat and corn. Zaiyu

Appropriate late harvest in rice harvest period can increase corn yield. In a certain range, the yield of wheat will not decrease obviously with the delay of sowing date, so it is necessary to find a reasonable balance point. Taking the northern winter wheat area as an example, the best balance point is around the National Day every year. Further south, the accumulated temperature will be higher and higher before winter, and the sowing date will be postponed accordingly. For example, the sowing date of southern wheat in Huanghuaihai wheat area is about 10+05.