How does Man Cang explain the meeting between the first frost and the frost valley?

Literally, if the frost occurs before the first frost, the rice (or other food crops) in the field will be like chaff. If there is frost after the first frost, the rice (or other food crops) in the field will have a good harvest and can be stored in the whole granary.

If there is frost weather before the first frost, the time is about 5438+ 10 in the first half of June, which indicates that the temperature will drop earlier (if the temperature drops below zero degrees Celsius, there will be frost). For some areas in the south where late rice is planted.

In the first half of June of 65438+ 10, the late rice was still in the filling stage. When encountering cold weather, it will affect the normal filling and lead to the increase of chaff. Once the chaff appears, it is rice bran, only the skin has no meat, and the yield decreases. Therefore, there is a saying that "before first frost, rice was like chaff".

The first frost is the 18 of the 24 solar terms.

It is also the last solar term in autumn. In terms of climate characteristics, the most obvious feature of the first frost solar term is the sudden drop in temperature and the large temperature difference between day and night. But the first frost is not directly related to frost. The first frost is a solar term, and frost is a natural phenomenon. It does not necessarily fall in the first frost, nor does it necessarily appear in the first frost solar terms.

Judging from the actual situation in previous years, the first frost in different regions may appear before or after the solar terms, and the situation may be different every year. It is precisely because of this difference that there is an agricultural proverb circulating among the people, "Before first frost, rice was like chaff; Frost after frost, Valley Man Cang ".