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Does hydroponic lettuce have less nutrients?

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In yet another study by Drew N. Buchanan and Stanley T. Omaye, 2013, results showed that lettuce grown hydroponically had more Vitamin C than the variety grown in soil. In this study, the soil type used had no reference other than it was a “non-commercial enriched with naturally composed materials” soil.
Craig Witthaus is an artist in White Bear Lake, Minnesota. He has been sailing since he was five years old, and his sailing experience shows in the authentic design of the boats and hydroponics and “set” of the sails in his work. He has settled on oil painting as his primary medium, with a focus on landscapes, gardens and sailing themes. Also we have answers about gardening and hydroponic systems.