The results revealed that all polyphenols showed an increasing trend in their relative abundance in lettuce, while the maximum relative abundance of all of the above-mentioned polyphenols in lettuce was observed in the control in the substrate and hydroponic systems.
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Differential Metabolic Responses of Lettuce Grown in Soil, Substrate and Hydroponic Cultivation Systems under NH<sub>4</sub><sup>+</sup>/NO<sub>3</sub><sup>-</sup> Application.
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