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Ciência Florestal

versão impressa ISSN 0103-9954versão On-line ISSN 1980-5098

Ciênc. Florest. vol.21 no.2 Santa Maria abr./jun. 2011

http://dx.doi.org/10.5902/198050983240 

Nota Técnica

SOBREVIVÊNCIA E CRESCIMENTO INICIAL DE MUDAS DE Pinus taeda L. COM DIFERENTES DIÂMETROS DO COLO

SURVIVAL AND INITIAL GROWTH OF Pinus taeda L. SEEDLINGS WITH DIFFERENT COLLAR DIAMETERS

Raúl Vicente Pezzutti1 

Silvana Lucia Caldato1 

1. Engenheiro Florestal, Doutorando do Programa de Pós-graduação em Engenharia Florestal, Centro de Ciências Rurais, Universidade Federal de Santa Maria, Av. Roraima, 1000, CEP 97105-900, Santa Maria (RS). raulpezzutti@yahoo.com.br / scaldato@yahoo.com.br.


RESUMO

Com o objetivo de avaliar a sobrevivência e o crescimento de mudas de Pinus taeda produzidas em recipientes e em raiz nua com diferentes diâmetros do colo (DC) inicial, foram estabelecidos dois experimentos em solo de drenagem deficiente localizados na província de Corrientes, Argentina. O delineamento experimental utilizado foi o de blocos completos ao acaso, com três repetições por tratamento, sendo cada unidade experimental composta por 64 plantas e bordadura perimetral dupla. Os tratamentos avaliados, no experimento 1, foram mudas de recipientes com DC de 1,6 mm; 2 mm; 3 mm e 4 mm, e no experimento 2, foram mudas de raiz nua com DC de 3 mm; 4 mm; 5 mm e 6 mm. Aos 4 anos de idade, as mudas de recipientes não apresentaram diferenças significativas em sobrevivência e crescimento; enquanto que nas mudas de raiz nua, a sobrevivência foi maior nos tratamentos de 4 e 5 mm não se encontrando diferença significativa em crescimento entre os tratamentos. Para os dois tipos de produção de mudas, o diâmetro do colo não teve influência significativa no crescimento a campo.

Palavras-chave: desenvolvimento; qualidade de muda; parâmetros morfológicos

ABSTRACT

The aim of this research was to evaluate the survival and growth of Pinus taeda seedlings produced in containers and bare root with different collar diameters. Two trials were established in a poor drained area located in the Corrientes province, Argentina. The experimental design was randomized complete blocks, with 3 replications and experimental units with 64 seedlings with double lines buffer. The treatments evaluated on the trial 1 were seedlings produced in containers with collar diameter of 1,6 mm; 2 mm; 3mm and 4 mm and on the trial 2 were bare root seedlings with collar diameters of 3 mm; 4 mm; 5 mm and 6 mm. At 4-year-old the seedlings produced in containers did not showed significant differences in survival and growth however in the bare root seedlings production, the seedlings with 4 and 5 mm showed the best survival. No significant differences in growth were detected for all the treatments. For both types of seedling production the collar diameter did not showed significant influence in field growth.

Keywords: development; seedling quality; morphological parameters

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