The present work was carried out to evaluate the effect of the slag and of magnesian and dolomitic calcareous rocks on the production of dry matter of lettuce (Lactuca sativa L.) on its nutrition alteration and on some chemical attributes of the soil. The treatments consisted of the three corrective agent: magnesian lime and dolomitic and slag in three doses: 2.36, 4.72 and 7.08 g/pot. A completely randomized design in a factorial scheme 3x3+1 (three corrective agents x three doses + control) with four replications was used. The corrective agents increased production of dry matter (lettuce), especially lime. In the treatment with slag, the production was limited by high concentration of the Mn in plants. In the aerial part of lettuce correctives increased the concentration and content of Ca, Mg, and Cu, but did not alter concentration of Mn and Zn. The application of the corrective agents promoted efficient neutralization of acidity in soil, especially utilized when magnesian lime was used. The slag does not fit for lettuce culture purposes.
Lactuca sativa; liming; magnesium fertilizers; dolomite; siderurgical residue
