How much contribution does raindrop make to human beings?

Rain Water

Rain-indicates that the precipitation begins and the rainfall gradually increases.

Gregorian calendar every February 18 or so is a rainy solar term. At this time, the sun reaches 330 degrees of the yellow meridian, which is the solar term of "rain". Rain has two meanings, one is that the weather gets warmer and the precipitation increases gradually, and the other is that there is less snow and more rain. "Twenty-four solar terms" said: "In the first month, water is in the sky. Spring belongs to wood, but there must be water for those who grow wood, so there is rain in beginning of spring. If the east wind melts, it will disperse into rain. " After the "rain", the temperature in most parts of China rose to above 0℃, the daily average temperature in Huanghuai Plain reached about 3℃, the average temperature in Jiangnan was about 5℃, the temperature in South China was above 10℃, and the average temperature in North China was still below 0℃. Before and after rainfall, rape and winter wheat generally turn green and grow, which requires high water content. "Spring rain is as expensive as oil", so proper precipitation is particularly important for crop growth. At this time, the precipitation in North China, Northwest China and Huanghuai areas is generally less, which often cannot meet the needs of agricultural production. If there is little rain in early spring, the best economic benefit can be obtained by timely spring irrigation before and after the rain. In the area south of Huaihe River, it is mainly to strengthen intertillage and hoeing, and at the same time, do a good job in clearing ditches and draining water in the field to prevent excessive spring rain from causing wet damage and rotten roots. As the saying goes, "Water the flowers with wheat, water the flowers with vegetables", and the coated rape should be topdressing with moss fertilizer in time to compete for more pods. South China's double-cropping early rice seedling cultivation has begun, so we should pay attention to "cold tail and warm head", and strive to sow all the seedlings at once.

In ancient China, rainwater was divided into three stages: "One stage was that Rex sacrificed fish; Second, wait for Hongyan to come; Third, wait for the grass to sprout. " In this solar term, otters start fishing and put the fish on the shore like sacrifices before eating; Five days later, the geese began to fly back to the north from the south; In five days, in the "moist and silent" spring rain, the spirit of the sun rises everywhere in the vegetation and begins to sprout. Since then, the earth has gradually begun to show a thriving scene.

The rainy season is changeable, which is one of the seasons with the most cold wave processes in the whole year. This kind of hot and cold weather is very harmful to the growth of crops, forests and fruits that have sprouted and turned green and people's health. While paying attention to the cold and antifreeze work of crops, greenhouse vegetables and industrial and commercial departments, we should still pay attention to personal hygiene and health care to prevent the occurrence of epidemic diseases such as colds in late winter and early spring.

Some weather proverbs about rain are based on rain and snow to predict the later weather, such as "Rain turns cloudy with rain" and "Rain falls, cloudy turns Grain Rain". According to the cold and warm weather, there are "cold rain, warm shock" and "warm rain, cold shock" Some people also predict the weather in the later period according to the wind, such as "rain comes from the east, and it will rain in the dog days" and so on.

The weather characteristics of rain solar terms have great influence on the growth of overwintering crops. An agricultural proverb says, "Rain and dew are good crops, and Da Chun Koharu is a treasure." "Spring is getting warmer and warmer, and the rain is busy." According to the weather characteristics, the vast rural areas should carry out weeding and fertilization on the middle tillage such as Sanmai, clear ditches and bury soil moisture to prepare for drainage and waterlogging prevention.

With the arrival of rain and solar terms, snowflakes are flying, and the cold air is gradually disappearing, while the days of spring breeze, melting ice and snow, moist air, mild sunshine and drizzle are coming to us.

Every February 19 or so, the sun reaches 330 degrees of the yellow meridian, which is the solar term of "rain". Rain has two meanings, one is that the weather gets warmer and the precipitation increases gradually, and the other is that there is less snow and more rain. "Twenty-four solar terms" said: "In the first month, water is in the sky. Spring belongs to wood, but there must be water for those who grow wood, so there is rain in beginning of spring. If the east wind melts, it will disperse into rain. "

After the "rain", the temperature in most parts of China rose to above 0℃, the daily average temperature in Huanghuai Plain reached about 3℃, the average temperature in Jiangnan was about 5℃, the temperature in South China was above 10℃, and the average temperature in North China was still below 0℃. Before and after rainfall, rape and winter wheat generally turn green and grow, which requires high water content. "Spring rain is as expensive as oil", so proper precipitation is particularly important for crop growth. At this time, the precipitation in North China, Northwest China and Huanghuai areas is generally less, which often cannot meet the needs of agricultural production. If there is little rain in early spring, the best economic benefit can be obtained by timely spring irrigation before and after the rain. In the area south of Huaihe River, it is mainly to strengthen intertillage and hoeing, and at the same time, do a good job in clearing ditches and draining water in the field to prevent excessive spring rain from causing wet damage and rotten roots. As the saying goes, "Water the flowers with wheat, water the flowers with vegetables", and the coated rape should be topdressing with moss fertilizer in time to compete for more pods. Seedling raising of double-cropping early rice in South China began. The rainy season is changeable, which is one of the seasons with the most cold wave processes in the whole year. This kind of hot and cold weather is very harmful to the growth of crops, forests and fruits that have sprouted and turned green and people's health. While paying attention to the cold and antifreeze work of crops, greenhouse vegetables and industrial and commercial departments, we should also pay attention to personal health care to prevent some diseases from spreading in late winter and early spring.

