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The knowledge about the productive potential of a site is extreme important, mainly from the the decision maker of the handler. In this sense, an influence of the physical environment on this potential must be understood and considered in analyzes. The aim of this study was the construction of site index curves, starting from de age and height growth, and evaluating the contribution of soil texture to site index quality, considering the population of black wattle, located in the municipality of Cristal, Rio ENCICLOPÉDIA BIOSFERA, Centro Científico Conhecer Goiânia, v.14 n.25; p. 2017 58 Grande do Sul State. For that, population informations between 9 and 11 years old, located in Ouro Verde farm were used. The results obtained to dominant height classes to the site population rate studied were 18.75 m to site class III, 21.25 m to site class II and 23.75 m to site class I. As for the granulometry soil analysis, the sand content decrease allied to the depth increase was noted, while for the clay content an increase was verified, the textural class of the soils was characterized as clay loam for the superficial and subsurface layers. After the track analysis, it was observed that particle size fractions do not influence the quality of black wattle population site, with all the coefficients being lower than the residual variable rate.

ANÁLISE DE TRILHA PARA AVALIAÇÃO DOS EFEITOS DA GRANULOMETRIA DO SOLO SOBRE O ÍNDICE DE SÍTIO PARA Acacia mearnsii De Wild.