857 PB 434 ROOT DISTRIBUTION OF SIX PALM SPECIES GROWN IN CUPRIC HYDROXIDE-TREATED CONTAINERS

in HortScience

The root distribution of seedlings of Acoelorrhaphe wrightii, Carpentaria acuminata, Chrysalidocarpus lutescens, Livistona chinensis, Phoenix roebellenii, and Washingtonia robusta were grown in nontreated containers or in containers treated on their interior surfaces with 25, 50 or 100 g CU(OH)2/1. Seedlings of all species grown in treated containers had reduced circling or matted roots at the container wall-growing medium interface. The distribution of root dry weight and root length was species specific, and was significantly influenced by the rate of copper hydroxide applied. Copper treatment did not induce visual signs of copper toxicity, nor differences in shoot growth, nor differences in the number of higher-order lateral roots.

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