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In semi-arid regions irrigation management is essential in order to have high efficiency of water use. In order to evaluate the spatial variability of soil moisture (%), before and after irrigation, a study was developed in alluvial irrigated plot by sprinkler, at the Experimental Basin Ipanema river, in the municipality of Pesqueira-PE, semiarid region of the state. The experiment was conducted in an area with grid of 96 x 32 meters corresponding to a regular grid of 8 x 4 meters, totaling 104 points The type of soil in the area is the Fluvic Neosol. Soil moisture was measured using a TDR equipment, the layer 0.00 to 0.20 m. We also performed the evaluation of irrigation system, grid of 4 x 4 meters. The soil moisture values were submitted to classical statistical analysis, geostatistics y was determined and its uniformity of distribution in the area. After evaluation of the irrigation system was observed that for Fluvisol studied CUD and CUC 72.30% and 75.42% of water application, They led CUD of 74.40% and 77.12% for CUC soil moisture. The semivariogram model that showed the best fit was the exponential for the two measurement moments of soil moisture, validated by the cross-validation technique. The spatial dependence structure was used in the mapping of soil moisture, carried out through technical kriging and we observed the distribution of soil moisture.The sprinkler irrigation system was adequate in terms of uniformity of water stock in the soil layer studied.

VARIABILIDADE ESPACIAL DA UMIDADE DO SOLO EM PLANTIO IRRIGADO NO SEMIÁRIDO PERNAMBUCANO