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KMID : 0368419710140030021
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Journal of Plant Biology
1971 Volume.14 No. 3 p.21 ~ p.28
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On the Growth and Total Nitrogen Changes of Glycine max. Artificial Plant Communities, Grown in Sandy Loam Soil with a Controlled Moisture Content
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Abstract
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Dry matter production, leaf area growth and total nitrogen changes were studied in Glycine max. soybean communities, which were grown in sandy loam soils controlled to provide various moisture levels, i.e., 5-7%(level 1), 8-10%(level 2), 11-l3%(level 3), 14-15%(level 4), 17-20%(level 5) and 22-24%(level 6).
A summary of the results is shown. The maximum dry matter production of leaves, stems and nodules and the maximum leaf area per unit area were at level 5, but the maximum of root dry matter production was at level 4.
Total nitrogen content of the soybean plant decreased with growth, but each level of soil moisture content also showed a little difference. Water content of the plant decreased with plant age and soil water deficiency, especially in roots and nodules.
Nodule formation increased in proportion to soil moisture content. Total nitrogen content of the soil on which the soybeans grew, increased from 0.23% before sowing to 0.30% at 100 days after sowing.
It seems that soil water content acts as a linear factor in the elongation or dry weight increase of shoots and roots until increasing to level 5. Considering the pattern of plant growth through analysis of the shoot and root dry weight ratio, or the photosynthetic organ and non-photosynthetic organ dry weight ratio, the asymptote of plant growth at a high soil water content exceeded that at a low soil water content.
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