Composed of organic household solid waste in the production of lettuce, in pots of polyethylene terephthalate (PET)

Abstract

It was aimed study was to evaluate doses of organic compost of domestic solid waste in the lettuce production in pots made of polyethylene terephthalate (PET). The experimental design was a randomized complete block, with eight treatments and three replications. The treatments were: five doses of the organic compost: 4, 8, 12, 16 and 20 L m-3 of soil, mineral fertilization and a control. Fresh mass of roots (MF), fresh mass of roots (MFt), shoot dry mass (MSPA), dry mass of roots (MSR) and leaf length (CF) were evaluated at 60 days after transplanting the seedlings to the pots. The results were submitted to analysis of variance. When the F-test was significant, the means of the treatments were compared by Tukey's test, and linear regression was applied to the compost doses, at 0.05 of significance. It was concluded that the doses of 4, 8, 12 and 16 L m-3 of the compost showed performance equal to that of the mineral fertilization, for some parameters, and exceeded it in relation to others, being able to substitute in lettuce cultivation. The production of MFPA, MSPA, MSPA, MFT and leaf length of lettuce plants increased linearly with the organic compost doses. The dose of 20 L m-3 of the compost provided the highest poroduction of MF e MS by lettuce plants, compared to the mineral fertilization.

Keywords

• : Lactuca sativa L., recycling, composting, humic substances