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Effect of LED inter-lighting on photosynthetic photon flux density (PPFD) along the profile of tomato plant canopy (top, middle, and lower canopy). PPFD was measured by using a quantum sensor positioned at the inclination angle of representative canopy leaves near the point of measurement. Data represent means ± SE (n = 10). For each canopy level, different letters indicate statistically significant differences (t-test at P < 0.05).
