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Foram avaliados, em casa de vegetacao, os indices de consumo e a eficiencia do uso da agua em mudas de Eucalyptus citriodora e E. grandis, cultivadas em solo com tres teores de agua, associadas ou nao com Brachiaria brizantha. Utilizou-se o delineamento em blocos ao acaso, com quatro repeticoes, em arranjo fatorial (2x3x4+3x3): duas especies (E. citriodora e E. grandis), tres teores de agua (20, 23 e 26%) e quatro diferentes quantidades de plantas de B. brizantha (0, 1, 2 e 3 plantas/vaso), mais tres diferentes quantidades de B. brizantha (1, 2 e 3 plantas), associadas aos tres teores de agua. Maior crescimento do E. citriodora, E. grandis e B. brizantha foi observado em solo com o maior teor de umidade (26%). A convivencia de B. brizantha com E. citriodora ou E. grandis, em um mesmo vaso, reduziu o acumulo de biomassa seca do eucalipto, independente do teor de agua no solo. Maiores teores de agua no solo proporcionaram maior ICA, que esta diretamente relacionado a maior acumulo de biomassa seca pelos eucaliptos e B. brizantha. A eficiencia do uso de agua do eucalipto foi alta (282 g de agua/g de biomassa seca produzida), semelhante ao observado por B. brizantha (265), ambas especies estao dentro da faixa de plantas eficientes ao uso da agua, independente do teor de agua no solo. CONSUMPTION AND WATER EFFICIENCY USE INDEX BY Eucalyptus citriodora AND E. grandis PLANTS CULTIVATED IN POTS CONTAINING SOIL WITH THREE WATER CONTENTS IN THE SOIL JOINTLY WITH DIFFERENT Brachiaria brizantha POPULATIONS Abstract The objective of this study was to evaluate water efficient use of, E. citriodora and E. grandis amount of cultivated in subtract with three water contents, jointly with four amount of Brachiaria brizantha plant. Treatments were arranged in factorial design, with four replications, in a randomised blocks (2x3x4+3+3): two species of eucalyptus (E. citriodora and E. grandis), three water contents (20, 23 and 26%) and four B. brizantha populations (0, 1, 2 and 3 plants/pot) and three plus B. brizantha (1, 2 and 3 plants/pot) associated to three contents of water contents in the soil. The highest growing of E. citriodora, E. grandis and B. brizantha was observed in a soil with the highest moisture content (26%). B. brizantha association with E. citriodora or E. grandis, in the same pot, reduced the eucalyptus dry biomass accumulation regardless of water content in the soil. Higher water contents in the soil allowed higher Water Consumption Index, which is directly related to the higher accumulation of dry biomass by eucalyptus and B. brizantha Eucalyptus water use efficiency (transpiratory coefficient) was high (282 g water/g of produced dry matter), similar to observed for B. brizantha (265). They are in the range of efficient plants in water use, regardless of water content in the soil.

ÍNDICE DE CONSUMO E EFICIÊNCIA DO USO DA ÁGUA EM EUCALIPTO, SUBMETIDO A DIFERENTES TEORES DE ÁGUA EM CONVIVÊNCIA COM BRAQUIÁRIA