Avaliação do uso de alface - Lactuca sativa como remediadora de solos contaminados por sulfato de zinco

Abstract

The present work consisted in a test of lettuce cultivation in soils contaminated with zinc sulphate and in soils of the surroundings of Matola Cement Factory (SFCM) with the objective of evaluating the capacity of lettuce as a potential phytoremediator of soils contaminated with zinc sulphate and to analyse the growth of lettuce in SFCM. For the purpose randomized block design was used with 5 treatments namely control, Tl, T2, T3 and SFCM (0.00mg/kg, 600mg/kg, 1200mg/kg, 1800mg/kg zinc sulfate and soil from the surroundings of Matola Cement Factory), with 4 groups of 25 pots each. 30 days after sowing the zinc sulfate was introduced in soil collected from the surroundings of the university campus of UEM. In the first and second week after introduction of zinc sulphate, plant death was recorded for treatments T2 and T3. The treatment T3 was the one that registered the highest concentration of zinc absorbed by the leaves followed by the treatment with Tl. Regarding the growth analysis of lettuce in SFCM, two groups of pots were arranged in randomized blocks with soil from the campus of UEM (control) and SFCM. High values of leaf area, plant dry weight and leaf area ratio were recorded in the SFCM treatment when compared with plants grown in UEM campus soil. The soils ulitized in this experiment showed the following compositions: 19.63mg/Kg zinc sulfate in the SFCM and 0.00mg/Kg zinc sulfate in the UEM campus soil. (TRADUÇAO NOSSA)