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Estudos envolvendo lisimetros de pesagem adaptados para plantas de pequeno porte nao sao comuns, normalmente, a investigacao da evapotranspiracao e transpiracao de culturas se da por meio da utilizacao de recipientes de grande porte apoiados em sistemas de balanceamento, o que demanda um grande trabalho mecânico para construcao dos mesmos. Sendo assim, este trabalho teve como objetivo investigar a eficiencia de lisimetros de pesagem de pequeno porte, que foram construidos para o estudo da transpiracao de plantas de feijao (Phaseolus vulgaris L.)  na estacao de seca, em Cuiaba-MT. Com a utilizacao de vasos e garrafas pet, foi possivel construir 198 lisimetros de pesagem de pequeno porte e dividi-los em 15 grupos com diferentes quantidades de agua no solo. Dados horarios de temperatura e umidade relativa do ar, adquiridos do Instituto Nacional de Meteorologia (INMET), foram utilizados no calculo do deficit de pressao de vapor (DPV) para a caracterizacao da condicao meteorologica local durante o dia de medicoes. Foi possivel realizar o balanco hidrico nos lisimetros com a utilizacao de balanca digital. Obteve-se um ajuste exponencial da transpiracao em funcao da quantidade de agua no solo (R²= 77,8%) e observou-se uma forte relacao da transpiracao com o deficit de pressao de vapor.Palavras-chave: lisimetros adaptados; taxa de transpiracao; deficit de pressao de vapor. SMALL WEIGHING LYSIMETERS IN THE INVESTIGATION OF TRANSPIRATION OF BEAN PLANTS ABSTRACT: Studies involving weighing lysimeters adapted for plants of small sizes are not common, usually the investigation of evapotranspiration and transpiration of cultures occurs through the use of large containers supported in balancing systems, which demands a great mechanical work for construction. Thus, this study aimed to investigate the efficiency of small-scale weighing lysimeters constructed for the study of the transpiration of bean plants (Phaseolus vulgaris L.) in the dry season in Cuiaba (Mato Grosso). Using plastic vases and pet bottles, it was possible to construct 198 small weighing lysimeters and divide them into 15 groups with different amounts of water in the soil. Hourly air temperature and relative humidity data, acquired from the National Institute of Meteorology (INMET), were used in the calculation of the vapor pressure deficit (VPD) for the characterization of the local meteorological condition during the day of measurements. It was possible to perform the water balance in the lysimeters with the use of commercial balance (1g precision). An exponential adjustment was obtained of transpiration as a function of the amount of water in the soil (R² = 77.8%) and a strong relationship of transpiration with the vapor pressure deficit was observed.Keywords: adapted lysimeters; transpiration rate; vapor pressure deficit.

LISÍMETROS DE PESAGEM DE PEQUENO PORTE NA INVESTIGAÇÃO DE TRANSPIRAÇÃO DE PLANTAS DE FEIJÃO