Production of cultivars of iceberg lettuce under two cropping systems

ABSTRACT The lettuce is grown in all regions of Brazil, however, there are restrictions on its cultivation, due to its sensitivity to the adverse conditions of temperature, humidity and water availability. In this context, the aim of this study was to evaluate the production of four lettuce cultivars under two cropping systems. The experimental design was randomized blocks in a split-plot scheme. The plots consisted of two cropping systems (low polyethylene tunnel and open field), and the sub plots of four lettuce cultivars (Angelina, Rubette, Grandes Lagos 659 and Tainá) with four replications. The characteristics evaluated were: plant height, overall diameter of the plant, transverse head diameter, stem length, stem diameter, stem fresh weight, number of commercial and non-commercial leaves, commercial and non-commercial fresh weight. Analysis of variance was performed and means were compared by Tukey test. The low tunnel favors the growth and production of lettuce cultivars in relation to open field. Cultivar Rubette shows growth and production superior to the other cultivars in both cropping systems.