Use of Ethrel to promote rooting and growth in transplanting some <i>Eucalyptus</i> seedlings

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  • エスレル利用によるユーカリ苗の移植における活着促進効果
  • エスレル リヨウ ニヨル ユーカリ ナエ ノ イショク ニ オケル カッチャク

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Some one-year-old Eucalyptus seedlings were top-dressed by 500_??_6, 000 ppm solutions of a growth regulating substance named Ethrel (2 chloroethylphosphonic acid), from May to June. Within a week, most of them showed epinasty, defoliation, hardening of tissues, and dieback, all particular phenomena induced by ethylene. However, these effects were observed only on newly developing leaves, not on the old leaves. Two weeks after the treatment, seedlings were transplanted. Prior to transplanting, some were pruned and others not pruned. Only the seedlings that had been heavily pruned showed visible promotion of rooting and growth. When seedlings were pruned heavily, high survival indexes were obviously found on Ethrel of 500_??_1, 000 ppm in E. viminalis and on 500_??_3, 000 ppm in E. dalrympleana. Moreover, with Ethrel of 1, 000 ppm combined with heavy pruning, even callus was formed at the point where the roots had been clipped. However, the above-mentioned effects were hardly noticeable in transplanted seedlings with old leaves, indicating that special attention should be paid to the age of treated leaves when applying Ethrel. The results indicate that Ethrel may be utilized in transplanting of various broad-leaves trees.

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