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安庆地区位于东径115°46′～117°44′,北纬29°43′～31°15′之间.年平均气温16.5℃,无霜期240天左右,年雨量1200～1400毫米,其中4～8月的雨量约占全年雨量的70%;大别山区的岳西等县,年平均气温14.5℃,无霜期180～200天,年雨量1500毫米左右.自六十年代后期起,全区双季稻的栽培面积稳定在230万亩上下,单季晚稻约10万亩,中稻20万亩.一般丘陵和圩畈区都以栽培双季稻为主,少数社队混栽单季晚稻,其中“一肥两稻”的面积占70%以上;大别山区则以栽培一季中稻为主. 1970年以前,我区褐稻虱发生很少,进入七十年代后,褐稻虱的为害渐趋严
Anqing is located between 115 ° 46’-117 ° 44’east and 29 ° 43’~31 ° 15’north latitude with annual average temperature of 16.5 ℃, frost-free period of 240 days and annual rainfall of 1200 to 1400 mm, of which 4 to 8 Monthly rainfall accounts for about 70% of the annual rainfall; the Yuexi County in the Dabie Mountains, the annual average temperature of 14.5 ℃, frost-free period of 180 to 200 days, annual rainfall of about 1500 millimeters since the late 1960s, the region double cropping rice Of the cultivated area stabilized at about 230 acres, about 100000 acres of single season late rice, 200000 acres of middle rice.General hilly and fairy areas are cultivated double cropping rice, a few commune mixed planting single season late rice, where A fat two rice "accounted for more than 70% of the area; the Dabie Mountains is the cultivation of a quarter of rice-based .1970 years ago, I rarely brown planthopper occurred in the seventies, brown planthopper r