Abstract
SUMMARY: The study aiming to determine the effect of different irrigation depths on yield (Y), water use (WUE) and yield response factor (Ky) of carrot (cv Brasilia) for the environmental conditions of Baixada Fluminense, Rio de Janeiro State, Brazil. The field trials were conducted on an Ultisol, in 2010 and 2011, using a randomized complete block design, with 5 treatments (irrigation depths) and 4 replications. The irrigation depths were applied by drippers with different flow rate and the irrigation management was carried out using the TDR technique for the soil water content monitoring. ETo and ETc were, respectively, 286.3 and 264.1 mm, in 2010, and 336.0 and 329.9, in 2011. The results obtained in the two crop cycles showed that root yield ranged from 30.4 to 68.9 t ha -1 , corresponding to, respectively, the treatments without irrigation and that with 100% of soil water replacement. The carrot presented WUE ranging from 15.0 to 31.0 kg m -3 and average Ky of 0.82. Kc values obtained were, on average, 0.76, 1.02 and 0.96, respectively, for initial, reproduction and maturation stage. The carrot crop was influenced by different irrigation depths applied and the higher WUE was obtained for the 63.4% of soil water reposition.
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