Studies on improvement of constituents related to spinach [Spinacia oleracea] quality in hydroponics
2004
Yasuda, M.(Gifu-ken. Research Inst. for Agricultural Sciences (Japan)) | Koshikawa, K. | Suzuki, I. | Shimohata, T.
We investigated the prosperity and decline of ascorbic acid, nitric acid and (water-soluble) oxalic acid in spinach under various cultivating conditions to develop ultimate culture method improving the contents of the constituents in NFT hydroponics. It is the improvement method to limit supply times of nutient solution at about 15cm of leaf length and change the rate of NO3-N : NH4-N in nutient solution from 16: 1.3 (control) to 0:1 about one week before harvest. The content of ascorbic acid increases more than 130% from control, and that of nitric acid decreases more than 60%, while the content of (water-soluble) oxalic acid decreases depending on cultivar.
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