Crisphead lettuce cultivars were evaluated during the summer in Santana da Vargem, Brazil. The experimental design was a randomized complete blocks, with 3 replications. Total and commercial yield, stem length, head circumference, and health of the outer leaves from 17 cultivars was evaluated. Most cultivars presented similar results compared to the traditionally cultivated cv. Raider, in terms of total yield. For commercial yield, cultivars Lucy Brown, PSR 5338, PSR 4303, PSR 0110, Empire 2000 and Seeker did not present significant difference from 'Raider' (333.8 g/plant) with 266.6; 276.1; 293.8; 301.6; 304.4; and 333.8 g/plant, respectively. In relation to head circumference, with exception of cv. PSR 5338, other cultivars with better commercial yield were statistically similar, varying from 38.7 to 41.5 cm.
Lactuca sativa L.; yield; cultivar competition
