ECTOMYCORRHIZAL ISOLATES IN THE SEEDLING PRODUCTION OF Eucalyptus grandis W. Hill ex. Maiden IN QUARTZARENIC NEOSOLS

Abstract

No estado do Rio Grande do Sul, os reflorestamentos de eucalipto encontram-se, geralmente, em solos de baixa fertilidade natural, favorecendo a associa\ue7\ue3o ectomicorr\uedzica. Neste trabalho, avaliou-se o efeito da inocula\ue7\ue3o dos isolados de fungos ectomicorr\uedzicos UFSC-Pt116, UFSC-Pt188 e UFSC-SA9, sobre plantas de Eucalyptus grandis, em Neossolo Quartzar\ueanico. As avalia\ue7\uf5es foram realizadas aos 30, 45, 60, 75 e 90 dias ap\uf3s semeadura. Plantas inoculadas com os isolados UFSC-Pt116, UFSC-Pt188 e UFSC-SA9 alcan\ue7aram maior altura, di\ue2metro do caule, massa seca da parte a\ue9rea e volume de ra\uedzes em rela\ue7\ue3o ao controle. Plantas inoculadas com o isolado de fungo ectomicorr\uedzico UFSC-Pt188 apresentaram maior teor de f\uf3sforo e pot\ue1ssio na parte a\ue9rea que as plantas n\ue3o inoculadas. A inocula\ue7\ue3o com o isolado f\ufangico ectomicorr\uedzico UFSC-Pt116 promoveu maior altura e massa seca da parte a\ue9rea. Para os teores de nitrog\ueanio e pot\ue1ssio, e para massa seca de ra\uedzes n\ue3o foram observadas diferen\ue7as significativas entre os tratamentos. A inocula\ue7\ue3o com os fungos ectomicorr\uedzicos UFSC-Pt116, UFSC-SA9 e UFSC-Pt188 isoladamente, promoveram maior altura, di\ue2metro de caule, ac\ufamulo de massa seca da parte a\ue9rea e volume de ra\uedzes das plantas de Eucalyptus grandis.In Rio Grande do Sul state, the eucalyptus planted forests are cultivated in low fertility soils, which contribute to ectomycorrhizal association. This study evaluated the effect of ectomycorrhizal isolates UFSC-Pt116, UFSC-Pt188 and UFSC-SA9 inoculation, individually and in combination, with Eucalyptus grandis in Quartzarenic Neosols. Evaluations were performed at 30, 45, 60, 75 and 90 days after sowing. Plants inoculated with isolates UFSC-Pt116, UFSC-Pt188 and UFSC-SA9 showed highest height, stem diameter, dry mass of shoot and root volume than the control. Plants inoculated with the ectomycorrhizal fungus isolate UFSC-Pt188 showed highest content of phosphorus and potassium in shoots than non-inoculated plants. Inoculation individual ectomycorrhizal isolate UFSC-Pt116 promoted the highest height and shoot dry mass. For nitrogen and potassium, and root biomass have not showed significant differences between treatments. Then inoculation with ectomycorrhizal UFSC-Pt116, UFSC-Pt188 and UFSC-SA9 alone promoted highest height, stem diameter, dry mass of shoot and plant root volume of Eucalyptus grandis