The present work had lhe aim to evaluate the influence of the residuum originated from mining of the piro-betuminosus shales (oil shale) in the Irati formation in São Mateus do Sul. PR, in the growth and chemical composition of black oats (Avena Strigosa Schreber), as well as the influence of irrigation with deionized water or nutritive solution. The experiment was installed in a greenhouse. with a completely randomized blocks design in factorial combination 4x2, i. e., four different substracts and two water solutions (deionized water and nutritive solution), with four replications. The substract used were A and B horizon from an Oxisol (Alic Dark Red Latossolo) with different mixture proportions of oil shale; S1) 100% soil, contral, S2) 50% soil + 50% smashed oil shale; S3) 50% soil + 50% natural oil shale: S4) 50% soil + 50% retorted oil shale. The experiment was undertaken during 47 days. After this period average plant height. weight plant drymatter from the leaves and the chemical composition of the leaves for Cd, Co and Cr were determined. The results obtained indicate that in all the treatments, the concentration Cd and Co were higher than the ones observed in gramineaes originated from regions without contamination. The concentration of Cr observed in the leaves may cause toxicity to plants. Plants irrigated with nutritive solution produced higher plant drymatter. The smashed oil shale contributed to increase plant growth and plant drymatter production.
damaged areas; heavy metals; oil shale; Avena Strigosa
