Grain Rain introduction

Grain Rain is the sixth of the 24 solar terms. Every year from April 19 to April 2 1 day, when the sun reaches 30 degrees of the yellow meridian, it is Grain Rain, which comes from the old saying "Rain gives birth to hundreds of valleys". At the same time, it is also the best time for sowing, transplanting and ordering beans. Grain Rain is the last solar term in spring. The arrival of Grain Rain solar term means that the cold wave weather basically ends and the temperature rises rapidly, which is extremely beneficial to the growth of cereal crops. In ancient China, Grain Rain was divided into "three stages": "The first stage began at Houping; The second time, pigeons blow feathers; The third is that Dai Sheng fell to Sang. " After Grain Rain, rainfall increased, duckweed began to grow, then cuckoo began to remind people to sow, and then Dai Sheng birds began to be seen on mulberry trees.

After the solar term in Grain Rain, rainfall increased, and rain gave birth to hundreds of valleys. With sufficient and timely rainfall, cereal crops thrive. In the southern region where the grain is abundant, "When the flowers fall, the cuckoo cries at night, the peony is bloom, and the cherry is ripe." The natural scenery tells people that it is late spring. At this time, the temperature in the south rises rapidly. Generally, in late April, except for parts of northern and western South China, the average temperature has reached 20℃ to 22℃, which is more than 2℃ higher than that in mid-April. High temperatures above 30℃ often occur in eastern South China for a day or two, which makes people feel very hot. Low-altitude valley areas are used to enter summer. The climate characteristics of high temperature in south China in spring are beneficial to the early cropping cultivation measures in Da Chun. The suitable planting temperature of Polygonum cuspidatum is 65438 08℃ to 22℃, which can be satisfied at this time. The experience in the old arid areas in southern China has proved that planting Osmunda japonica early in Grain Rain can seal vine leaves before summer drought, enhance drought resistance and achieve high and stable yield.