Distribution of the Top-Dressing Nitrogen (<15>^N) in Soybean Plant on Paddy Field Rotated to Upland as Affected by Irrigation

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  • 温暖地転換畑におけるダイズの追肥窒素(<15>^N)の吸収・分配に対する灌水の影響
  • 温暖地転換畑におけるダイズの追肥窒素(15N)の吸収・分配に対する潅水の影響
  • オンダンチ テンカンバタ ニ オケル ダイズ ノ ツイヒ チッソ 15N ノ

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Soybean plants (Glycine max L. Merr. var. Akishirome) were cultivated on paddy fields and were rotated to upland fields during various periods of years. The ^15N top-dressing was applied to the soybean plants at the different stages of growth under irrigation and non-irrigation, to identify the effect of the irrigation on absorption, translocation, distribution, and contribution of the nitrogen in soybean plants. The yield of the soybean under irrigation was greater than that under non-irrigation. But the effect of top-dressing nitrogen on the yield out as follows: the increase of pod number as the sink activity of carbon and nitrogen, and the increase of leaf area index as the source activity of carbon. The percentages of absorption (45%) to the plant and distribution (88%) of the top-dressing nitrogen to the seeds at late flowering stage under irrigation were higher than that of non-irrigation (40 and 81%, respectively). The percentages of the top-dressing nitrogen found in the seeds at maturity were 4 to 7% of the nitrogen taken up by soybean plants. The profitable time of the nitrogen top-dressing under irrigation was the late flowering stage or pod growing stage, because of high yield and high efficiency of nitrogen utilization by the soybean plant.

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