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1 RESUMO O manejo de irrigacao consiste, basicamente, na adocao de criterios pre-estabelecidos, para a definicao do momento e da quantidade de agua que deve ser aplicada. Assim, foi desenvolvida uma planilha eletronica de facil compreensao, manuseio e interpretacao pelo produtor, que utiliza como dados de entrada os atributos fisico-hidricos do solo e leituras tensiometricas para determinar a lâmina e o tempo de irrigacao, possibilitando que o produtor saiba de maneira rapida o quanto de agua aplicar ao solo. A planilha foi testada durante um ciclo de producao de videira irrigada em Petrolina, Pernambuco. As informacoes da curva de retencao de agua no solo e leituras de tensiometro na profundidade efetiva do sistema radicular da videira foram utilizadas como base para a obtencao do potencial matrico da agua no solo, umidade do solo, agua disponivel, umidade de reposicao, lâmina e tempo de irrigacao. O uso da planilha para o manejo de irrigacao resultou em menor tempo de aplicacao de agua, quando comparado ao manejo realizado com base na evapotranspiracao da cultura. A planilha pode auxiliar o produtor a realizar ajustes na quantidade de agua a ser aplicada quando o manejo de irrigacao for baseado apenas na evapotranspiracao da cultura. Palavras-chave: tensiometro, retencao de agua no solo, lâmina de irrigacao SPREADSHEET TO HELP DECISION-MAKING IN IRRIGATION SCHEDULING 2 ABSTRACT The irrigation scheduling is basically the adoption of pre-established criteria to define the time and the amount of water to be applied through irrigation systems. Hence, the objective of this work was to develop and test a spreadsheet of easy comprehension, handling and interpretation by growers, which uses as inputs the physical-hydric soil attributes and tensiometer readings to the determination of irrigation depth and time. The spreadsheet enables the grower to make reading and to know in a fast way how much water to apply into the soil. The test of the spreadsheet was performed in an irrigated orchard of grapevines in Petrolina, State of Pernambuco, Brazil. Soil water retention curves and tensiometer readings from the effective rooting depth were used as a basis for obtaining the soil water matric potential, soil water content, water availability, soil water content to be replaced, net and gross irrigation depth and irrigation time. The analysis of the use of the irrigation scheduling spreadsheet resulted in a shorter time for irrigation in relation to the irrigation scheduling based only on the crop evapotranspiration. The spreadsheet can be helpful to growers adjust irrigation depth when irrigation scheduling is based only on crop evapotranspiration. Keywords: tensiometer, soil water retention, irrigation depth

PLANILHA ELETRÔNICA PARA AUXILIO À TOMADA DE DECISÃO EM MANEJO DE IRRIGAÇÃO