What are the effects of the fright and the white dew on agriculture?

Sting: Sting means hiding. Sting refers to the sudden movement of spring thunder, which awakens the hibernating animals in the soil.

Awakening of Insects

On March 5th and 6th, every year, when the sun reaches 345 degrees, it is "in a daze". Sting means that when the weather gets warmer, the spring thunder begins to sound, awakening the insects that are dormant and hibernating underground. "Twenty-four solar terms" said: "February Festival, everything vibrates, and when it vibrates, it thunders, so it is called thunder. It's an escaped cockroach. Tao Yuanming, a poet in the Jin Dynasty, said in a poem: "In the spring rain, the east corner began to thunder, and everyone was lurking and the vegetation was comfortable. "In fact, insects can't hear thunder. Spring is back, and the warmer weather is the reason why they end their hibernation and "run away in surprise". In China, the time when the spring thunder begins to ring varies from place to place. On the average for many years, thunder can be heard in southern Yunnan around the end of 1, and the first thunder day in Beijing is in late April. The saying that "thunder begins with you" is consistent with the climate law in Jiangnan.

"Spring thunder rings, everything grows", and it is a fine sunny day in September, with the temperature rising and the rain increasing. In addition to the winter scene in which the northeast and northwest regions are still covered in white, the average temperature in most parts of China has risen above 0℃, the average daily temperature in North China is 3-6℃, the temperature in the south of the Yangtze River is above 8℃, and the temperature in Southwest China and South China has reached 10- 15℃, which is already a harmonious spring. Therefore, the working people in our country have attached great importance to this solar term since ancient times and regarded it as the beginning of spring ploughing. There is a cloud in the Tang poetry: "A light rain brings new flowers, and a thunder starts. Tian Jia was idle for a few days, and farming began. " Agricultural proverbs also say, "Spring ploughing can't stop, after the Scare Festival", "Let a hundred flowers blossom and farm work come together." Winter wheat in North China began to turn green, and the soil was still frozen and thawed alternately. Raking the ground in time is an important measure to reduce water evaporation. "Shocking without harrowing is like steaming steamed bread", which is a valuable experience for local people to fight drought and conserve moisture. Wheat in the south of the Yangtze River has been jointing and rape has begun to blossom. There is a high demand for water and fertilizer, so topdressing should be done in time, and proper irrigation should be done in dry and rainy places. Rain in the south can generally meet the needs of vegetables, wheat and green manure crops in spring, and it is most important to prevent wet damage. As the saying goes, "It's better to dump manure than to plow wheat with three pipes" and "If you want to harvest rapeseed, you must manage plowing diligently". We should continue to do a good job in ditch cleaning and drainage. We should pay close attention to sowing early rice in South China, and at the same time do a good job in cold prevention in rice fields. As the temperature rises, tea trees gradually germinate, so it is necessary to prune and apply "germination accelerating fertilizer" in time to promote more branches and leaves and increase tea yield. Fruit trees such as peaches, pears and apples should be fertilized before flowering.

"Spring thunder scares thousands of insects", and the warm climate conditions are conducive to the occurrence and spread of many diseases and insect pests, and weeds in the fields are also sprouting. It is necessary to do a good job in pest control and intertillage weeding in time. "Peach blossoms come, swine fever comes", and we should also pay attention to the epidemic prevention of poultry and livestock.

White dew: The weather turns cold and the dew condenses into white.

White dew-the temperature began to drop, the weather turned cold, and there was dew on the vegetation in the morning. The Millennium is around September 7 of the Gregorian calendar every year.

Millennium is the first solar term in August. Dew is water droplets formed by condensation of water vapor on the ground or near-earth objects due to temperature drop. So the Millennium actually indicates that the weather is getting cold. At this time, people will obviously feel that the hot summer has passed and the cool autumn has arrived. Because the temperature is still more than 30 degrees during the day, but it drops to more than 20 degrees at night, and the temperature difference between them is 10 degrees.

Yang Qi reached its peak in the summer solstice, and these two extremes must be reversed, and Yin Qi also rose at this time. When it comes to the White Dew, the yin gradually increases, and the morning dew gradually thickens and condenses into a layer of white water drops, so it is called the White Dew. As the saying goes, "eighteen pots of summer heat, not exposed to the Millennium." These two sentences mean that it is still hot in summer, so you must take a bath with a basin of water every day. After eighteen days, in the new millennium, don't be shirtless and naked, lest you catch cold. There is also a saying: "White dew and white fans, the autumn equinox is beautiful." This means that if there is dew before and after the white dew, the late rice will have a good harvest.

In addition, in the climate of 24 solar terms in South China, the White Dew has the obvious characteristics of rapid temperature drop, continuous rain and sudden decrease of sunshine, which profoundly reflects the seasonal changes from summer to autumn. The average temperature in South China during the perennial white dew period is about 3℃ lower than that in summer, and the average temperature in most areas (5 days) has dropped below 22℃. According to the standard of dividing four seasons by climatology, the time series begins to enter autumn. Autumn rain in South China mostly occurs from the white dew to the first frost, with the most in the middle and lower reaches of Minjiang River and Qingyi River, and relatively less in the middle of South China. The agricultural proverb "There are too many white dew, walking around every day" can't predict the weather by whether it rains on the day of the white dew, but there will always be a period of continuous rainy weather before and after the white dew festival. Moreover, since then, rainfall in South China has been characterized by low intensity, frequent rainy days and continuous rainfall. Accordingly, the sunshine in the white dew period in South China is reduced by about half compared with that in summer, and this decreasing trend continues until winter. The above-mentioned climatic characteristics of the Millennium season are not conducive to heading and flowering of late rice, but also affect the harvesting and sunning of middle rice, so there is a saying in agricultural proverbs that "the Millennium is sunny and the rice is as white as silver". Only by fully understanding the Millennium climate characteristics and taking corresponding agricultural technical measures can the harm of autumn rain be alleviated or avoided. On the other hand, we should also seize the rainwater to store water, especially the Bailu in eastern South China is another solar term with more rainfall after Xiaoman and summer solstice. Don't miss the good opportunity.