Crescimento de mudas e produtividade de minijardins clonais de eucalipto tratados com rizobactérias selecionadas
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Data
2005-08-18
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Revista Árvore
Resumo
O efeito de rizobactérias promotoras do crescimento foi avaliado sobre a produção de biomassa radicular, número de miniestacas por minicepa e produtividade de minijardins clonais (número de miniestacas x porcentagem de enraizamento) de eucalipto, em viveiro. Com exceção do clone 57, em todos os demais testados foi observado incremento da biomassa radicular, com média igual a 53, 52 e 69%, respectivamente, nos clones 129, 1274 e 7074. Em geral, verificaram-se diferenças significativas em produção de miniestacas, mas não no índice de produtividade. O isolado S1 destacou-se quanto à produção de miniestacas, com incrementos que variaram de 11 a 23% para os clones 129 e 1274, respectivamente. Para o clone 7074, o incremento médio foi de 15%. Os resultados indicam claramente que rizobactérias podem ser utilizadas para maximizar a propagação vegetativa do eucalipto, por estaquia.
The effect of plant growth promoting rhizobacteria was evaluated for root biomass of cuttings, number of mini-cuttings per mini-stump and productivity of mini-clonal hedges (number of mini-cuttings x rooting percent) of eucalyptus in the nursery. Except for clone 57, all other showed increase in root biomass, with an average of 53, 52 and 69% for clones 129, 1274, and 7074 respectively. In general, significant differences were found for mini-cutting production, but not for the productivity index (number of mini-cuttings x rooting percent). Isolate S1 had a substantial effect on the production of mini-cuttings, with increases varying from 11 to 23% for clones 129 and 1274 respectively. For clone 7074, the average increase was 15%. The results clearly indicated that rhizobacteria could be employed to maximize the vegetative propagation of eucalyptus by cutting.
The effect of plant growth promoting rhizobacteria was evaluated for root biomass of cuttings, number of mini-cuttings per mini-stump and productivity of mini-clonal hedges (number of mini-cuttings x rooting percent) of eucalyptus in the nursery. Except for clone 57, all other showed increase in root biomass, with an average of 53, 52 and 69% for clones 129, 1274, and 7074 respectively. In general, significant differences were found for mini-cutting production, but not for the productivity index (number of mini-cuttings x rooting percent). Isolate S1 had a substantial effect on the production of mini-cuttings, with increases varying from 11 to 23% for clones 129 and 1274 respectively. For clone 7074, the average increase was 15%. The results clearly indicated that rhizobacteria could be employed to maximize the vegetative propagation of eucalyptus by cutting.
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Palavras-chave
Eucalipto, Rizobactérias, Propagação clonal e minijardim clonal