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This research aimed to evaluate the gas exchange and growth index of Brachiaria decumbens under five water supply (3.84, 4.39, 6.19, 8.62 and 10.46 mm day-1). A completely randomized with split-plot design with five irrigation depth being the parcels and ages (10, 17, 24 and 31 days), the subparcels, with four replicates. It was observed interaction between irrigation depth and ages for leaf transpiration, leaf temperature, rate of photosynthesis and leaf weight ratio. Quadratic responses with minimum values were observed to the internal CO2 concentration and specific leaf area (0.0055 m2 leaf g -1 leaf) with advance in ages. The internal concentration of CO2 revealed values of 220.09 and 176.20 ppm to 10 and 31 days, respectively, with minimum (173.68 ppm) to 27 days. It was observed quadratic response with maximum value (25.04 g m-2 leaf day-1) to the net assimilation rate with increasing ages. Decreasing linear responses were observed to the relative growth rate and leaf area ratio with increasing ages. The relative growth rate presented values of 0.097 and 0.048 g g-1 day-1, with 10 and 31 days, respectively. The growth ages provided changes on gas exchange and growth index of Brachiaria grass, however, these characteristics are little influenced by irrigation depth under the conditions of this study.

Trocas gasosas e índices de crescimento em capim-braquiária manejado sob lâminas de irrigação e idades de crescimento.