《Table 1 Photoperiod and daily integral of far-red (FR) light in the four treatments》

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《Overhead supplemental far-red light stimulates tomato growth under intra-canopy lighting with LEDs》

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The greenhouse was equally divided into four sections and each section included two growth gutters.Plants on outer sides of two gutters were considered as border plants.FR LED lines were installed 30 cm above the plant canopy in each section.Light intensity of the FR LEDs was 43μmol m–2 s–1 at 20 cm below the lamps with peak wavelength at 735 nm（Fig.1-B）.Photoperiod of the FR LEDs was different among sections，which resulted in four treatments（Table 1）.White curtains were applied between each treatment to avoid light disturbance by other treatments.