Metasequoia의 揷木에 關한 硏究(Ⅱ) : 揷木時期, 揷床庇蔭, 揷穗直徑을 中心으로 Especially on the Time of Cutting, Shading of Bed and Diameter of Cuttings = Studies on the Cuttings of Metasequoia(Ⅱ)

국문 초록 (Abstract)

揷木時期, 揷床庇蔭, 揷穗直徑이 메타세코이아의 揷穗發根率과 生長에 미치는 影響을 밝히고 아울러 揷木時期가 冬芽形成에 어떠한 影響을 미치는 것인가를 究明하기 위하여 1976年 全南大學校 農科大學 苗圃場에서 實驗을 實施하였던 바 그 結果를 要約하면 다음과 같다.
1. 庇蔭條件에서의 發根率은 發根促進劑 無處理區, IAA 處理區, Biotin 處理區가 共通的으로 비닐하우스 庇蔭區와 露地庇蔭區가 無庇蔭區보다 좋았으나 發根苗의 地上部 生長은 露地庇蔭區가 가장 좋았다.
2. 直徑級에서는 發根率과 生長量이 一律的으로 直徑 4∼6mm가 2∼4mm보다 좋았다.
3. 揷木時期別 發根律과 生長量은 4月 中旬을 지나면 떨어지는 結果를 나타낸다.
4. 夏揷의 冬芽形成은 NAA 25 ppm를 處理한 境遇 7月 24一이 가장 좋았으며 無處理는 8月 11日이 좋았다.

다국어 초록 (Multilingual Abstract)

In order to determine the effects of the time of cutting, shading of bed, and diameter of cuttings on the rooting and growth of Metasequoia (Metasequoia glyptostroboides Hu et Cheng) cuttings, this study was carried out at the Forest Nursery of Chonnam national University in 1976. For comparing those effects, three kinds of beds, such as polyethylen film house with shading, outdoor bed with shading and outdoor bed without shading were prepared. And the effect of time of cutting on the winter bud formation was also investigated.
The results obtained were summarized as follows;
1. Rooting was significantly better both in polyethylen film house with shading and in outdoor bed with shading than in outdoor bed without shading in the cuttings made on April 1 and April 12.
2. Shoot growth of cuttings, however, was better in outdoor bed with shading than in those other two beds.
3. Cuttings of 4-6 thick in diameter exhibited significantly better rooting and growth than those of 2-4 thick in diameter.
4. The poor rooting and growth occured in cuttings made after mid-April.
5. Winter bud formation of softwood cuttings was better in the cuttings made on July 24 when 25 ppm NAA was treated, while, without NAA treatment, it was better in the cuttings made on August 11.