It was studied the soil-water matrix potential of a dark reddish Lasosol and a dark reddish Podzolic soil, respectively placed at the upper and at the middle slope of Campus do arenito topsequence in Cidade Gaúcha town - Northwest of Paraná State. This determination was made througt tensiometers of mercury manometer, through daily readings at 7:30, 13:00 and 18:00 o'clock, summer of 1999, at 10, 20, 30, 50, 70, 90, 120 and 150cm of depth.

After a period of 10 days of drought, a drizzle of 5 mm/h didn't increase the soil-water matrix potential, happening at 10 mm/h only, for both soils, in the latosol up to 20cm and in the podzolic soil up to 120 and 150cm of depth. When it rained 30 mm/h the matrix potential increased up to 70cm in the latosol, being linear at 90 and 120cm, increasing to 150cm again, and in the podzolic soil it remained relatively linear, indicating good field capacity.

The contrast between those two soils can be explained the texture, structures and total porosity difference of Bw and Bt horizons; through the topographical position in the slope; through their exhibition to climatic agents, which are intense in the latosol, without good vegetable covering and being mild in the podzolic soil which is covered with sugar-cane.

Such behavior was considered important for the evaluation of the hydric circulation, over all lateral and larger in PE and downslope, in fact, that could contribute to the largest erosive susceptibility of slopes with such distribution of soils.