The influence of the soil's texture and the irrigation frequency on soil water evaporation (E) and on the dry bean crop transpiration (T) rate was evaluated by the Ritchie's model. The influence of the soil's texture was evaluated by means of soils' U and alfa parameters. The databases presented by RODRIGUES (1996) were used to test the influence of the irrigation frequency. It was observed that the E component was smaller in sandy soils than in clay soils, and that the transpiration rates behaved in an inverse way. The irrigation frequency presented a similar effect as the observed for the soil's texture, i.e., the E component was smaller when the irrigation frequency was high and the transpiration was higher. Reduction in the value of the E did not provoke an equivalent reduction in the evapotranspiration rate, because the T component increased.
Key words: Ritchie model, transpiration, evaporation.