According to the central meteorological station, the daily average temperature in most areas of China has generally dropped by about 10 ℃ recently, reaching over 17 ℃ locally. On March 29, the lowest temperature in Huanghuai, Jianghuai, Jianghan and Jiangnan was 4-9 ℃!

today and tomorrow, the rain in the South continues to fall, and in the future, it will rain one after another until Qingming. Since yesterday, a new round of rainfall in the South has begun. According to the actual monitoring, heavy rain has occurred in central and southern Hunan, central and northern Jiangxi, central and Northern Fujian, and central and southern Zhejiang.
Jiangsu: the wheat is heading. It's snowing

According to the information in the technical exchange group of agricultural technology promotion system in Taizhou City, Jiangsu Province, on March 28, it snowed in Jingjiang, Taixing, Yangzhong, Zhangjiagang, Danyang and other places in Jiangsu Province. It's a surprise that the wheat is heading, but it's caught in the spring snow.
Guizhou: hail hit 22 counties and cities

Recently, the most severe convective weather process has occurred in Guizhou Province since spring, with rainstorms in 11 counties (urban areas) with the largest rainfall of 90.7mm in gongnan Township, Taijiang County; in addition, hails occurred in 22 counties (urban areas) with the largest Hail Diameter of 25mm, causing damage to some houses and crops. The picture shows hail in the town of Langde, Leishan County, Guizhou Province.

There are 5 rainstorm observation stations in 5 counties in the whole province, hail appears in 23 counties (cities, districts) with the largest Hail Diameter of 35mm in Changshun, and thunderstorm gale of level 6-9 occurs in 15 counties (cities, districts) with the largest wind speed of 27.3m/s in Rongjiang plan and Congjiang Jiamian.
Guangdong: heavy rain and flooded farmland in Shaoguan
Recently, severe convective weather occurred in Qujiang, Shaoguan. 18 automatic meteorological stations recorded rainstorms with an average rainfall of 68.6 mm. The short-term heavy rainfall led to the rapid rise of river water in many towns, some rural roads and farmland were flooded, and the river was blocked by branches, which affected the traffic. The local government has organized personnel to clean up.
Guangxi: Severe Rainstorm and waterlogging in Nanning

Guangxi has been hit by short-term heavy rainfall in many places. The hourly rainfall in Nanning exceeds 50 mm, resulting in serious waterlogging.
Jiangxi: strong convection, windows destroyed, trees pulled out, hail all over the ground

Due to the influence of strong convective cloud system, severe convective weather such as hail, thunderstorm, gale, short-term heavy rainfall and strong lightning appeared in many villages and towns of Dingnan County, Ganzhou City, Jiangxi Province from west to East. After the hailstorm, many trees in Dingnan county were broken, and the glass of residential buildings was smashed, and everywhere was in a mess.
Hail in Lichuan, 1.39 million yuan of agricultural loss

The whole process lasted about 30 minutes. The affected area of the whole town is 69.3 hectares. 15 villages were hit by hail, the main crops such as potato, rape and other vegetables were damaged; the main economic crops such as grape, Fritillaria, cabbage, peach tree and plum tree were seriously damaged, resulting in a direct economic loss of 1.506 million yuan, including agricultural loss of 1.39 million yuan.
Beware of cold in spring
Wang Longjun, deputy director of Jiangsu Agricultural Technology Extension Station, said that in the artificial freezing room test, when the wheat meets - 0.7 ℃ (weather forecast temperature of the shutter box is about 3 ℃), the pollen mother cells in the meiosis stage will be killed.
The snowfall will have a very adverse impact on wheat. The key is the minimum temperature and duration, which may eventually lead to the formation of a half empty shell ear, or even a whole ear empty shell. If the minimum temperature is below 0 ℃, the influence will be greater. If the minimum temperature is above 1 ℃, it will be lighter.

It is reported that the cold resistance of flower buds and young fruits of fruit trees is poor, and freezing damage is very easy to occur in flowering and young fruit stages. At present, many fruit trees in Guangdong, Yunnan, Guizhou and other places are in the stage of flowering and fruit setting, including mango, litchi longan, grape, etc. these fruit trees suffer from frost damage, often causing great economic losses.

In case of late spring cold, artificial pollination should be carried out in time for the flowers that are not damaged by frost and are opening. Spring irrigation before the cold current can reduce the ground temperature and delay the flowering period by 2-3 days. In addition, the fruit trees can be kept warm by painting white, laying plastic film, and smoking in orchard to prevent the occurrence of freeze injury.
Spraying foliar fertilizer, such as potassium dihydrogen phosphate, can enhance the photosynthetic efficiency of leaves and produce nutrients to ensure the normal growth of fruit trees.