Profitability of lettuce cultivars organic production in greenhouse and field with different tillage soil

摘要

> face="Verdana, Arial, Helvetica, sans-serif" size="2">It was evaluated the economical profitability of three lettuce cultivars cultivated in greenhouse and field with different tillage soil, in Rio Branco, Acre, Brazil. The experiments were installed in January, June and November 2006. The experimental design was randomized blocks in split-plot arrangement in strips, with four replications. The strips corresponded to cultivation in greenhouse and field. In each strip, three lettuce cultivars (Simpson, Marisa and Vera), constituted the split-plot and were raffled in the plot represented by four tillage soil (conventional tillage with mulching peel rice, silvered polyethylene ,non- mulched soil and non-tillage soil). The mean total cost (MTC) in greenhouse was of R$0.50 bundle-1, 26% smaller than in field. The liquid revenue of R$24,270.67ha-1 cycle-1, was obtained in greenhouse and R$14,124.92ha-1 cyicle-1 in field. The non-tillage soil promoted smallest MTC and largest liquid revenue in greenhouse (R$30,724.64ha-1 cycle-1) and in field (R$22,892.71ha-1 ciclo-1) and the largest rentability index. Therefore, the organic no-tillage of lettuce in Acre in greenhouse preference and in field it provides better economical rentability than the other types of tillage and mulching of the soil.