The lettuce production was evaluated in soil treated with sewage sludge as source of organic matter. The experiment was carried out in the greenhouse of the Universidade Federal do Espirito Santo, Espirito Santo State, Brazil, in a complete randomized design with five replications. Plants were grown in plastic pots with 6 dm³ of soil mixture using sewage sludge in increasing doses of 0; 33.3; 66.6; 99.9 and 133.2 g dm-3. The development of lettuce plants in soil treated with sewage sludge differed significantly from the control and the regression suggests the possibility of use of larger doses of sewage sludge in the lettuce production.
Lactuca sativa L.; biosolid; residues; weighed metals
