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Effect of management allowable depletion levels (MAD%) on the concentrations of (A) caffeic and (B) caftaric acids content in green leafy lettuce varieties Vera and Lollo Bionda on dry weight basis. Management allowable depletion levels (MAD%): 25% (control), 50%, and 75%. Means in each bar for a specific parameter with the same letter are not significantly different at p < .05, Fisher's least significant difference (n = 12)