The rainy season means that it begins to rain and the rainfall gradually increases. In the Yellow River valley, the birthplace of the 24 solar terms, it was cold before the rain, but it was snowing and raining unpleasantly. After the rain, the temperature can generally rise above 0℃, with less snow and more rain. However, in the warm southern region, even in the dead of winter, rainfall is not uncommon. The average temperature in most parts of southern China in this period is above 10℃, peaches and plums are in bud, and cherries are in full bloom. It is indeed a climatic spring. In addition to a few years, the frost period has come to an end. It is timely to graft fruit trees and plant trees. After a dry winter, there are many droughts in spring all year round in South China, especially in the western part of South China, where "spring rain is as expensive as oil". In agriculture, attention should be paid to moisture conservation and timely irrigation to meet the water supply at jointing and booting stage of wheat and at the critical stage of bolting and flowering of rape. The mountainous area of the northwest plateau is still in the dry season, with low temperature and high wind speed, which is prone to forest fires. In addition, the invasion of cold wave will cause strong cooling and snowstorm, which will do great harm to the old, weak and young animals. These should pay special attention to prevention.

The rainwater bucket is located at the entrance of the rainwater from the roof gutter into the rainwater pipeline. The rainwater hopper is equipped with a rectifying grid device, which can quickly drain the rainwater on the roof. The grille has the function of rectifying, avoiding the formation of excessive vortex, stabilizing the water level in front of the hopper, reducing aeration and quickly discharging rainwater and snow water from the roof. It can also prevent large sundries from flowing into the pipeline. If it is a siphon rain bucket, there should also be a forced destruction vortex sheet (located in the middle of the rain bucket). When the horizontal height of rainwater submerges the forced destruction vortex sheet on the rainwater bucket,

Precipitation caused by atmospheric convection is also called convective rain. When the air near the ground is heated or the air above is strongly cooled, the air below rises, and the water vapor cools and condenses, which will form convective rain. Before the arrival of convective rain, there are often strong winds, which can pull up trees with a diameter of 50 cm, accompanied by lightning and thunder, and sometimes hail.

Convective rain is mainly produced in cumulonimbus clouds, where ice crystals and water droplets exist. The vertical thickness and water vapor content of clouds are particularly large, and the airflow fluctuates strongly, reaching 20 ~ 30m/s. Clouds are charged, so cumulonimbus clouds often develop into strong convective weather and produce heavy rain. Lightning strikes, strong winds and heavy rains often occur in such thunderstorms.

Pale cumulus clouds are thin and have low water content, so rain usually falls to the ground. Cumulus seldom rains in the middle and high latitudes, but in the low latitudes, it can sometimes produce precipitation because of its rich water content and strong convection.

Convective rainfall is the most frequent in low latitudes, and the precipitation time is generally in the afternoon, especially in equatorial regions, and the precipitation time is very accurate. In the morning, the sky is clear. With the rising of the sun, the sky cumulonimbus clouds gradually formed and developed rapidly, and became thicker and thicker. In the afternoon, cumulonimbus clouds surged, the weather was sultry, the wind passed, the thunder and lightning were mixed, and the rain poured down. The precipitation continued until dusk, and it was sunny and slightly cool after the rain, but the next day, there were repeated thunderstorms. In the middle and high latitudes, convective rain mainly appears in the summer half year and is extremely rare in the winter half year.

Rainwater agriculture

The rain temperature rises, and the land in North China gradually thaws.

Hoes for catching winter wheat, hoes layer by layer.

Barley, sunflower and castor oil have high yield by top seeding.

The water in the Yellow River can be stored and irrigated quickly before it is blocked.

River water and well water are matched, so the water is guaranteed when used.

The fertilizer from Springfield has already arrived, and the rake can't stop.

Vigorously engage in cotton nutrition bowl, timely early sowing and seed saving.

Sweet potato seedlings should be planted early, and kang and pit should be dug.

Orchard carefully managed, pruning, scraping leaves and loosening the soil.

Cattle, donkeys, mules and horses should be fed, and spring ploughing and spring sowing are like tigers.

Fish farming should make use of abandoned land, burn bricks and dig fish pits,

Combined with the accumulation of fertilizer and the whole fish pond, the pond is deep and strong, which increases the fish food.

Deep water can raise big fish, with three layers of fish.