The objective of this study was to evaluate the effect of irrigation levels in the moisture profile in the root zone concentration of yellow passion fruit (Passiflora edulis Sims f. flavicarpa Deg). The experiment was carried out in the Experimental Area at ESALQ/USP, Piracicaba, S?o Paulo State, Brazil (22o42'30"S e 47o38'00"W). The irrigation levels were: L1 = 0.25 L; L2 = 0.50 L; L3 = 0.75 L; L4 = 1.00 L, which, L is the average water depth measure in lysimeter. The irrigation levels influenced the temporal distribution profile of matrix potential, showed different behavior in the oscillation and maintenance of water content in root zone. The water volume applied between 1,528 L plant-1 year-1 (L2) and 2,117 L plant-1 year-1 (L3) conduced adequate moisture levels in the passion fruit root zone, while L1 and L4 presented medium values above and below of the field capacity, respectively. Matrix potential values below -0.01445 MPa and above -0.00357 MPa affect negativity the yield parameters.
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