An experiment was carried out under greenhouse conditions to evaluate the effects of arbuscular mycorrhizal fungi (AMF) and, or rhizobium inoculation, with the addition of industrial waste from lactic acid production (Ferkal), on the growth of Mimosa caesalpiniaefolia. Plastic pots of 6 L of capacity were used, filled with degraded soil from clay extraction areas with four levels of the Ferkal residue (0, 50, 100 and 200 g dm-3). Six microbiological treatments were conducted: indigenous AMF; AMF Glomus clarum; rhizobium; indigenous AMF + Rhizobium; AMF G. clarum + Rhizobium; and, non-inoculated control. The results were evaluated 103 days after planting by measuring AMF colonization; dry matter of nodules in the roots; weight of dry matter and N and P contents in the shoots. The results showed that the addition of Ferkal in the control treatment led to a significant increase in dry matter production and P content. However, the best results were observed in plants inoculated with AMF and, or Rhizobium, showing significant increases in dry weight and N and P content in the shoot, in almost all the inoculated treatments. The indigenous AMFs were more efficient than the G. clarum in promoting plant growth.
mycorrhizas; degraded areas; phosphorus; nitrogen