Why is it said that fields are not cultivated during the autumnal equinox?

This is because the autumnal equinox is a season that represents harvest. After the autumnal equinox, the temperature will gradually drop. After the weather turns cooler, it is not suitable for crop growth. Therefore, you cannot farm after the autumnal equinox. It won't grow again after that.

The autumnal equinox is an important solar term in agricultural production. After the autumnal equinox, the growth period of field crops in the Northeast Plains ends and the harvesting of crops begins. A farmer's proverb says: It's white dew on the night of the autumnal equinox, and it's cold all night long.

In years when the temperature drops early in the Northeast, frost begins at the autumnal equinox. In order to prevent the immature crops from being frosted and reducing their yields, the people organized themselves when the cold wave hit. Each household divided into groups and carried firewood to the fields to watch the night. When the frost was about to fall, they lit fires together. Only dozens of people were seen. The flames soared into the sky for miles or even hundreds of miles, driving away the cold wave. The scene was very spectacular.

Meteorological changes at the autumnal equinox

During the autumnal equinox, my country's Yangtze River Basin and the vast areas north of it have entered autumn, and the daily average temperature has dropped below 22°C. The cold air mass in the north has begun to have a certain influence. The rainy season has just ended in most areas. There is a cool breeze, blue sky, sunny wind and clear autumn air. ?

After the autumnal equinox, the direct sun's position moves to the southern hemisphere. The northern hemisphere receives less and less solar radiation, but the ground loses more heat, and the temperature drops significantly faster.