In this paper are shown the studies of root systems of rice and beans, at the Campo de Pesquisas of the Departamento de Águas e Energia Elétrica, Pindamonhangaba, grown in soils of the series Coruputuba 1 and Quati 1 and irrigated by elevation of the water level. The rice showed 70% of its roots in the first layer up to 5 cm and about 93% in the soil layer up to 10 cm, and the remaining at 75 cm of depth. Ninety-nine per cent of the roots are contained in the soil down to 25 cm. The beans presented 62% of their roots at the first 10 cm of depth and the remaining reached up to 70 cm of depth.