Multiple regression and correlation techniques were used to isolate environmental factors associated with three tree growth measures. Topographic variates accounted for between 42% and 48% of the variation. Altitude, percentage distance from contributing ridge crest, landsurface unit, slope and parent material were common significant factors. Prediction from edaphic morphological factors and chemical factors of the A, B or C horizon was very poor. The equations for site index (two methods) and mean annual increment index should be useful for site productivity determination in the Umzimkulu District, Transkei.* Refers to 59 thinned plots; the remainder received no thinning.

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