一、前言推广和发展双季稻,是当前我省增产粮食的一个重要措施。解放后,特别是农业学大寨运动开展以来,我省广大贫下中农和农业技术人员,在毛主席革命路线指引下,战天斗地,克服了各种不利条件,创造了许多宝贵经验,使双季稻播种面积逐年增加,粮食产量大幅度上升。水稻是一种感温性作物,对温度的反应比较敏感,热量条件为影响水稻生长发育的重要因素之一。从热量资源与双季稻的生育关系来看,最突出的矛盾表现在:早稻能否适时播种;晚稻能否安全齐穗;从早稻适播时段起到晚稻安全齐穗期止的持续日数,能否满足从早稻播种到晚稻齐穗的时间要求。 I. Preface The promotion and development of double cropping rice is an important measure for increasing grain output in our province at present. After the liberation, especially since the launch of the Dazhai Agricultural Movement, the vast majority of poor and middle-level peasants and agricultural technicians in our province, under the guidance of Chairman Mao’s revolutionary line, fought the war and overcome various unfavorable conditions, creating many valuable experiences that double-cropped rice Sowing area increased year by year, grain output increased significantly. Rice is a temperature-sensitive crop that is sensitive to temperature and one of the important factors that affect the growth and development of rice. Judging from the relationship between caloric resources and the fertility of double cropping rice, the most prominent contradictions are: whether the early rice can be sown in time, whether the late rice can be kept at full capacity, the number of sustaining days from the suitable period of early rice to the safe heading of late rice, Can meet from the early rice planting to late rice full heading time requirements.