ANSWER INOCULATION OF MYCORRHIZAL FUNGI AND RHIZOBIUM ON THE INITIAL GROWTH OF Acacia mangium IN SOIL OF MINING IN THE STATE OF GOIÁS

Abstract

This study was done to evaluate the growth of Acacia mangium in soil from a mining area of the southwestern Goiás. The seeds were allowed to germinate for five days in a germination chamber at 26 °C. The seedlings were inoculated with arbuscular mycorrhizal fungi (AMF) isolated from maize rhizoshere and/or with rhizobia. The non-inoculated seedlings served as control. The seedlings were planted in soil collected from a mining area, and allowed to grow for 120 days in a greenhouse. The dry weight of stems and leaves of plants inoculated with AMF and/or rhizobia was higher, compared to the control plants, with maximum increase occurring in plants treated with rhizobia (155.8 %). The maximum root dry weight was found in plants inoculated with mycorrhiza/rhizobia, which had dense lateral root formation; however root length was similar to the control plants. The mycorrhizal colonization influenced nodule formation by the native rhizobia, with no significant difference between the treatments with AMF and rhizobia. The inoculation with AMF and rhizobia can be a viable alternative to develop programs to recuperate mined areas.