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Photon flux and leaf temperature effects on flower initiation and early development of red elite geraniums



Photon flux and leaf temperature effects on flower initiation and early development of red elite geraniums



Journal of the American Society for Horticultural Science 112(6): 945-950



Geranium (Pelargonium .times. hortorum Bailey 'Red Elite') seedlings were grown with five daily mean temperature (DMT) and daily light integral (DLI) treatment combinations: DMT of 23.degree.C/day at DLI of 8.64 mol .cntdot. day-1 .cntdot. m-2 (TI), DMT of 25.degree. at 8.64 mol (T2), DMT of 23.degree. at DLI of 17.28 mol, (T3) DMT of 25.degree. at DLI 17.28 mol (T4), and DMT of 21.degree. at 17.28 mol (C1). Using infrared thermometry to control leaf temperature, DMT had a greater influence on flower initiation at the transition stage and on flower bud development to macrobud stage than DLI. Seedlings in T4 reached transition stage 24 days after sowing with a cumulative irradiance of 415 mol. Transition occurred in T1 at 27 days from sowing, with a cumulative irradiance of only 233 mol. Some time after 27 days from sowing, transition occurred in T2, T3, and C1. With a DLI of 17.28 mol, a DMT reduction from 25.degree. to 23.degree. to 21.degree. effected macrobuds in 42, 56, or 62 days after sowing, respectively; whereas with a DLI of 8.64 mol, a decrease from 25.degree. to 23.degree. effected macrobuds in 54 or 51 days.

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