It has rained for more than five days in Henan.

It has rained for five consecutive days in Henan, so it is necessary to guard against the adverse effects on the autumn harvest.

According to the forecast of Henan Meteorological Observatory, due to the influence of the warm and humid airflow in the southwest of the western Pacific subtropical high, there will be continuous rainy weather in Henan from September 23 to 28. It is necessary to guard against possible mountain torrents, geological disasters and adverse effects on autumn harvest and traffic.

According to the forecast, there will be moderate rain between Huanghuai and Southwest China on September 24th. From 25 to 27, some counties and cities in the central, western and northern regions had moderate rain and local heavy rain; On the 28th, there was moderate rain and partial heavy rain in the west and south, accompanied by northerly winds with 4-5 grades and gusts of 7. This round of rainy weather lasted for 6 days; The accumulated rainfall in the western part of Huanghuai in our province is relatively large, with the accumulated rainfall of 50-80mm, 100- 130mm in some areas and 25mm in most other areas.

Before 28th, the temperature in the whole province was low, and the highest temperature in the central and western regions was 17 to 2 1 degree. It is expected that this round of rainy weather will end on the 29th. Before June 3rd 10, the weather in the whole province was mainly sunny or cloudy.

Autumn crops have entered maturity in most areas south of the Yellow River in our province. At present, the soil in most parts of the province is moist, and the soil water content in some areas is supersaturated. Continuous rainy weather affects autumn grain harvesting in most areas south of the Yellow River, and the risk of autumn grain germination and mildew increases after harvesting, which is not conducive to autumn grain filling maturity in northern Henan. The combination of wet soil and windy weather will increase the lodging risk of corn, affect the formation of yield and increase the difficulty of harvesting.

It is suggested that the areas with heavy precipitation should be drained in time to disperse water and create favorable conditions for machine harvesting. Autumn harvest crops mature areas, according to the local fine weather forecast, scientific scheduling of agricultural machinery, seize the precipitation gap in time to grab the harvest; In the harvest area, it is necessary to pay attention to the meteorological risk of crop germination and mildew in autumn. When the dry weather conditions are poor, measures such as ventilation, storage and drying should be taken to ensure the quality of autumn grain.

Effects of cloudy days on plant growth;

1. Continuous rainy weather in spring leads to a sudden drop in temperature and a decrease in ground temperature, which is obviously not conducive to the germination of crop seeds and may induce seed mildew. In severe cases, the embryo of the seed may be frozen, or the newly sprouted seedlings may be frozen.

2. If it is in summer, the growing crops need good photosynthesis to grow healthily, form strong plants and promote flowering and fruiting.

3. Weak light on cloudy days will reduce the intensity of photosynthesis of plants, and long-term rainy days will reduce the dry matter yield of plants.

4. Cloudy days only blocked some light and weakened photosynthesis, but it didn't stop. In winter in southwest China, the sun is often not seen for ten and a half months, and crops are growing, but poor light and heat conditions will affect the harvest.

5. When it is cloudy, it can still heat up during the day, indicating light transmission and heat conduction. The demand of crops for light and heat is not as much as possible, and tropical agriculture is underdeveloped.