The Bud-Grafting Of Cacao in Uganda

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It has often been said of the cross-pollinated cacaos that the bulk of the yield can be contributed by a small number of trees in a plantation. Pound [I] showed that in some Trinitario plantings 48 per cent of the trees produced only 4 per cent of the crop and it is probable that cacao was abandoned in Ugandan the early 1920's mainly for the reason that too many trees were yielding less than their cost of maintenance. Tree-to-tree variation can be attributed both to soil differences [2] and to the mixture of genotypes possible among the (unselected) seedlings produced by cross pollination [3]. The expression of a genotype outstanding for high yield is more marked as the environmental conditions improve, so that, whereas a genetically outstanding tree may be hardly noticeable in a poor plantation, the growing of cacao on good soils may justify a degree of selection of material proportionate to the standard of management obtaining. Experience in Uganda with cacao since its reintroduction in 1958 suggests that our better soils are good enough to merit the serious consideration of any reliable method of improvement by selection [4].
East African Agricultural And Forestry Journal, XXX (No 1), p. 49-53