Avaliação técnica e econômica da produção de duas cultivares de alface crespa em função de lâminas de irrigação.

Abstract

The present work was intended technic and economic valuation of the production of two lettuce cultivars type crisped in function of irrigation depths, cultivated under protected environment in the region of Lavras (MG). The experiment was set up in greenhouse with randomized block design in 2 x 4 factorial scheme, with four replicates. The treatments consisted of two lettuce cultivars, Verônica and Hortência, and four irrigation depths, 75, 100, 125 and 150% of water replacement. The results enabled to conclude the two cultivars of lettuce presented the same trend as regards water consumption throughout production cycle; higher yields (total and commercial) were obtained with the application of the irrigation depth of 240 mm (121.2% of water replacement); the maximum commercial yield, 33.225 Kg.ha-1, was estimated from the application of the depth of 244.9 mm (123.7% of water replacement); the economically optimum depth was estimated in 244.2 mm, resulting into a commercial yield practically equal to the physical maximum one.