Agricultural proverb "August cold dew is a disaster year, September cold dew bodes well for a good year", why? When is the cold dew this year?

Cold dew, the17th of the 24 solar terms, is a solar term reflecting the characteristics of climate change.

The temperature difference in the cold dew season is large, and the temperature drop in the northern region is obvious, with little rain and dryness, and the cold is getting stronger. Snowfall has occurred in some areas such as the northeast and northwest. In the south, the temperature is also falling, and you will feel a little cold sooner or later.

According to the solar calendar, the time of cold dew is relatively fixed in the three days of 65438+1October 7, 65438+1October 8 and 65438+1October 9 every year.

According to the lunar calendar, influenced by leap years and ancient calendars, the time is relatively uncertain, some years are in August and some years are in September.

In order to accurately judge the specific time of lunar calendar and solar calendar of cold dew every year, it depends on the time when the sun arrives at 195 longitude. Twenty-four solar terms are judged according to the time when the sun reaches different longitudes. Each solar term corresponds to one degree, and the cold dew corresponds to 195.

The specific time of cold dew this year (2022) is10,08, 15: 22, corresponding to the lunar calendar time of September 13.

Let's look at the cold dew time of 202 1. The Gregorian calendar is 65438+10.8, and the corresponding lunar calendar is the third day of September.

The cold dew time in 2020 is 65438+10.8 in the solar calendar, and the corresponding lunar calendar time is August 22.

The cold dew time of 20 18 is1010.8, and the lunar calendar is August 29.

As can be seen from the above example, the lunar calendar time of the cold dew solar terms changes greatly, some years are indeed in August, and some years are in September.

Because of this difference, there are still some proverbs circulating among the people, such as "August cold dew is a disaster year, September cold dew is a bumper year."

Literally speaking, if the cold dew solar term is in August, then that year is a disaster year. On the contrary, if the cold dew solar term is in September, then that year is a bumper harvest year.

Some friends will ask, why do you say that? Is there any basis? The following content, the assistant will give you a detailed explanation.

The proverb "August cold dew is a disaster year, September cold dew indicates a bumper year" is mainly from the perspective of agricultural planting.

Cold dew is a very important solar term in agriculture, especially in the northern region where wheat is grown. There is a saying that "the autumnal equinox is early, the first frost is late, and the cold dew planting wheat is just then", which means that the cold dew season is the peak season for planting wheat, and it is not conducive to the growth of wheat too early or too late.

In addition, many farmers don't watch the cold dew (or the time of the solar calendar), and the autumn harvest and autumn sowing will be decided according to the time of the lunar calendar.

As mentioned above, after the cold dew, the temperature dropped significantly and there was already a chill. If the solar term is in the eighth month of the lunar calendar, for some farmers, the crops in the field have not been harvested. In general, autumn sowing or autumn sowing has been completed.

Delaying the autumn harvest will inevitably affect the sowing time of the next crop of wheat. In addition, the previous harvesting was manual and took a long time. By the time the autumn harvest is over and the wheat is sown again, it may be time for the first frost.

However, during the first frost, the temperature is lower. At this time, when sowing wheat, due to the influence of temperature, the emergence rate of wheat will decrease, while for wheat that can emerge, the seedlings will be weakly yellowed due to low temperature.

At the same time, there was no foliar fertilizer and plant growth regulator before. Wheat seedlings are weak in Huang Shi, and farmers have no good remedial measures, so they can only accept the situation of reducing production in the following year. This is the relevant explanation that "the cold dew in August is a disaster year".

If the cold dew falls in the ninth month of the lunar calendar, it is already the time for farmers to sow wheat, regardless of the solar calendar or the lunar calendar. Sowing is completed in the cold dew period, and wheat has emerged before the cooling comes.

Wheat is a kind of crop with strong cold resistance. After normal emergence, as long as it does not encounter extreme low temperature weather, it will not be greatly affected and it can overwinter safely on its own.

When everything is normal, the crops will be harvested.

Therefore, the cold dew solar term is in September of the lunar calendar, which is a normal time period for most growers, and the farming season in the field also follows the solar term.

This is the relevant explanation of "the cold dew in September bodes well for the harvest year".

This year (2022), the solar term of cold dew falls in September of the lunar calendar, hoping to fulfill the saying that "September is a good year for cold dew". What do you think of this?