The Beginning of Summer in History is the 7th solar term among the 24 solar terms, the first solar term of summer, and falls on May 05-07 of the Gregorian calendar every year. At this moment, the handle of the Big Dipper is pointing southeast, and the sun's longitude reaches 45 degrees. Calendar: "Dou refers to the southeast, which is called the beginning of summer. Everything grows up here, hence the name 'beginning of summer'. After the beginning of summer, the sunshine increases, gradually heats up, and thunderstorms increase. Lixia is an important solar term that marks the beginning of the peak season for all things to grow. By the beginning of summer, all things are flourishing.

Li Xia means bidding farewell to spring and marking the beginning of summer, hence it is also known as the "end of spring day". Spring birth, summer growth, autumn harvest, winter storage. Due to China's vast territory and large north-south span, natural rhythms vary in different regions. At the beginning of summer, only the area south of the Nanling Mountain Mountains in China presents the summer scene of "thick shade of green trees, long summer days, and buildings reflected into the pond"; At this time, some areas in the northeast and northwest had just begun to have the breath of spring.
On the day of the Beginning of Summer, many places have customs such as eating "Beginning of Summer Rice", eating eggs, weighing people, and tasting new foods.
Entering the beginning of summer season, people's metabolism accelerates, and the supply of blood to the heart and brain is insufficient, often causing restlessness, fatigue, and laziness. Reasonable scheduling of daily routines, supplementation of nutrients, and adoption of correct health and wellness methods should be implemented. origin
Li Xia "is the beginning of summer, and the so-called" Li "means the beginning. Li Chun, Li Xia, Li Qiu, and Li Dong respectively represent the beginning and arrival of spring, summer, autumn, and winter. In order to more accurately describe the temporal characteristics, ancient people divided solar terms into four groups based on weather and phenology: "fen", "zhi", "kai", and "kai". 'Fen' refers to the spring and autumn equinoxes, formerly known as' binary equinoxes'; 'Zhi' refers to the summer solstice and winter solstice, formerly known as' Er Zhi '; 'Qi' refers to the beginning of spring and summer, while 'Xi' refers to the beginning of autumn and winter. 'Li Chun', 'Li Xia', 'Li Qiu', and 'Li Dong' are collectively known as the 'Four Li', which together form the 'Eight Festivals'.
Xia is referred to as' Changying 'in the book' Erya '; Win means' full 'or' surplus'. Lixia is an important solar term that marks the beginning of the peak season for all things to grow. All things have grown up here, hence the name Lixia. Regarding the Beginning of Summer, Wu Cheng, a native of the Yuan Dynasty, explained in his book "Interpretation of the Seventy Two Houhou of the Moon Order" that "Summer is fake, and everything is fake and big until now." Here, "fake" means "big", which means that the plants in spring have already grown up by this time. After the beginning of summer, the rainy season officially begins, with a significant increase in rainfall and rainy days. Spring, summer, autumn harvest, and winter storage are the best seasons for many crops to grow vigorously. Adequate sunlight, suitable temperature, and abundant rainfall provide the necessary conditions for plants. All things flourish, starting from the beginning of summer. It is a reflection of agricultural culture on festivals.
Meteorological changes
One of the climatic characteristics of the Li Xia solar term is a significant increase in showers and thunderstorms. The increase in precipitation and its intensity are caused by factors such as the confrontation between cold and warm air, as well as convective weather resulting from the rise of warm and humid air currents near the ground. Lixia is an important solar term that marks the beginning of the peak season for all things to grow. According to the classification standards of modern Chinese climatology (average temperature), when the daily average temperature steadily rises above 22 ℃, summer begins. Before the Beginning of Summer solar term, the range of spring in China reaches its peak. Except for Hainan, Guangdong, Guangxi, central and southern Jiangxi, southern Hunan, Fujian and other places where summer is the season, most other areas are still in spring. At the beginning of summer, it symbolizes the beginning of summer, and the long dormant summer begins to advance northward in large numbers, reaching North China.
After the beginning of summer, the rainy season officially begins, with a significant increase in rainfall and rainy days. Summer is the best season for many crops to grow vigorously, with ample sunlight, suitable temperatures, and abundant rainfall providing the necessary conditions for plants. In summer, influenced by warm and humid air currents from the ocean, the southern region is generally hot, humid, and rainy. The Qinling Huaihe River is a transitional area between heavy rainfall in the south and less rainfall in the north. From the vicinity of the Qinling Mountains and Huaihe River to the north, rainfall decreases sharply. By the beginning of summer, all things are flourishing. Due to China's vast territory and large north-south span, natural rhythms vary in different regions. Before and after the "Beginning of Summer", only the area south of the line from Fuzhou to the Nanling Mountain may enter summer in China, while most other areas are still in spring. In some areas of the northeast and northwest, it is even just entering spring at this time.
After the beginning of the summer solar term, in the middle and lower reaches of the Yangtze River and South China, the rainfall increased rapidly in the middle of May. At this time, South China also entered the peak period of the pre flood season. At this time, the rainstorm often has the characteristics of continuity in time, extensiveness in region, and violence in intensity. In the the Pearl River water system in Guangdong and Guangdong and the Minjiang river water system in Fujian, the highest annual water level often occurs during this period. There is a folk saying that "the beginning of summer, the small full, the river full, and the river full". During the beginning of summer, the average temperature in most parts of the country is around 18-20 ℃. At this time, although the temperature in North China, Northwest China and other areas has risen rapidly, the precipitation is still not much. In addition, the spring is windy and the evaporation is relatively strong, making the weather very dry.
Agricultural activities
Around the beginning of summer, it is the season for transplanting early rice in the north and south of the Yangtze River. Being able to plant full moon seedlings without uprooting full moon grass "means that the temperature is still low. After planting seedlings, it is necessary to immediately strengthen management, fertilize early, cultivate the field early, treat pests and diseases early, and promote early growth. We should pay close attention to cleaning up the leftovers when sowing mid season rice. At this time, the spring shoots of tea trees develop the fastest. If you are not careful, the tea leaves will age. As the saying goes, 'the rain is rare, but the harvest will not stop in the beginning of summer.' We need to concentrate our efforts and harvest them in batches. Dry air and soil in North China, Northwest China and other regions often seriously affect the normal growth of crops. Especially the dry hot air before and after wheat grain filling and milk ripening is an important disaster weather that leads to yield reduction. Timely irrigation is a key measure for drought resistance and disaster prevention.
At the beginning of summer, everything is flourishing. Summer harvest crops enter the late stage of growth, winter wheat blooms and fills the grain, rapeseed approaches maturity, and the annual scenery of summer harvest crops is basically determined. Therefore, there is a saying in agriculture that goes, 'Look at summer at the beginning of summer'. The management of rice planting and other spring crops has also entered a busy season.
During the beginning of summer, the main prevention and control measures include tomato early blight, gray mold, leaf mold, cucumber downy mildew, bacterial leaf spot disease, eggplant brown stripe disease, cotton wilt disease, cowpea rust disease, root rot disease, etc. The main pests include small ground tigers, aphids, cabbage caterpillars, jumping beetles, leaf miner flies, etc.