Studies on blooming in rice
1934
Adair, C.R.
The number of days required for the blooming of all flowers on a panicle and the hour of blooming appear to depend primarily upon the variety, the atmospheric temperature, the intensity of sunlight, and probably other climatic conditions. The blooming of Fortuna and Caloro was completed in fewer days and over a shorter period each day than that of Colusa, Early Blue Rose, and Edith. Edith bloomed at a faster rate the first day than did the other varieties. The rate of blooming was most rapid during the first 4 days of the blooming period, and the maximum number of flowers bloomed on the second or third day. None of the flowers observed bloomed before 8 a.m. or after 4 p.m., and the maximum rate of blooming was between 10 a.m. and 1 p.m., being very fast at about 12 noon, except for Fortuna in 1931 and Edith in 1933. Uniform temperatures were conducive to a rapid rate of blooming. With high afternoon temperatures the number of Caloro flowers that bloomed did not increase as did those of Early Blue Rose and Edith. Blooming started early in the day when the temperatures were high and materially slowed down when the sky became cloudy and the temperature dropped. On cool, clear days the flowers started to bloom late in the morning and continued to bloom until rather late in the afternoon. Late in the fall, rice flowers often bloom at low temperatures but set very few seeds. Most varieties started and stopped blooming earlier in the day when the humidity was high than when it was low; however, the effect of humidity was not so marked as that of temperature. Pollen was shed just before or at the time the flowers opened.
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