Studies on the vegetative propagation by cuttings of the Mulberry (Morus australis Poir.) cultivar, Tai-Song No. 2 and No. 3 (I)(Department of Forestry)

クワの優良品種Tai-Song No.2とNo.3について, さし木繁殖を向上させる目的で行なったものである。本実験では当年生の萠芽枝を用いて, さし穂の特性別, さし付用土別, 薬剤処理別に, ガラス室内に設置されたミストボックスを利用して, 1981年9月4日さし付け, 1981年11月4日掘取り調査を行なった。実験の結果, Tai-Song No.3はNo.2より発根率においてすぐれていた。また, 無着葉木質枝を長さ15cmに穂ごしらえしたさし穂は, その他の部分から採穂したさし穂より発根率はすぐれていた。用土別の発根率は, バーミキュライト, 鹿沼土, 海砂および林床土の順位を示した。更に薬剤処理区は対照区より発根, 生長ともにすぐれていた。特にルートン処理は好結果を示した。その他, 新梢長, 葉数, 根長についても測定した。This study was carried out as the preliminary test in the cuttings of the Mulberry (Morus australis Poir.) cultivar, Tai-Song No. 2 and No. 3 for the purpose of promoting vegetative propagation by cuttings. These experiments made on the cuttings of both green branches and woody branches sprouting in 1981. On the preparation of the cuttings, the leafless woody branches were cut in the lengths of 5cm., 10cm. and 15cm., respectively. Both the leafy woody branches and green branches were cut in the length of a node having a piece of the leaf. Their cuttings were planted in the mist boxes established in glass house on September 4th. 1981 and were investigated on November 4th. 1981. The experiments were tried a comparison among these characters of the cuttings, used soils (Kanumado, Vermiculite, Sea sand and Sandy clay loam.) and treatments of chemicals. The obtained results were briefly summerrized as follows; 1. Tai-Song No. 3 gave better effect than Tai-Song No. 2 to the rooting percentage of the cuttings. 2. The rooting percentage of the cuttings obtained from the leafless woody branches gave better effect than the cuttings obtained from the other part. Theremore, 15cm. in length of the cuttings obtained from the leafless woody branches gave better effect than 5cm. and 10cm. in lengths of the cuttings. 3. On the rooting percentage of each used soils, Vermiculite gave better effect than the Kanumado, Sea sand and Sandy clay loam. 4. The rooting and growth of the cuttings for treatments with chemicals shown better effect than the control. Then, the rooting percentage of the cuttings for treatment with Rootone powder gave better effect than the other one. 5. On the other hand, the rooted cuttings were measured the height of shoots, number of leaves and the maximum length of roots