Heavy metals in soil amended with industrial waste for lettuce cultivation

摘要

A residue from galvanizing processes of the siderurgy industry was applied as a potential alternative source of micronutrients for lettuce. Essential and no essential heavy metals for plant growth were studied in an experiment set as a 5×3 completely randomized design (5 treatments×3 replications) with lettuce (Lactuca sativa L.) plants grown in a Brazilian Latossol (Oxyssol) amended with a industrial residue. The treatments consisted of residue (R) doses (0, 200, 400, 600, 800 kg/ha) combined with recommended fertilizers (RF) doses for lettuce: Treat. 1: zero kg/ha R+100% RF;2:200 R+75% RF;3:400 R+50% RF;4: 600 R+25% RF;5:800 R+0 % RF. There was no evidence of treat from the residue to the environment or trans ference of heavy metals to the food chain. Although Hg and Cd seemed to be high in the residue, plant growth and metal concentrations in soils indicate the residue as a possible input for microntrient supply to plants.