First, the growth of the early crops
Since March, most of the areas along the Huaihe River and Huaibei in Anhui Province have suitable soil moisture, sufficient sunshine, and reasonable combination of light and temperature water, which is conducive to the restoration of growth and seedling transformation of the early winter wheat. The monitoring results of the seedlings in 32 counties and cities in the main winter wheat producing areas of Anhui Province showed that the winter wheat was in a general period of jointing, and the growth was good. The seedlings were better than the same period last year.
The rapeseed in the area south of the Huaihe River was affected by the low temperature and drought in the early stage, and the development period was generally postponed. At present, the rapeseed in the Jianghuai area has been successively flowering, and it is generally flowering in some areas, and it is generally flowering along the Yangtze River.
The early rice along the Yangtze River has not been planted in large areas, and only a few areas are in the seedling emergence stage.
2. The effect of cooling on winter wheat is small, which has certain influence on rapeseed and early rice breeding.
According to the forecast of the Anhui Meteorological Observatory, it is expected that the strong cold air will be affected from the north to the south on the 1st, and the wind will be cooled from north to south in Anhui Province. The northerly wind will increase to 4 to 5 and gust 7; Up to 8 ~ 10 ° C, accompanied by precipitation; cold air after the Huaihuai North and the mountains may appear frost or frost.
The cold resistance of winter wheat decreased after jointing, and the cold resistance of rapeseed at flowering stage was also weak. The cooling process has little effect on winter wheat, but the risk of frost damage to rapeseed is relatively large, especially along the Huaihe and mountainous areas, which may cause the flowering rate to reduce the buds falling off and the staged pods. At the same time, the weather of the wind and precipitation will also Causes falling flowers, folding moss or poor pollination.
The open-air sowing and raising of rice requires the average temperature to pass through 10~12 °C, and the temperature drop is large before and after April 2. It is extremely unfavorable for the sowing of the early rice in the open-air nursery field, and the field using the film mulching is not much affected.
Third, countermeasures and suggestions
To prevent or mitigate the adverse effects of the cooling process on crops, it is recommended that:
1. Pay close attention to meteorological information. In areas where frost may occur, watering measures should be taken before cold air is coming to reduce or avoid the damage of low temperature to winter wheat and rape.
2, early rice open-air breeding should be appropriately postponed sowing, after the temperature rises, seize the "cold tail warm head", and strive to plant seeds as soon as possible. The open-air nursery field should be irrigated at night and drained during the day to prevent frost damage.
3, the early rice that has been mulched in the film should pay attention to the cold-proof work during the cold air impact period, cover the Putian plastic film, extend the filming time, increase the application of hot phosphorus and potassium fertilizer, improve the cold resistance of the seedlings, and prevent the rotten species.
4. After the rain, it is necessary to clear the ditch in time to reduce the groundwater level and provide good environmental conditions for the later growth of wheat and rapeseed.
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