The solstice of summer doesn't mean that summer is coming. Summer solstice means hot summer is coming, and the day is the longest in the northern hemisphere.
After the summer solstice, the ground is heated strongly and the air convection is strong, and thunderstorms are often easy to form in the afternoon to evening. This kind of hot thunderstorm comes and goes, and the rainfall range is small. People call it "dividing fields in summer and rain". Liu Yuxi, a poet in the Tang Dynasty, skillfully used this weather to write a famous poem, "The east rises and the west falls, and the road is sunny and sunny." The heavy precipitation brought by convective weather is not always as beautiful as described in the poem, and it often brings local disasters.
During the summer solstice, the temperature is high, the sunshine is sufficient, the crops grow rapidly, and the physiological and ecological water demand is high in most parts of China. At this time, the precipitation has a great influence on agricultural output, and there is a saying that "raindrops are worth tens of millions in summer solstice". At this time, the precipitation in the middle and lower reaches of the Yangtze River can generally meet the needs of crop growth.
In most cases, during the "summer solstice" period, the middle and lower reaches of the Yangtze River and the Jianghuai basin are rainy and frequently rainstorm, which is easy to cause floods and even threaten people's lives and property. Attention should be paid to strengthening flood control work.
Which solar term means that summer is coming?
A long summer. Long summer means the beginning of summer.
Astronomically, long summer bid farewell to spring, which is the beginning of summer. When the temperature rises obviously, the summer heat comes, thunderstorms increase and crops enter the peak season, people are used to taking long summer as an important solar term. The climate in this period is pleasant, and the average temperature in the north is 19℃-23℃, which is the best time for many warm-loving vegetables to blossom and bear fruit, and it is also the high incidence period of vegetable diseases and insect pests in the reserve. The main agricultural activities in vegetable fields this month include: releasing vegetables in greenhouses day and night, strengthening water and fertilizer management, and strengthening the prevention and control of pests and diseases of various vegetables, improving commodity rate and striving for high yield and efficiency.
In the middle of last year, we should pay close attention to planting watermelon, pepper, eggplant and other vegetables in the wheat field, and the interplanting time should be 20-25 days before the wheat harvest, not too early. Cultivate heat-resistant Chinese cabbage and Chinese cabbage seedlings. Sow summer beans and cucumbers. Seedling raising of autumn celery in the open field began.
The "Li San" celery, commonly known by the masses, is to grow seedlings in long summer, sow in beginning of autumn and harvest in beginning of winter. Germination should be accelerated at low temperature before sowing, and the seedling field should be closed for weeding within 3 days after sowing. Pay attention to shade, rain, disease prevention and moisture prevention when seedlings are grown.
In the long summer season, the temperature difference between north and south of China is large, and the same area fluctuates frequently. The average temperature in most parts of the country is around 18-20℃.