Adição de maravalha a substratos comerciais na produção de mudas de Eucalyptus grandis Hill ex Maiden Adding wood shavings to commercial substrates in the production of seedlings of Eucalyptus grandis Hill ex Maiden

Baseado na importância do substrato na producao de mudas e na utilizacao de materiais renovaveis para sua formulacao objetivou-se nesse estudo avaliar a viabilidade tecnica da adicao de maravalha ao substrato comercial para a producao de mudas de Eucalyptus grandis . Para tanto, testou-se cinco substratos formulados a partir de tres componentes: substrato comercial a base de casca de pinus, substrato comercial a base de turfa e a maravalha. Com base nos resultados obtidos, verificou- se que, de maneira geral, o substrato composto por 34% casca de casca de pinus + 34% turfa + 32% maravalha proporcionou maior crescimento das mudas. No entanto, todos os substratos analisados foram adequados para a producao de mudas de Eucalyptus grandis . As mensuracoes de altura e diâmetro anteriores a avaliacao final nao sao correlacionaveis para predicao do resultado final. Abstract Based on the importance of substrate on seedling production and use of renewable materials for their formulation, in this study aimed to evaluate the technical feasibility of adding wood shavings to the commercial substrate for seedlings of  Eucalyptus grandis . To this end, were tested five substrates formulated from three components the base substrate commercial pine bark, substrate-based commercial peat and wood shavings. Based on these results, it was found that in general the substrate composed of 34 % pine bark + 34% peat + 32% wood shavings provided the greatest growth of seedlings. However, all substrates examined were suitable for the production of seedlings of Eucalyptus grandis . The measurements of height and diameter prior to final evaluation are not correlated to predict the outcome.