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桐城地区位于东经一百一十六度五十六分,北纬三十一度零三分,全年无霜期二百一十天左右,年平均温度十六度(摄氏)左右。原为一季中稻地区,自一九五五年推广双季稻以后,双季稻栽培面积年年增加;双季稻收成比一季中稻加晚秋显著增产。一九五八年计种双季早稻四十五万三千多亩,占水田总面积(六十三万亩)的百分之七十一点九,比一九五七年扩大了百分之四十点五。因此要将早稻达到早播、早插,获得双季稻全面丰收的要求,提早安全育秧,便成为双季稻栽培技术上的首要问题。
The Tongcheng area is located at 116 degrees east longitude and 31 degrees north latitude. The annual frost-free period is around 210 days. The annual average temperature is about 16 degrees centigrade (Celsius). It was originally a mid-season rice region. Since the promotion of double-crop rice in 1955, the area under double-crop rice cultivation has been increasing year by year. Double-crop yields have significantly increased as compared with the middle-season and late-autumn seasons. In 1958, a total of 453,000 mu of double-cropped early rice was planted, accounting for 71.9% of the total paddy field area (630,000 hectares), an increase of 19% over 1957 Forty-five. Therefore, it is necessary to reach early sowing and early sowing of early rice to achieve the requirement of full harvest of double cropping rice and to raise the seedlings safely in advance so that they will become the most important technical issue in double cropping rice cultivation.