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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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Zhengnan Yan, Dongxian He, Genhua Niu, Qing Zhou, and Yinghua Qu

combination of white and red lights from sole-source LEDs for lettuce production were not yet determined by previous studies. Daily light integral is the total amount of light received by plants in 1 d ( Bruggink and Heuvelink, 1987 ; Kozai et al., 2018

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Marietta M. Loehrlein and Richard Craig

Nine cultivars of Pelargonium ×domesticum L.H. Bailey were evaluated for the effect of daily light integral on floral initiation. Plants were grown at four daily light integrals: 5, 10, 15, or 20 mol·m-2·d-1 for a 16-hour photoperiod in environmental growth chambers at constant 15.5 °C. Meristems were examined at 50 mol·m-2 intervals for morphological changes associated with floral initiation. Two phenotypes were identified, cultivars with an association between floral initiation and cumulative irradiance and those with association between floral initiation and chronological time. Genotypic variation was observed among the irradiance-associated phenotypes.

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James E. Faust and Joanne Logan

Daily light integral is a measure of the total photosynthetic photon flux ( PPF ) density delivered over the course of 1 day. This measurement has proven to be an extremely useful tool for assessing the irradiance delivered to various horticultural

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Ariana P. Torres and Roberto G. Lopez

. Sowing and harvest dates, mean photosynthetic photon flux ( PPF ) provided by high-pressure sodium lamps, shadecloth percentage, mean daily light integral (DLI), and leaf and air temperatures during 5 weeks of Tecoma stans seedling propagation. Effects

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Christopher J. Currey and John E. Erwin

decreased by 1.1 nodes as the DLI increased to 17.2 mol·m −2 ·d −1 ( Table 1 ). There was no effect of DLI on the node number below the terminal inflorescence of K. lacinitata and K. velutina ( Table 1 ). Table 1. Effect of daily light integral (DLI) on

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Wook Oh, In Hye Cheon, Ki Sun Kim, and Erik S. Runkle

, which includes Korea, the northern half of the United States, and Europe), the mean photosynthetic daily light integral (DLI) can be a limiting factor in the production of many greenhouse crops during the winter and early spring ( Faust, 2003 ). The DLI

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David A. Baumbauer, Colleen B. Schmidt, and Macdonald H. Burgess

Growers of leafy greens in mid-latitude (40–50°) high tunnels who wish to extend their growing season past mid-autumn are faced with two significant challenges: low air temperatures, primarily at night, and low daily light integral (DLI) due to

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Jennifer M. Evans, Veronica A. Vallejo, Randolph M. Beaudry, and Ryan M. Warner

application. Table 1. Average daily light integrals (DLI) with standard deviations, DLI minimum and maximum for each treatment and 24-h mean temperature (°C) with standard deviation for each DLI treatment created with shadecloth over two periods in Michigan

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Annika E. Kohler and Roberto G. Lopez

the photosynthetic daily light integral (DLI). During peak propagation in northern latitudes, the DLI can be as low as 2 mol·m −2 ·d −1 inside a greenhouse due to seasonal short days, low ambient radiation levels, and greenhouse glazing and