Uso de microorganismos promotores de crescimento como tecnologia para incrementar a produção de madeira e sequestro de carbono de Schizolobium amazonicum Huber ex Ducke (Paricá) em condições de campo

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

22/04/2010

RESUMO

Schizolobium amazonicum Heber ex Ducke occurs naturally in Amazon and presents huge commercial importance due to its rapid growth and excellent performance on cropping systems – a fact that has been raising much interest in the study of new strategies to increase more efficiently the wood yield. The use of soil microorganisms and its growth-promoting potential is an important tool that may be used in intensive cropping systems of paricá. This work assessed the efficiency of both native species of arbuscular mycorrhizal fungi (AM) – Glomus etunicatum and Acaulospora sp –, two native strains of Rhizobium sp., and an exogenous strain of Burkholderia sp on the growth of S. amazonicum under field conditions, whether supplemented or not with chemical fertilizers on both methods – direct sowing and seedling plantation. The inoculation of AM and N-fixing bacteria (NFB) with addition of the two doses of fertilizers presented positive responses upon the growth of S. amazonicum. Statistically significant differences were observed for the inocula of AM, NFB, and fertilizers in the variance analyses on the 180th, 280th, and 480th days regarding the diameter, total height ,and biomass on both cropping methods. Such observed differences have varied along the time for the different growth parameters assessed. The interaction between the factors assessed was not much significative; however, the ACP multivariate analysis has shown combinations among AM, NFB, and fertilizers that presented positive relation for the growth parameters such Glomus etunicatum-Rhizobium Rh1 on the check and the lowest dose of fertilizer; Acaulospora sp-Rhizobium Rh1 on both doses of fertilizers; and Rhizobium Rh1 on both doses of fertilizers in the absence of AM. The expected wood yield for the inoculum of Acaulospora sp.-Rh1 was 25 t ha-1; among 30 t ha-1 for Acaulospora sp in the dose 1 of fertilizer (D1) and without NFB for the seeds; and 22 t ha-1 for the seedlings of Acaulospora sp.-Rh1 in dose 2 of fertilizer (D2). The amount of C for the treatment previously described ranged between 9 and 12 t ha -1 on two years of age. Such results show that the inoculation of microorganisms may be a good tool to be used in the paricá cropping system, since both species of AM fungus have stimulated the growth of paricá, when interacting with the strain Rh1 and using half of the dose of fertilizer recommended.

ASSUNTO(S)

microbiologia agrícola microorganismos do solo fungos micorrízicos micorriza vesículo-arbuscular nitrogênio - fixação reflorestamento - amazônia agricultural microbiology soil microorganism vesicular-arbuscular mycorrhiza

ACESSO AO ARTIGO

Documentos Relacionados