Carambola (Averrhoa carambola L.), longan (Dimocarpus longan Lour.), and mango (Mangifera indica L.) nursery transplants were produced in copper-treated, air-root-pruning (only carambola and mango), or untreated conventional plastic containers during 1990 and 1991. Copper treatments did not influence root growth of carambola or mango; but increased total root growth during container production, the proportion of roots in the upper half of the root system, and new root growth after transplanting for longan. Air-root-pruning containers increased the proportion of roots in the upper half of the rootball and new root growth of carambola and mango following transplanting. Copper-treated containers for longan and air-root-pruning containers for carambola and mango effectively stopped root extension growth at the container wall-medium interface.
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Marler et al. (1996) studied this question.