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A estaquia de genotipos superiores de Pinus radiata e uma pratica comum na silvicultura. Para sua utilizacao no Brasil, protocolos de propagacao precisam ser estabelecidos. Este trabalho avaliou a miniestaquia aplicada a producao de mudas da especie, estudando a posicao de coleta de broto na planta matriz, a estacao do ano e o minijardim. Plantas matrizes seminais, com 1 m de altura e 1,5 anos de idade, foram utilizadas para a producao de miniestacas. Tres ensaios consecutivos foram feitos: (i) o enraizamento das miniestacas coletadas de tres posicoes nas matrizes (topo, intermediario e basal), (ii) a influencia do minijardim (vaso, canaletao e campo) no desenvolvimento de minicepas e (iii) o efeito da estacao do ano (inverno, primavera e verao) sobre o desenvolvimento de miniestacas coletadas de minicepas no canaletao, no vaso e em campo. As miniestacas coletadas da regiao intermediaria das matrizes, com 1,5 anos de idade, apresentaram maior enraizamento do que as coletadas no topo e na regiao basal. As melhores estacoes para o desenvolvimento dos brotos foram inverno e primavera, em ambientes de vaso e campo. O verao promoveu melhor desenvolvimento das miniestacas em casa de vegetacao, a partir de matrizes cultivadas em canaletao. Palavras-chave : Clonagem; conifera; producao de muda; propagacao vegetativa. Abstract Effect of matrix plant, season and minigarden on Pinus radiata minicutting. Cutting of superior genotypes of Pinus radiata is current in forestry. For such practice in Brazil, protocols of propagation need to be established. We evaluated the mini-cutting applied to seedling production, focusing the collection point in matrix plant, season, and minigarden. We used seminal matrix 1 m height and 1.5 years old for mini-cutting production. Three consecutive trials were made: (i) the rooting of mini-cuttings collected from three points in the matrix (top, intermediate and basal), (ii) the influence of minigarden (pot, gutters and field) in development of rooted, and (iii) the effect of season (winter, spring and summer) on the development of rooted cuttings collected in pot, gutters and field. The mini-cuttings collected from the intermediate region of the 1.5 years old seedlings matrices had higher rooting than those collected from the top and basal region. The best time for the development of buds was winter and spring in pots as well as field environments. Summer promoted the best development of mini-cuttings, in greenhouse, from matrix plant grown in gutters. Keywords: Cloning; conifer; seedling production, vegetative propagation.

EFEITO DA PLANTA MATRIZ, ESTAÇÃO DO ANO E AMBIENTE DE CULTIVO NA MINIESTAQUIA DE Pinus radiata