The behavior of 10 chironja clones, studied at the Isabela, Corozal and Adjuntas Substations, demonstrated that graftage of chironja on sour orange rootstock is incompatible as determined by the scion to rootstock ratio. This incompatibility increased with tree age and was greatest in Adjuntas, intermediate in Corozal, and least in lsabela. The Adjuntas trees had significantly thinner trunk (either rootstock or scion) diameter, and smaller canopy volume than those of Isabela and Corozal. This probably accounted for the smaller size of fruits and the lower fruit production in Adjuntas as compared to those of Isabela and Corozal. The Isabela trees had significantly greater trunk (rootstock and scion) diameter and smaller scion/rootstock ratio and canopy volume than those of Corozal. The weight and number of fruits per tree increased with age from 1970-1972, while the weight per fruit was reduced at the same time. The chironja clone 2-4 produced significantly the highest crop and the heaviest fruits; therefore, its multiplication should be encouraged.
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