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This research had as objective to quantifying the time and water surface irrigation so that the front of progress wetted soil volume reach the walls lateral and superficial soil, as well evaluating the increment of wet superficial area, about subsurface irrigation. For the study, soil columns were built in glass vats and in them installed one drip to 0.25 m of depth, with flow of 1.35 L h-1 and pressure of service of 147 kPa. The experimental design was completely randomized, the treatments was front directions of progress of wetted soil volume (two continuous and two opposed, to the dripline), in function of the time (h) and irrigation levels accumulated (mm). It was possible to verify that the time and irrigations levels were larger for the position contrary to the point of incision of drip and smaller for the continuous positions; already to reach the soil surface it was smaller comparing with the front of lateral progress, existing variation of the format of the area, of irregular the close of a sphere with the increase of the time and the irrigation levels.

DINÂMICA DO BULBO ÚMIDO EM IRRIGAÇÃO POR GOTEJAMENTO SUBSUPERFICIAL