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Fundamental studies on the growth and regeneration of sasa tectorius

, : Fundamental studies on the growth and regeneration of sasa tectorius. Bulletin of the Tottori University Forests (10): 1-12

The effect of shading on the growth of Sasa (S. tectorius Makino) regenerated after weeding, and the regeneration of seedlings after unusual mass flowering were studied. Although S. tectorius grew from April to Aug. the growth in June was most vigoruous. The content of reserve starch in the rhizome showed a corresponding contrary change of growth in length and it was lowest in Aug. Height, leaf area and top weight per plant increased with the decrease of relative light intensity and attained the maximum at 18% day light. S. tectorius died under 1% day light. The ratio of leaf area of leaf weight increased with the decrease of relative light intensity. The amount of reproduction of top per m2 after cutting decreased by the repeat of cutting, and it also decreased with the decrease of relative light intensity. GA3 did not promote flowering but accelerated culm elongation. The regeneration of Sasa seedlings after unusual mass flowering was investigated in 5 regions of Japan in the years 1975 and 1976. Although the number of seedlings regenerated varied with region and stand, 20-97 seedlings per m2 were found in the next year of flowering. The mortality of seedlings was larger during the winter period than during the summer period, the average mortality in the winter period being 27%. The elongation of seedlings differed with stand. The height of 2 yr old seedlings was 9.6-16.9 cm, and the elongation during 1 yr, 3.1-8.5 cm.


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