Author(s): ROCHA, O. C.; GUERRA, A. F.

Summary: ABSTRACT: Bean crop producers from the Brazilian Cerrado region have only one technology adjusted for irrigation management which consist in the measurement of soil-water tension through the use of tensiometers. Although this methodology has high potential of use, it has not been widely adopted by the producers due to problems in instrumentation maintenance. Thus, the utilization of models for crop evapotranspiration estimates have shown to be applicable to the Cerrado region. So, this paper aims to evaluate the performance of Penman-FAO model to estimate evapotranspiration of black bean crop in the dry season of the brazilian Cerrado region. It also aims to provide an adjusted model to estimate evapotranspiration which permit an efficient management for the agricultural irrigated system of the Cerrado region. The black bean evapotranspiration was measured by using a weighing lysimeter. The experiment was carried in the experimental area of the Brazilian Agricultural Research Corporation (Embrapa Cerrados), located in Planaltina, DF, Brazil. When calculated with crop coefficient determined in this research and tested with adjusted wind function constant (C=2.0), Penman-FAO model presented an excellent performance and may be used in irrigation management of black bean crop.

Publication year: 2005

Types of publication: Booklets

Unit: Embrapa Cerrados

Keywords: Cerrado, Feijão, Irrigação, Manejo de Água, Phaseolus Vulgaris, beans, irrigation, water management