Different substrates in the production of blueberry seedlings/Diferentes substratos na producao de mudas de mirtileiro

The research aimed to evaluate the effect of the composition of different substrate on the production of blueberry seedlings. The seedlings used were highbush, 'Georgiagem' from in vitro multiplication. Seven different substrate were used: T1--Plantmax(r) (100%); T2--Plantmax(r) + perlita (1:1); T3--soil + composed industrial + perlita (1:1:1); T4--soil + rice husks (1:1); T5--soil + composed industrial + vermiculite (1:1:1); T6--acacia bark + soil (1:1); T7--pine needle mulch + soil (1:2). The substrate pine needle mulch + soil, followed by the substrate Plantmax(r), acacia bark + soil and soil/rice husks + soil, which promoted greater dry mass of roots and shoots. The substrate Soil + composed industrial + perlita and soil + composed industrial + vermiculite, pH alkaline, showed lower production of dry matter and lower concentrations of Fe, Mn, Zn, N and P. Pine needle mulch + soil, soil + rice husks, acacia bark + soil and the substrate Plantmax(r) with or without perlita g were the most suitable r for the production of blueberry seedlings, cultivar 'Georgiagem'. Key words: highbush, nutrition, 'Georgiagem', in vitro, Vaccinium. O objetivo desse trabalho foi avaliar o efeito da composicao de diferentes substratos na producao de mudas de mirtileiro. Foram utilizadas mudas da cultivar 'Georgiagem', oriundas de multiplicacao in vitro. Foram utilizados sete diferentes substratos, os quais sao: T1--Plantmax(r) (100%); T2--Plantmax(r) + perlita (1:1); T3--Solo + materia organica + perlita (1:1:1); T4--solo + casca de arroz (1:1); T5--solo + composto industrial + vermiculita (1:1:1); T6--casca de acacia + solo (1:1); T7--acicula de pinus + solo--(1:2). O substrato acicula de pinus + solo, seguido pelos substratos Plantmax(r), casca de acacia + solo e casca de arroz + solo promoveram maior acumulo de massa seca da parte aerea e raizes. Os substratos solo + composto industrial + Perlita e Solo + composto industrial + vermiculita, com pH alcalino, apresentaram menor producao de massa seca e menores concentracoes de Fe, Mn, Zn, N e P. Os substratos acicula de pinus, casca de acacia + solo, casca de arroz + solo e Plantmax(r) com ou sem perlita, mostraram-se os mais adequados para a producao de mirtileiro, cultivar 'Georgiagem'. Palavras-chave: highbush, nutricao, 'Georgiagem', in vitro, Vaccinium.