Fungos micorrízicos arbusculares e adubação fosfatada na produção de mudas de paricá

Abstract

The recovery of degraded ecosystems demands research with native species that can support forest restoration programs. The production of seedlings with native tree species in association with soil microorganisms is an important technique for the rehabilitation of these environments. This study aimed to evaluate the effects of inoculation with arbuscular mycorrhizal fungi (AMF) and phosphorus nutrition on growth and nutrient content of paricá seedlings [Schizolobium parahyba var. amazonicum (Huber ex Ducke) Barneby]. The experiment was conducted in a greenhouse for a period of 75 days, using a completely randomized design in a factorial 4x4, inoculation with AMF: Rhizophagus clarus, Gigaspora margarita, mixed inoculums (Rhizophagus clarus + Gigaspora margarita) and control (without AMF), four P doses: 0, 60, 120 and 180 mg dm-3 soil, with four replications. The variables height, dry matter area, root dry matter, leaf area, stem diameter and the contents of N, P, K, Ca and Mg in shoots, were evaluated. Paricá seedlings showed higher colonization percentage for Rhizophagus clarus and mixed inoculum (80 and 90%, respectively), different from that observed for the species Gigaspora margarita, with a lower percentage (20%). The Rhizophagus clarus and mixed inoculum, in the absence of P, increased the growth variables relative to the control plants. The contents of N, P, Ca and Mg were influenced by the AMF and by the doses of P.