THE ROLE OF MACRONUTRIENTS IN CABBAGE-HEAD FORMATION : IV. Effect of Nitrogen Supply or Light Intensity on the Growth and ^<14>CO_2 and ^<15>NO_3-N Assimilation of Cabbage Plants
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概要
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Cabbage plants were grown under graded levels of nitrogen supply in nutrient solution (5, 50, 500 ppm N) or graded levels of light intensity (100, 61, 34 % of natural light), and the effects of each treatment on the growth and ^<14>CO_2 and ^<15>NO_3-N assimilation of the plants were studied. As the nitrogen supply increased, the plant dry weight increased from 5 to 50 ppm N and decreased at 500 ppm N. Plants grown at 50 ppm N had the highest sugar content and the highest rate of ^<14>CO_2 assimilation. This was why efficient cabbage-head development occurred at 50 ppm N. As the light intensity decreased, so the plant dry weight and the cabbage-head yield decreased, resulting from a decrease in the sugar content and in the rate of ^<14>CO_2 assimilation. The ^<15>NO_3-N uptake by the plants was smaller at a low light intensity than at a high light intensity, and in the plants at the low light intensity the incorporation of ^<15>N into the 80% ethanol-insoluble fraction in the cabbage-head was impaired. The later the growth stage, at which ^<14>CO_2 was assimilated by the plants, the greater was the ^<14>C-retention percentage at harvest time and the distribution of ^<14>C into the cabbage-head. The ^<14>C-retention percentage decreased with increase in the nitrogen supply or decrease in the light intensity.
- 社団法人日本土壌肥料学会の論文
著者
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Hara Tetsuo
Faculty of Agriculture, Gifu University
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Sonoda Yoji
Faculty of Agriculture, Gifu University
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Sonoda Yoji
Faculty Of Agriculture Gifu University
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Hara Tetsuo
Faculty Of Agriculture Gifu University
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