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Stem diameter a, diameter enlargement rate b, stem length c, stem elongation rate d, stem fresh weight e, and stem dry weight (f) of tomato plants under different sink demand treatments for two tomato greenhouse cultivars. Mean values ± standard error (SE) for each variable with the same upper-case (for sink/source ratios) or lower-case (for cultivars) letters are not significantly different at P ≤ 0.05 by the least significant difference (LSD) test
