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1 RESUMO O metodo direto mais comum utilizado na estimativa da evapotranspiracao de uma cultura e o metodo lisimetrico. Assim, o objetivo deste trabalho foi construir, instalar e analisar o desempenho de tres lisimetros de pesagem para estudo da demanda hidrica da cultura da videira Syrah ( Vitis vinifera L. ) . Os lisimetros, com dimensoes 1,2m x 2,0m de base e 1,0m de altura, foram instalados no Campo Experimental de Bebedouro da Embrapa Semiarido, em Petrolina-PE (09° 09’ latitude sul, 40° 29’ longitude oeste), e foram construidos com chapas de aco galvanizado e instalados sobre uma estrutura metalica montada sobre barras transversais, a fim de concentrar a massa do conjunto sobre uma celula de carga localizada no centro do sistema. Apos a escavacao de trincheiras no solo e colocacao dos lisimetros, procedeu-se ao preenchimento com uma camada de brita, manta poliester e nove camadas de solo de 0,1m, mantendo a disposicao original das mesmas no perfil. Foram utilizados sacos com brita com massa conhecida, para estabelecer a relacao entre a saida de sinal das celulas de carga e a massa dos equipamentos. A equacao de calibracao apresentou um alto coeficiente de determinacao. Os lisimetros apresentaram excelente sensibilidade e resolucao, detectando variacoes de massa devido a chuva, irrigacoes e evapotranspiracao, mostrando-se adequados para o estudo da demanda hidrica da cultura. Palavras-chave: calibracao, necessidade hidrica, semiarido NASCIMENTO, E. F. do; CAMPECHE, L. F. S. M.; BASSOI, L. H.; SILVA, J. A.; LIMA, A. C. M.; PEREIRA, F. A. C. CONSTRUCTION AND CALIBRATION OF WEIGHING LYSIMETERS TO ESTIMATION OF CROP EVAPOTRANSPIRATION AND CROP COEFFICIENT OF WINE GRAPES cv. SYRAH 2 ABSTRACT The most common direct method used to estimate crop evapotranspiration is the lysimetric method. Hence, the objective  of  this  work  was  to construct, install and evaluate the performance of three weighing lysimeters to estimate the water  demand  of wine  grapes  ( Vitis  viniferal L.)  cv.  Syrah. The lysimeters, 1.2 m width, 2.0 m long, and 1.0 depth, were set up at Embrapa Tropical Semi-Arid, Petrolina - PE, Brazil (9° 9’ S, 40° 29’ W), and were constructed with galvanized steel sheets and set up on a metallic infrastructure, with the purpose to link the lysimeter weight with the load cell located in the central portion of the infrastructure. After the excavation, brick and cement walls were constructed and then lysimeters were set up. The lysimeter was initially filled with a 0.1 m depth layer of grit, a thin polyester envelope and then with nine 0.1 m soil depth layers, mantaining the previous position of these layers in the soil profile. The calibration was performed with grit bags with known weights to establish the relationship between the electrical signal from load cell and lysimeter weight. The linearship was observed, with high determination coefficient. Lysimeters presented excellent sensitivity and resolution and detected weight variations caused by rain, irrigation and evapotranspiration, being suitable to estimate crop water demand. KEYWORDS: calibration, water demand, semi-arid

CONSTRUÇÃO E CALIBRAÇÃO DE LISÍMETROS DE PESAGEM PARA DETERMINAÇÃO DA EVAPOTRANSPIRAÇÃO E COEFICIENTE DE CULTIVO EM VIDEIRA DE VINHO cv. SYRAH