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Abstract
A growth equation and a yield relationship were calculated to estimate space requirements and yields of two pecan cultivars (Carya illinoensis (Wangenh.) C. Koch]. The resulting estimates were used with pruning cost estimates in a simulation model to determine the orchard space management practice that maximizes income over time. The income maximizing spacings were 10.7 × 10.7 m and 13.7 × 13.7 m for the precocious ‘Desirable’ and the non-precocious ‘Stuart’, respectively. Annual pruning after the canopy closed produced the highest income for both cultivars.