Due to the delay in the early rice harvest period in the southern region in 2010 , the late rice transplanting was late, and the growth period was generally postponed, which increased the chance of encountering cold wind wind damage during the late rice heading and flowering stage. At present, the late rice in the Jiangnan area is generally in the tillering stage, and the growth period is 6 to 15 days later than normal . Most of the southern part of China is in the tillering stage, and the growth period is 4 to 10 days later . According to late development of forecasting model predicts that rice heading south: Hubei rice to September 6 to September 10; most of Hunan, Jiangxi most, southern Anhui, Zhejiang west to September 11 to September 20 ; Zhejiang in the east, west Fujian, northern Guangdong, the southern parts of Hunan for the September 21 to September 30; eastern Fujian, Guangdong, central and southern Guangxi, most, Hainan is October 1 to October 5.
　　 Forecast of the trend of southern cold dew activity from September to October
According to the China Meteorological Administration Climate Prediction, between September 2010 and October activities northern cold air forces in general is weak, the South cold dew wind weather and late start time than normal, lighter degree. Jiangxi, Guangdong and Guangzhou southwest of mild cold dew wind appeared a bit earlier than usual, in northern Guangdong and Guangxi and Hunan, Zhejiang, Fujian and late than normal; Jiangxi, Fujian, Guangdong, Guangxi severe cold dew wind appeared and late period were above normal, Early in Zhejiang, there is no heavy cold wind in Hunan . The forecast results of the occurrence of cold dew in various provinces are shown in the attached table.
Concerns and suggestions
According to the forecast of the date of cold weather and the prediction of the growth period of late rice, most of Hunan, the majority of Jiangxi, southern Fujian, central and southern Guangdong, most of Guangxi, and Hubei and Anhui late rice growing areas are less likely to encounter cold weather during the flowering period. conducive to safety full heading, seed rate; may experience mild cold dew wind weather in Zhejiang, Fujian and north-central and northern mountainous areas in Guangxi during Jiangxi, Guangdong border zone heading and flowering, it will have an impact on rice seed. The southern rice fields in the south need to pay close attention to the weather changes. Before the cold air comes, they should adopt irrigation, spraying chemical insulation agents and topdressing measures to keep warm and cold, improve the microclimate of rice fields, and reduce the damage of cold wind.
Note: " Cold dew wind " refers to a kind of severe weather caused by the low temperature causing the heading and flowering to be blocked and the empty shell rate to increase due to the low temperature . It is called the cold dew wind before and after the " cold dew " .
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