ZINC, IRON, MANGANESE AND CADMIUM RELEASE D FROM 4 LIMING MATERIALS AND THEIR ABSORPTION BY LETTUCE IN 2 SOILS

A greenhouse experiment was carried out to evaluate zinc, iron, mangan ese and cadmium release from four liming materials applied to two dist inct soil textures and their absorption by lettuce. The treatments wer e based on factorial experiment 2 [2 (4+1)+ 1]: two soils, two lime re quirements, four liming materials + CaCo3 and an additional treatment (control). They were arranged in the randomized blocks design with thr ee replications. On the other hand, the soil pH decreased to original values after harvesting the lettuce, but the exchangeable aluminum was higher than that found in the control treatment. Absorption and accum ulation of Zn, Fe, Mn and Cd in the lettuce shoots with lime materials increments was determined in both soils. The availability of Zn, Fe a nd Mn was higher in the sandy loam soil, but for Cd it was not observe d.