Arbuscular mycorrhizal fungi and phosphate fertilization on the seedling production of parica/Fungos micorrizicos arbusculares e adubacao fosfatada na producao de mudas de parica

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 parica 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 inoculum (Rhizophagus clarus + Gigaspora margarita) and control (without AMF), four P doses: 0, 60, 120 and 180 mg [dm.sup.-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. Parica 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. Keywords: mycorrhizas; phosphorus; parica; forest species. A recuperacao de diferentes ecossistemas degradados demanda pesquisas com especies florestais nativas que possam subsidiar programas de recuperacao florestal. A producao de mudas com especies arboreas nativas em associacao com os microrganismos do solo e uma importante tecnica para a reabilitacao desses ambientes. O presente trabalho teve como objetivo avaliar os efeitos da inoculacao com fungos micorrizicos arbusculares (FMAs) e nutricao fosfatada sobre o crescimento e conteudos nutricionais de mudas de parica [Schizolobium parahyba var. amazonicum (Huber ex Ducke) Barneby]. O experimento casa de vegetacao por um periodo de 75 dias, utilizando-se o delineamento experimental inteiramente casualizado, em esquema fatorial 4 x 4, inoculacao com os FMAs: Rhizophagus clarus, Gigaspora margarita, inoculo misto (Rhizophagus clarus + Gigaspora margarita) e controle (sem FMAs); quatro doses de P: 0, 60, 120 e 180 mg [dm.sup.-3] de solo, com quatro repeticoes. Foram avaliadas as vari