Improvement of Root Environment in NFT

1. 在NFT系统下，通过通道流动冷营养液可以促进草莓植株的花芽分化。并进行了商业基地试验。草莓植株在三层NFT通道下生长良好，通道高度为30 cm，冷营养液（10 C）或井水（17 C）均能促进花的形成。营养液低氮或缺氮处理下，油菜叶片中抗坏血酸含量高于正常营养液处理，而叶片产量相反。一般情况下，油菜叶片中抗坏血酸含量随衰老而降低。2 .不同膜下栽培的油菜和刺槐对葡萄糖和抗坏血酸含量的提高均无有利作用。在植物根系发育良好的条件下，拱形岩棉作为NFT通道中的培养基可改善营养液的流动。甘薯（Ipomoea batatas L.）在低弧度下产生贮藏根。

1. Promotion of flower bud differentiation in strawberry plants grown under NFT systems has been recognized with flow cold nutrient solution through the channel. Experiments to develop this technique for commercial base were tried. Strawberry plants grew well under three layers of NFT channels at 30 cm spacing in height and flower initiations were promoted with either cold nutrient solution (10ﾟC) or well water (17ﾟC).2. With low concentration or lack of nitrogen in nutrient solution ascorbic acid content in the leaves of Brassica campestris L. had higher than that with normal nutrient solution although the yield of leaves was vice versa. Generally ascorbic acid content in the leaves of Brassica campestris L. decreased with aging. There was no favorable effects to improve the glucose and ascorbic acid content in Brassica campestris L. and Spinacia cleracea L. plants grown under several kinds of film have different selection of spectrum.3. Arch rockwool as medium in channel of NFT improved the flow of nutrient solution if plant developed well the root systems. Sweet potato(Ipomoea batatas L.) produced the storage roots in air space under lower arc.