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The spatial variability of soil attributes has received attention more than the temporal variability, but the latter is very useful and important for the management of water and soil. This study aimed to analyze the temporal stability of water storage in the soil to determine the area of parts may constitute the humidity mean value of the studied area. The study was conducted in an area with Quartzarenic Neosol, cultivated with vine and irrigated by micro, in the city of Petrolina, PE. The monitoring of the water in the soil was accomplished by probes 11 and 11 TDR probes neutron access tubes, distributed side by side in different points of the area. The techniques suggested by Vachaud et al were used. (1985) and Kachanoski and De Jong (1988) to evaluate the temporal stability of the water storage in soil, over time. The results showed that the TDR and neutron probes estimated storage values very similar to the soil profile analyzed during the study period. The storage values in the studied dates showed excellent stability over time, to the 11 sampled points. Through the analysis of average relative differences were identified among the monitored points, for each device (TDR and neutron probe), which is the best point of the storage medium, according to their greater temporal stability. For TDR, point 3 was the most indicated as representative of the average of the area; already for neutron probe was the point 1 that best represented the average. Therefore, these points would be the best representatives for carrying out a moisture sampling the soil with their equipment; Furthermore, could be used to monitor the soil water to the irrigation purposes.

ESTABILIDADE TEMPORAL DO ARMAZENAMENTO DE ÁGUA, DETERMINADO POR TDR E SONDA DE NÊUTRONS, EM UM NEOSSOLO QUARTIZARÊNICO IRRIGADO EM PETROLINA, PE