The objective of this work was to investigate the effect of increasing closes of Irati lime on the contents of Cu, Fe, Mn and Zn both in soil and the corn plant. Irati lime is a by product obtained by Petrobras Six during the oil shale mining process, presenting high levels of micronutrients. The experiment was conducted in a greenhouse using pots filled with soil from a "Cambisol Tb" A horizon, of a sandy texture. The treatments were arranged in a 2 x 5 factorial scheme, with two consisting of liming materials: a traditional commercial lime and Irati lime. The doses were calculated in CaCO3 equivalents of 0.00; 0.75; 3.00 and 6.00 t ha-1. The results showed that the soil corrected with Irati lime presented levels of Fe and Mu-extracted by means of DTPA-TEA - of 10 and 9%, respectively, higher than that treated with commercial lime. However, there was no influence on concentration in the plant. Increasing lime doses caused the decrease of Mn and Fe available in soil without causing any effect on Cu content, regardless of the type of material used. Increased lime doses caused an increase in Fe and Cu concentration and a decrease in Mn. There was no significant influence of the materials used and of their increasing doses on Zn content in soil. However, the highest Irati lime dose (6 t ha-1) promoted a significantly higher Zn content in the plants, a fact not observed in those treated with commercial lime using the same dose. Increased commercial lime this nutrient concentration in the plant while increased Irati lime doses maintained it constant.
Corn; Zea mays; lime; Cu; Fe; Mn; Zn