Abstract
With the increase in consumption of natural resources and energy, global environmental problems have appeared. On one hand, by eco-systemic agriculture, environmental preservation, and energy saving measures, the establishment of innovative techniques for year-round stable production of high-quality vegetables in green houses has been expected. On the other hand, the deterioration of water in the environment leads to an increase in health hazards because of active oxygen in living organisms, and raising the quality of water is an important issue to be addressed. In this study, efficient approaches to managing nutrient solution were developed. The upper and lower sides of a fluidized layer are sectioned with stainless steel nets. Sintered silicate mineral ceramics were inserted into the section. The flow of nutrient solution can be directed using a pump from the lower to the upper side so that the ceramic particles are fluidized. The nutrient solution allowed to flow through the fluidized layer would be fed back into a nutrient solution tank, and a structured nutrient solution with antioxidation property is induced by electrokinetic treatment. The nutrient solution was found to become positively charged by the formation of an electric double-layer interface between the ceramic surface and the nutrient solution. The structured nutrient solution was studied under thermally stimulated depolarized current (J), temperature profiles (TSDC analysis), and viscosity. Effects of surface activity were seen in the structured nutrient solution at similar temperature conditions. Effects of structured nutrient solution on plant growth were examined in Komatsuna (Brassica rapa L. nothovar) plants growing under NFT system. The structured nutrient solution was efficiently absorbed on contact with roots and the root mass significantly increased. Komatsuna plants grew fast and a larger root mass contributed to an increase of total free amino acid in leaves.
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