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ADDITIONAL INDEX WORDS. Alstonia scholaris, container production, root circling, root length, root : shoot ratio, shoot growth SUMMARY. The effect of copper hydroxide (Cu(OH)2) applied to interior contain- er surfaces on shoot and root responses was evaluated on palimara alstonia (Al- stonia scholaris). The seedlings grown in Cu(OH)2-treated containers had greater plant height than those in untreated containers, and had no observable copper toxicity symptoms. Cu(OH)2-treated containers effectively reduced root circling on the surface of rootballs compared with untreated containers. The Cu(OH)2 treatment signifi cantly increased the dry weight of firoots (those with a diam- eter 0-2 mm) and small roots (>2-5 mm) but did not infl uence the dry weight of medium roots (>5-10 mm), large roots (>10 mm), or total roots. The Cu(OH)2 treatment also signifi cantly increased total root length and surface, which was due principally to the increasing length and surface of the fi ne roots. The results indicated that the Cu(OH)2 treatment, which can improve the root quality of palimara alstonia seedlings and thereby increase the root-length-to-leaf-area ratio and the root-surface-to-leaf-area ratio, has the potential to produce high-quality plants.

Copper Hydroxide Improved Root Quality of Palimara Alstonia in Plastic Containers