本邦における導入アゾラの生育について

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書誌事項

タイトル別名
  • The Growth of Introduced Azolla in Japan.
  • ホンポウ ニ オケル ドウニュウ アゾラ ノ セイイク ニ ツイテ

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説明

The research on Azolla use in Japan has been limited to two indigenous species. We introduced about 50 strains from Azolla Germplasm Collection of the International Rice Research Institute. The growth of these introduced ones was studied at Mie by water and soil cultures. To evaluate growth performance in water culture (from June 1992 to July 1993), fresh biomass increase was measured during consecutive two or three weeks by inoculating a known quantity of Azolla every week. Average daily fresh weight increase during a week was compared. Growth was most active from spring to early summer, followed by its retardation in summer. Growth in autumn did not come back to the level before summer. In winter, the growth almost ceased. Some hybrid (A. microphylla×A. filiculoides) strains gave the highest averages in biomass production (55g fresh weight m-2day-1) . The growth was highly related to air temperature. When average daily maximum temperature was above 30°C, the maximum values in biomass production decreased. When this was below 10°C, the growth almost ceased. The optimum temperature of A. filiculoides was lower than that for other species. Nitrogen contents increased as growth rate increased until 50-70g m-2day-1. In soil culture, similar seazonal pattern was observed. A. filiculoides was also less tolerant to high temperature. Sporulation was observed in twenty six strains grown in soil culture, being active in Sep.-Dec. and May These results provide useful information for introducing Azolla in Japan.

収録刊行物

  • 熱帯農業

    熱帯農業 40 (3), 123-130, 1996

    日本熱帯農業学会

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