Abstract
The effect of six commercial citrus rootstocks on the growth and yield of Valencia orange, Marsh seedless grapefruit, and Ortanique trees was studied in a rootstock experiment initiated in Jamaica in 1965. Results of these investigations revealed that under the soil and environmental conditions of this experiment, rough lemon and Rangpur lime rootstocks were the most vigorous of the six stocks studied; Cleopatra mandarin was the next most vigorous, while the trifoliate orange was decidedly the least vigorous of the stocks. The widely used sour orange stock was a relatively slow growing stock, and its vigour was about equal to the Troyer citrange rootstock. Yield data taken over the 3-year period 1969 to 1972 showed that the sour orange rootstock produced yields of Valencia orange, Marsh seedless grapefruit, and Ortaniques as good as the more vigorous rough lemon and Rangpur lime rootstocks, and better than the other three stocks, viz., Cleopatra mandarin, Troyer citrange, and trifoliate orange.