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Christopher J. Currey and Roberto G. Lopez

primary driver of photosynthesis. Solar photosynthetic DLI is at seasonally low levels in the Northern Hemisphere during peak propagation of ornamental bedding plants. Further reductions in the solar DLI from greenhouse structures and shading reduce the

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Christopher J. Currey, Veronica A. Hutchinson, and Roberto G. Lopez

summer market demand for flowering bedding plants, cuttings are typically rooted in mid- to late winter and early spring when ambient outdoor DLIs are at seasonally low levels ( Korczynski et al., 2002 ). Further reductions in greenhouse DLIs often result

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Ariana P. Torres and Roberto G. Lopez

and Runkle, 2008 ; Pramuk and Runkle, 2005 ; Styer and Koranski, 1997 ). Photosynthetic DLI is an important environmental parameter closely related to growth and quality of greenhouse-grown crops. In the northern part of the United States during

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Katherine F. Garland, Stephanie E. Burnett, Lois B. Stack, and Donglin Zhang

Greenhouse production of coleus generally occurs between the months of February and May in the United States to coincide with spring bedding plant sales. Mean outdoor daily light integrals (DLIs) at this time of year in the northeastern United

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Veronica A. Hutchinson, Christopher J. Currey, and Roberto G. Lopez

finish container where they are grown until they become marketable ( Klopmeyer, 2003 ). Vegetative propagation of bedding plants occurs from mid to late winter and early spring when average daily ambient photosynthetic DLI is typically low, especially in

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W. Garrett Owen, Qingwu Meng, and Roberto G. Lopez

ornamental crops. The photosynthetic DLI is the accumulated photosynthetic photon flux density [ PPFD (400–700 nm)] in 1 d. A DLI increase from 5 to 20 mol·m −2 ·d −1 can hasten flowering and increase flower number and dry mass of plants such as petunia ( P

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David Llewellyn, Youbin Zheng, and Mike Dixon

recorded PAR measurements are integrated over each daylight period to form DLIs (moles of photons per square meter per day). DLI accounts for the temporal fluctuations in PAR measurements, taken at fixed locations, due to variable weather patterns and

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Dave Llewellyn, Katherine Schiestel, and Youbin Zheng

average (± se ) SL PPFD was 55.9 ± 0.47 µmol·m −2 ·s −1 , with no differences between treatments ( Table 1 ). With an 11.5-h photoperiod, the SL daily light integral (DLI) was 2.3 mol·m −2 ·d −1 . Table 1. Uniformity distribution of supplemental

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W. Garrett Owen and Roberto G. Lopez

spring, or spring to summer is 12, 10, and 8 weeks, respectively (M. Goyette, personal communication). Therefore, reduced crop time from spring to summer is consistent with previous research indicating that increased DLI during root development increases

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Elisa Solis-Toapanta and Celina Gómez

. In addition, basil can be used as an ornamental or medicinal plant, increasing its appeal to indoor gardeners ( Barbalho et al., 2012 ; Dou et al., 2018 ). Recommended DLIs for commercial basil production range between 13 and 35 mol·m ‒2 ·d ‒1