How to deal with cold dew wind in rice and how to control pests and diseases afterwards.

When rice meets the cold dew wind, the leaves are sprayed with regulators such as potassium dihydrogen ph

How to deal with cold dew wind in rice and how to control pests and diseases afterwards.

When rice meets the cold dew wind, the leaves are sprayed with regulators such as potassium dihydrogen phosphate, brassinolide, Bihu, etc., and at the same time, about 4-5 kg of compound fertilizer is applied per mu; In the evening, water the rice field with river water to a depth of about 6-8cm, or spray chemical heat preservation agent on the surface of rice leaves to reduce heat loss.

First, how to deal with rice in the cold dew wind

1, what is cold dew wind?

Cold dew wind refers to the low-temperature chilling injury that causes obvious cooling and rice yield reduction after the invasion of cold air in autumn, and generally occurs around the solar term of cold dew wind (65438+1early October). Because it is in the heading and flowering period of late rice at this time, once it lasts for more than three days, the average daily temperature is lower than 22℃, which is easy to cause empty shells and shriveled grains of late rice, resulting in reduced production. It can be divided into mild cold dew wind damage (the average daily temperature is lower than 22℃ for 3-4 consecutive days), moderate cold dew wind damage (the average daily temperature is lower than 22℃ for 5-6 consecutive days) and severe cold dew wind damage (the average daily temperature is lower than 22℃ for more than 7 consecutive days).

2, the processing method

(1) foliar spraying regulators such as potassium dihydrogen phosphate, brassinolide and Bihu to enhance the stress resistance of rice (45kg water per mu 100- 150g potassium dihydrogen phosphate); At the same time, apply about 4-5 kilograms of compound fertilizer per mu, or use 5-7.5 kilograms of urea and 5 kilograms of potassium chloride per mu to enhance root activity and leaf assimilation ability.

(2) Irrigation with high temperature water at night, with the water depth controlled at about 6-8cm. The water layer is used to reduce heat loss, thus increasing the surface temperature of paddy soil and reducing freezing injury. Empty the water in the field during the day.

(3) Spraying chemical heat preservation agent on the surface of rice leaves or in the water layer of rice field to reduce water evaporation, thus reducing heat loss and slowing down the cooling speed.

Second, how to control pests and diseases after the cold dew wind

1. At the heading stage of rice, 20% leaf wettable powder 100-125g, 90% rice125g or1100,000 units of agricultural streptomycin10g and 50 kg of water were used for control.

2. Use 36 ml of 40% fluorine ring per mu? Carbendazim SC or 15ml 30% benzamide? Spraying propiconazole or 80% tebuconazole wettable powder 8- 10g and adding 40-50kg of water to control sheath blight and false smut.

3. Control rice blast with 45g of 75% tricyclazole wettable powder and 40-50kg of water per mu.

4. Use 50% pymetrozine water dispersible granule 15g and 80% pymetrozine 8- 10g per mu? Spraying nitenpyram with 40-50kg water to control rice planthoppers and other pests.

5. Spraying 5% avermectin 100ml and 40% chloropropyl mixed water per mu to control rice leaf roller and Chilo suppressalis.