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朴愚喆,노-만 테리 慶北大學校 1990 論文集 Vol.50 No.-
This experiment was carried out to investigate effect of nitrogen cut-off treatment on growth status, leaf nitrogen concentration, photosynthesis and carbon partitioning in sugar beet(Beta vulgaris L. cv F58-554HI) under hydrophonics culture condition. The results obtained were as follows: 1. According to the concentration of nitrogen in nutrient medium the growth status was severely affected. However specific weight of one disc leaf was highest in no nitrogen treatment. It is believed that since plant has no enough nitrogen to synthesize new cell, the organized leaves cell of nitrogen cut-off treatment were more thickened than those of control treatment. 2. Photosynthesis of nitrogen deficient leaves was not incidentally decreased with nitrogen decrease. 3. Concentration of leaf soluble protein, nitrogen, total nitrogen in sugar beet treated with nitrogen cut-off was decreased proportionally with nitrogen concentration of nutrient medium. 4. In the nitrogen deficient leaves the concentration of glucose, sucrose and starch was remarkedly higher than those of nitrogen enough leaves. It seemed that the carbon partitioning was irregulated by the nitrogen deficient because the leaves could not use the carbon as sources to built new cell in the lack of nitrogen.