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Objetivou-se avaliar a eficiência nutricional de micronutrientes (Mn, B, Cu, Zn e Fe) e Na nos diferentes componentes das árvores de três procedências de acácia-negra (Acacia mearnsii), com 2,4 anos de idade, plantadas em Butiá-RS (Brasil). As procedências selecionadas foram Lake George, Bodalla e Batemans Bay. Constatou-se grande variação na eficiência nutricional entre as procedências. A Lake George, além de acumular maior biomassa total, foi também a mais eficiente na utilização dos nutrientes na produção de biomassa total das árvores. No entanto, a Bodalla mostrou ser a procedência mais eficiente no uso dos nutrientes para produção de biomassa da casca e da madeira. The present aimed to determine the nutritional efficiency of the micronutrient (Mn, B, Cu, Zn e Fe) and Na, in the different tree components of three provenances of black wattle (Acacia mearnsii), 2.4 years old, planted in the municipality of Butiá-RS (Brazil). The selected Australian provenances were Lake George, Bodalla and Batemans Bay. A large variation was found in the nutritional efficiency among the provenances. Lake George provenance accumulated the greatest total biomass and was the most efficient in utilizing nutrient to produce total tree biomass. However, the Bodalla provenance was more efficient in the use of nutrient to produce biomass of wood and bark

Eficiência do uso de micronutrientes e sódio em três procedências de acácia-negra (Acacia mearnsii De Wild.)