Are short days required for flowering?
No, but it would hasten flowering. According to the CRC Handbook, cultivars differ in the timing of their photoperiod sensitivity, and in their optimum photoperiod. Nine to ten hours was suggested as an optimum during the period of sensitivity. It should be noted that Summerfield et al., (1991), suggests that japonica rice is less sensitive to photoperiod than indica rice. We chose not to apply short-day treatments because of the labor scheduling it would require. In a greenhouse, short days are applied by pulling black-out fabric around the plants to ensure dark conditions. In our experiment, flower panicles emerged on day 93.
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