Mariano, Daiane de CinqueFaria, Rogerio Teixeira de [UNESP]Lourenco de Freitas, Paulo SergioLena, Bruno PatiasJohann, Andre Luiz [UNESP]2018-11-272018-11-272015-07-01Acta Scientiarum-agronomy. Maringa: Univ Estadual Maringa, Pro-reitoria Pesquisa Pos-graduacao, v. 37, n. 3, p. 271-278, 2015.1807-8621http://hdl.handle.net/11449/164894Generally, standard lysimeters include a lever-load cell scale, which has become expensive compared to new electronic equipment available for experimental purposes. Currently, lysimeters containing weighing bars with up to 4 load cells are economically feasible. This goal of this study was to present the construction and calibration of four weighing lysimeters built using two rectangular tanks, with a surface area of 1.35 m(2) (1 m by 1.35 m) and a depth of 1.5 m, loaded on two weighing bars. Each bar had two high accuracy loading cells connected to a junction box and a datalogger by a coaxial cable. Calibration of each lysimeter was performed after field installation. The results showed a linear response (R-2 > 0.9999) of electric signal (mV) to mass increase or decrease (kg) with minimum hysteresis. The mean absolute error of the mass estimate (0.0245 to 0.2844 equivalent-mm) and a Willmott index between the observed and estimated data (d = 1.0000) indicate the high precision of the new equipment. The results allow concluding that the lysimeters in this study are appropriate for estimating evapotranspiration and other components of soil water balance.271-278engevapotranspirationwater balancesoil waterArtigo10.4025/actasciagron.v37i3.19368S1807-86212015000300271WOS:000360379000001Acesso abertoS1807-86212015000300271.pdf