BEHAVIOR OF 10 CULTIVARS OF LETTUCE FERTI LIZED WITH URBAN WASTE COMPOST

This work was conducted in greenhouse at the Universidade Federal de V icosa, Brazil, in 1993, aiming to verify the behaviour of ten lettuce cultivars (Lactuca sativa L.), when fertilized with urban waste. The s ubstrate consisted of waste compost (on a dose equivalent to 35 t/ha) and a Red-Yellow Latosol, clayey texture. The treatments were ten cult ivars. The statistic model applied was in randomized block with four r eplications. Lettuce cultivars fertilized with urban waste compost dif fered among themselves in relation to the weight of leaf dry-and-fresh matter, root dry matter and concentration of Zn, Mn, K and Na in leaf dry matter. There was no difference among the cultivars in relation t o the concentration of Pb and Cu in leaf dry matter. In all cultivars, the Pb concentration exceeded 0.50 mu g/g of fresh matter, which is t he tolerance limit for this metal in fresh leaves.