What does Grain Rain have to do with the climate?

The Relationship between Grain Rain and Climate

Grain Rain means "Rain gives birth to hundreds of valleys". It shows that the solar term rainfall is sufficient and timely, which is suitable for the vigorous growth of cereal crops. From the Spring and Autumn Period to the Western Han Dynasty, the middle and lower reaches of the Yellow River began to sow grain at this time, which was the time when rain was needed. In the Book of Changes and Huainanzi, Grain Rain has been clearly defined as one of the 24 solar terms. Yi Zhou Shu records that he was born in Grain Rain.

This also reflects the increase of rain from the phenology. However, with the passage of time and climate change, the Yellow River basin is not as warm and humid as it was then.

During the period of Grain Rain, the precipitation, precipitation days and precipitation intensity in the Central Plains increased obviously. The area of XX in southern and western Henan generally reaches 50 ~ 60mm, especially in the southernmost county of Henan, reaching117.9mm. Compared with the previous solar term, the number of precipitation days generally increases by 1 ~ 2 days. Its distribution lasts for about 4 days in most areas, 5 ~ 6 days in XX District, Nanyang and Xinyang, and as many as 8 days in XX County. However, although the precipitation in this period can basically meet the average requirements of crop sowing and growth for many years, it is not always the case.

For example, from 195 1 to 1970, the precipitation was less than 15 nlm, with Luoyang accounting for 35% and Zhengzhou and Kaifeng accounting for 50%. Jinan, Shandong Province, located in the lower reaches of the Yellow River, is as high as 55%, and it never even rains in some years. Therefore, there is also a saying that "spring rain is as expensive as oil".

Main Farming in Grain Rain

Rice fertilizer transportation, base fertilizer application, winter ploughing and harrowing. Seeding and seedling raising, seedling field management.

Covering seeds, fertilizing, soil preparation, covering seeds early when sowing, homogenizing seedlings, cultivating initial seedlings, topdressing, and controlling soil silkworms. Sow soybeans and miscellaneous beans.

Wheat is resistant to drought and moisture, rust (powdery mildew, wheat aphid), and smut plants.

Potato intertillage, topdressing, soil improvement and control of late blight.

After Grain Rain, rape began to harvest.

Soil preparation, fertilization and transplanting of flue-cured tobacco.

Spring tea was picked after Tomb-Sweeping Day.

Silkworm * * urges * * to breed, and strengthens the management of spring silkworm rearing.

Prevent forest fires, prevent "late spring cold" and hail.