The present study aimed to determine the nutritional efficiency of the macronutrients N, P, K, Ca, Mg and S, in the different components of trees from three provenances of black wattle (Acacia mearnsii De Wild.), 2.4 years old, planted in Butiá, RS, Brazil. The selected Australian provenances were Lake George, Bodalla and Batemans Bay. There was a wide variation in the nutritional efficiency among the provenances. In a decreasing ranking for efficiency of nutrient utilization for the production of wood and bark, products that are exploited in the even-aged forest, the following results were obtained: Bodalla > Batemans Bay > Lake George. Although Lake George is less efficient in using nutrients to produce wood, bark and crown, it has a great capacity of production.
Nutritional efficiency; Acacia mearnsii; macronutrients
