Cold dew refers to the low temperature weather with a daily average temperature below 20 °C for more than 3 consecutive days in September, which is a severely severe weather in the late growth period of late rice. The cold dew wind mainly affects the heading and flowering process of the double-season late rice, which often leads to the neck, the Yinghua is not open properly, and the pollination and fertilization obstacles occur, resulting in an increase in the empty shell rate and a serious impact on the yield.
To prevent and mitigate the hazards of cold dew on late rice, in addition to the precautionary measures such as selecting cold-tolerant varieties, rationally arranging sowing dates, and cultivating strong sorghum, we must pay close attention to the weather conditions during the late rice heading and flowering, once the "cold dew wind" appears. Weather, take immediate measures to comprehensive defense:
1. Fill deep water insulation. Insulate 7 to 10 cm of deep water before the arrival of the cold dew wind, and gradually drain after the cold dew wind.
2. Spread the grass ash. Apply a certain amount of grass ash 1 to 2 days before the cold dew winds.
3, foliar spray fertilizer. On the day before the onset of cold dew, 200 grams of potassium dihydrogen phosphate or other foliar fertilizer was applied to 75 kg of water per acre to promote the growth of roots, stems and leaves of late rice, enhance stamina, and increase seed setting rate and 1000-grain weight.
4. Spray "92". Before and after the cold dew, the late rice with irregular heading is sprayed with 1 to 2 grams of "nine-two" per grain or 50 kilograms of water with a grain of 50 kilograms, which can effectively eliminate the neck of the hybrid rice. .
5. Control pests and diseases. After the cold dew wind, some of the seedlings will be damaged by mechanical damage or even fall, which is likely to cause damage to pests such as rice planthoppers. Therefore, it is necessary to pay close attention to the occurrence of pests and diseases, and do a good job in the prevention and control of pests and diseases.
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