Autumn is getting quiet, and the first frost comes suddenly.

"Autumn is getting quiet and the first frost is coming suddenly" is a poem describing autumn. It means that the breath of autumn is gradually quiet, and the solar terms of the first frost suddenly come.

This poem expresses the feeling of tranquility and coldness in autumn by describing the atmosphere and changes of solar terms in autumn. The first frost is the18th of the 24 solar terms, usually on the 23rd or 24th of 10 in Gregorian calendar. In the first frost season, the weather turned cold, frost began to appear, plants gradually turned yellow, and autumn scenery gradually faded. This also indicates that autumn is coming and winter is coming.

The origin of the first frost solar terms can be traced back to ancient times. According to the records in the ancient book "Twenty-four Solar Terms", the word "first frost" means that the weather is getting colder and the dew condenses into frost. In ancient times, it was observed that the temperature gradually dropped in autumn and dew began to condense into frost, so this period was called the first frost.

The characteristics of the first frost solar terms mainly include the following aspects:

1, temperature change: the first frost is the last solar term in autumn, the weather is getting colder and the temperature difference between day and night is increasing. It is cold in the morning and evening, hot at noon and dry in autumn. After the first frost, the temperature dropped further, especially in the north, and the average temperature in some areas has dropped below 0 degrees Celsius.

2. Plant changes: In the first frost season, plants began to turn yellow, plants gradually lost their vitality, and the earth presented a bleak scene. This is because the temperature drop leads to the weakening of plant growth activities and enters a dormant state.

3. Dry climate: The main climate feature in autumn is dryness, which is more obvious in the first frost. This is because the weather is getting colder and colder, and the humidity in the air is reduced, which leads to the feeling of dryness.

4. Farming activities: In the first frost season, farmers will carry out corresponding farming activities according to the climate characteristics. For example, in the first frost season, there is a proverb in Hebei Province, "Cold dew first frost, harvest soybeans. Late-maturing wheat, surprise sowing. " It means harvesting soybeans in time and sowing late-maturing wheat. In addition, we should also pay attention to cleaning up the straw in the field, digging deep into the soil and reducing the occurrence of pests and diseases.