Effects of solution cooling and shading treatments on quality and growth of hydroponic Takana

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  • 水耕タカナの品質と生育に及ぼす培養液冷却処理および遮光処理の影響

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Abstract

In this study, solution cooling and shading were applied to hydroponic takana (Brassica juncea var. integrifolia) just before harvest to investigate their effects on quality and growth. It was suggested that the nitrate nitrogen content of takana leaves could be reduced, and the sugar content could be increased by continuous day and night solution cooling treatments. The effects of the solution cooling treatment on ascorbic acid content were not significant. In addition, the nitrate-nitrogen content was reduced when the fertilizer content in the solution was reduced, but the appearance quality was also decreased. On the other hand, nitrate-nitrogen content increased, and ascorbic acid content and sugar content decreased when the seedlings were shaded. Long-term shading treatment suppressed the growth of the seedlings, suggesting the possibility of improving the quality of the takana plants.

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