Chemical or Air Pruning Influences Containerized Roots of Carambola, Longan, and Mango Seedlings

in HortScience

Carambola, longan, and mango seedlings were planted in containers coated with paint containing up to 200 ppm CuCO3, and carambola and mango seedlings were planted in containers designed to provide air pruning of roots. Some plants were bare-rooted following a period of growth, and the roots were dried to a constant weight. The remainder of the plants were removed from the containers and planted in silica sand with container medium intact. The new root growth was determined after 3 to 6 months by carefully washing away the sand then removing the exposed roots. Chemical treatment of containers increased total root growth during container production and new root growth after removal from the container for longans. In contrast, chemical treatment did not influence roots of mango or carambola. Air pruning, however, increased the percentage of roots in the upper half of the container and the new root growth following removal from the container for both of these species. No circling roots were visible growing along the sides or bottom of chemically treated containers for longan and air pruning containers for mango and carambola.

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