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本研究用早、中、晚稻41个品种,于早、中、晚季在自然和人工控制光长(11.5～24.0小时,分为13级)共14级光长处理下,观察了各类型品种出穗临界日长的情况表明;品种出穗临界日长,早稻和中稻品种在24:00(时:分,以下同)光照连续处理下,可正常出穗,不受光照长短影响,属中间性类型。晚稻早熟和中熟品种出穗临界日长,大多数是在13:10～14:10之间,属短日性类型。极少数品种在24:00可出穗,它们的出穗日数反比之在14:30下的出穗日数少,具有两面性的光周期性的反应。晚稻迟熟品种出穗临界日长为12:50～13:10,属短日性类型。品种出穗日长反应曲线,早稻和中稻是直线型,晚稻早熟品种是“S”字型,晚稻中熟和迟熟品种是“V”字型。品种感光性早稻、中稻最弱;晚稻早熟品种强、中熟品种较强、迟熟品种最强。品种的感温性是早稻弱的多,中的少;中稻是弱或中;晚稻在自然和短日下的感温性强至最强。品种短日高温生育期是早稻中,中稻长,晚稻最短。早稻和中稻对日长适应范围广,异地引种易成功。晚稻对日长适应范围狭,引种选择要严格,
In this study, 41 varieties of early, middle and late rice varieties were used to study the effects of natural and artificial light length (11.5 ~ 24.0 hours, divided into 13 grades) The results showed that the critical day of emergence of the ear was at the critical day of heading. The early and late rice varieties could be normally sprouted at 24:00 (hour: minute, the same below) under the continuous light treatment without influence of light length, Sexual type. Late maturity and maturity of late maturity varieties of rice at the critical day of long, most of them between 13:10 to 14:10, is a short-day type. A handful of cultivars can be spawned at 24:00. Their earning days are inversely proportional to their earring days at 14:30, with a two-sided photoperiodic response. The late maturity of late rice varieties out of the critical duration of the day 12: 50 ~ 13: 10, is a short-day type. Variety of heading out of the long reaction curve, early rice and middle rice is a straight line, late rice varieties are “S” shape, late rice varieties and maturity are “V” shape. The varieties of sensitive early rice and middle rice were the weakest. Late rice had stronger varieties of early maturity, stronger maturing varieties and strongest late maturing varieties. The sensible temperature of varieties is much weaker in early rice, and less in middle rice. The middle rice is weak or middle; the sensibility of late rice under natural and short days is strongest. Short-term high-temperature varieties of early growth period, early rice, rice is the shortest. Early rice and medium rice adapt to a wide range of long, easy to introduce remote places. Late rice adapt to the narrow range of Japan, the introduction of choice should be strict,