01901naa a2200289 a 450000100080000000500110000800800410001902400600006010000220012024501540014226000090029652009880030565000100129365000180130365000200132165000220134165000100136365000130137365000130138665000340139965300370143365300170147070000230148770000230151070000230153377300550155621300582021-02-18       2021    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1590/2179-8087-FLORAM-2019-00802DOI1 aARAÚJO, Y. P. de  aWater and radiation use efficiencies by Erythrina velutina and Enterolobium contortisiliquum under different water conditions.h[electronic resource]  c2021  aThis study investigated the water and radiation use efficiencies by Erythrina velutina and Enterolobium contortisiliquum under four water regimes. The experiment was carried out in the municipality of Serra Talhada, PE, Brazil. The experimental design was completely randomized with a 2 x 4 factorial arrangement and three replications. The water regimes were imposed from water replenishments based on the reference evapotranspiration (25, 50, 75 and 100% ET0). Water and radiation use efficiencies were calculated to the 120 days of growth. E. velutina showed a greater accumulated dry biomass (4.89 g pl-1) than E. contortisiliquum (2.22 g pl-1). The 75% ET0 water regime can be adopted without damage to the growth of both species. E. velutina was more efficient in the conversion of water (0.42 g l-1) and radiation in dry biomass (0.028 g MJ-1), indicating high environmental resilience, which is important features to choose species more adequate for reforestation activities.  aWater  aWater balance  aWater resources  aWater utilization  aÁgua  aBiomassa  aCaatinga  aEnterolobium Contortisiliquum  aEficiência do uso da radiação  aUso de água1 aSOUZA, L. S. B. de1 aSILVA, T. G. F. da1 aMOURA, M. S. B. de  tFloresta e Ambientegv. 28, n. 1, e20190080, 2021.