Effect of Sodium Application on Chlorophyll Concentration, Dry Weight and Nitrogen Metabolism of Rhodesgrass (Chloris gayana KUNTH.), Italian Ryegrass (Lolium multiflorum LAM.) and African Millet (Eleusine coracana (L.) GAERTN.)

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  • OYAMADA Masayuki
    Department of Grassland Science, Faculty of Agriculture, Miyazaki University
  • IKEDA Hajime
    Department of Grassland Science, Faculty of Agriculture, Miyazaki University

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  • ローズグラス(Chloris gayana KUNTH.),イタリアンライグラス(Lolium multiflorum LAM.),シコクビエ(Eleusine coracana (L.) GAERTN.)のクロロフィル濃度,乾物重及び窒素代謝に及ぼすナトリウムの影響
  • ローズグラス Chloris gayana Kunth.イタリアンライグラス

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Rhodesgrass (Chloris gayana KUNTH.), Italian ryegrass (Lolium multiflorum LAM.) and African millet (Eleusine coracana (L.) GAERTN.) were grown in culture solutions without sodium (Na) and potassium (K), and with 1.2me/l Na (as NaCl) or 1.2me/l K (as KCl) for 5 days and evaluated in terms of chlorophyll concentration in leaves, dry weight of plant tops, and constituent and content of nitrogen (N). Following results were obtained; The chlorophyll concentration in leaves of each species increased steadily in course of time after receiving K treatment. The chlorophyll concentration in leaves of Rhodesgrass clerarly increased after reciving Na treatment and reached about 1.7 times as much as that of the Na and K deficient plants by the 5th day. Also the chlorophyll concentration in leaves of Italian ryegrass gradually increased after receiving Na treatment. However, no increase was observed for African millet. Rhodesgrass plants alone showed a distinct increase in dry weight of plant tops by receiving Na treatment. Proportions of ammonia-N, amide-N and amino-N to total-N contents in plant tops of each species decreased by an addition of K. In contrast to this, proportions of nitrae-N and protein-N increased by an addition of K. This tendency was also observed in Rhodesgrass and Italian ryegrass plants which received Na treatment.

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