Construction and calibration of a bar weighing lysimeter
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Universidade Estadual de Maringá
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General ly , standard lysimeters i nclude a lever - load cell scale, which has bec o me expensive compared to new electronic equipment available for experimental purposes. Currently , lysimeters containing weighing bars with up to 4 load cells are econ omically 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 . 3 5 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 co nnected to a junction box and a datalogger by a coaxial cable. Calibration of each lysimete r was performed after field installation. The results showed a linear response (R 2 > 0. 999 9 ) of electric signal (mV) to mass increase or decrease (kg) with minimum hysteresis. The m ean absolute error of the mass estimate (0 . 0245 to 0 . 2844 equivalent - mm) and a Wil l mott index between the observed and estimated data (d = 1 . 0000 ) indicate the high precision of the new equipment. The results allow concluding that the lysi meters in this study are appropriate for estimat i ng evapotranspiration and other components of soil water balance.
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