This work had the goal of evaluating (a) The use of legumes and grasses employed in green fertilizing; (b)The incorporation of organic matter through the addition of organic compounds and (c) The effects of chemical fertilizing and lime application in the recovery of areas degraded by tin mining in the Jamari National Forest (RO). The experiment was set up in December, 1999. The experimental design adopted consisted of casualized blocks with 24 treatments according to a 6x4 factorial scheme, composed by six types of plantcoverage (Brachiaria humidicula, Cajanus cajan, Mucuna aterrima, Cajanus cajan + Brachiaria humidicula, Mucuna aterrima + Brachiaria humidicula, and bare soil), and four types of fertilizer in the pit (NPK 10-10-10; 50% tailing + 50% compound; 50% tailing + 50% compound + NPK 10-10-10; 50% tailing + 50% compound + NPK 10-10-10 + dolomite lime. The soil samples were collected superficially (0-20 cm) and used for chemical and physical analyses in 144 installments, 15 months after planting, right after the rains fall periods. The results were submitted to analysis of variance (p < 0,05) when test F proved significant, the Tukey test was applied for comparison of the averages of six repetitions. The chemical characteristics were the only ones to present significant differences between treatments. The chemical and organic fertilizing, as well as the lime application, contributed for these differences, and the treatments that received lime presented a series of improvements in soil, such as an increase in pH, in the levels of Ca, Mg, in CTC, SB and V% and a decrease in H+Al when compared to the others. However, when the level of organic matter was analyzed, the physical parameters and the biological aspects studied did not present differences between treatments, even in those where fertilizing was intensively associated to the planting of green manure and the introduction of forest species, indicating that the improvements in the physical attributes of the soil in tailing areas must happen at a slower pace.
degraded soil; fertility; legumes
