What does it mean to cut the grain at the first white dew

White Dew season is the 15th of the 24 solar terms of the year. White dew is a very important festival, is hot and cold a wind and water ridge, so in the white dew, there are a lot of agricultural proverbs and folklore. "The first white dew cut grain, after white dew beat jujube" is about the white dew time harvest a scene, white dew cut grain, after white dew jujube ripe can be beaten down with a stick, and persimmons can not be picked until the frost.

Changes in temperatures during the festival

At the beginning of the White Dew, it means the end of the summer days and goodbye to the fall tigers. After entering the white dew festival, summer winds are gradually replaced by winter winds, cold air south gradually and frequently, coupled with the position of the sun directly above the ground to the south, the northern hemisphere sunshine time becomes shorter, the intensity of sunshine is weakened, the night is often clear and less cloudy, the ground radiation heat dissipation fast, so the temperature drop is also accelerated gradually, there is a "white dew fall equinox night, a night of cool one night". After the white dew, the temperature of day and night will increase. After the white dew, the temperature difference between day and night gradually widened, the daytime afternoon and afternoon temperatures are higher, but the morning and the night has a slight coolness. From the White Dew festival began, according to the climatological division of the four seasons of the standard, everywhere one after another began to enter the fall. At this time, the temperature difference between day and night across China can reach 8 ℃ -16 ℃, so the White Dew is a large temperature difference in the year.

Significance of Agricultural Activities

After the beginning of the White Dew festival, the weather begins to change from hot to cool, and many crops gradually slump and ripen as the cold grows. Therefore, the White Dew world is also a busy time of harvest in our country. In addition to that, one has to take the time to level the land and get ready for planting wheat. After the White Dew Festival, cold air is increasingly active, often low temperature weather, affecting the late rice spike flower. In this regard, it is necessary to take appropriate agronomic measures to reduce or avoid the harm of autumn rain, while paying attention to the prevention and control of rice blast, botrytis and other diseases.

White Dew phenomenon

White Dew is divided into three, respectively, "a wait for the wild geese, the second wait for the return of the Xuanbird, the third wait for the flock of birds to raise shy." White Dew Festival, the summer gradually disappear, high and cool in the fall, the fragrance of cinnamon, wild geese and swallows and other migratory birds began to fly south to avoid the cold, a variety of birds began to store the winter food. "The geese come and the birds return." After the white dew, the most sensitive to the climate of migratory birds collective migration. The geese began to fly from the north to the south, and the southern basilisks also flew back to the north, all kinds of birds began to store food for the winter. Proverb has a cloud: "white dew autumn wind night, geese fly south a line", "the autumn robin hypnotizes people to sleep, at the summer sunflower smile, white dew swallow return and come geese, the autumn equinox cinnamon fragrance full of garden". Therefore, migratory birds like geese are regarded as a symbol of the arrival of autumn.