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In order to establish guidelines for irrigation water management of banana cv. Pacovan (AAB group, Prata sub-group) in Petrolina County, northeastern Brazil, the root distribution and activity were measured on an irrigated plantation, in a medium texture soil, with plants spaced in a 3 x 3 m grid. Root distribution was evaluated by the soil profile method aided by digital image analysis, while root activity was indirectly determined by the changing of soil water content and by the direction of soil water flux. Data were collected since planting in January 1999 to the 3rd harvest in September 2001. Effective rooting depth increased from 0.4 m at 91 days after planting (dap), to 0.6 m at 370, 510, and 903 dap, while water absorption by roots was predominantly in the top 0,6 m. Em Petrolina - PE, a distribuição e a atividade radicular da bananeira cv. Pacovan (grupo AAB, subgrupo Prata) foram obtidas em uma área irrigada, com solo de textura média e com plantas espaçadas em 3 x 3 m. A distribuição radicular foi avaliada pelo método do perfil auxiliado pela análise de imagens digitais, enquanto a atividade radicular foi indiretamente estimada pela variação da umidade do solo e pela direção do fluxo de água no solo. O período de observação compreendeu desde o plantio, em janeiro de 1999, até a terceira colheita, em setembro de 2001. A profundidade efetiva das raízes foi de 0,4 m até os 91 dias após o plantio (dap), aumentando para 0,6 m aos 370; 510 e 903 dap. A absorção de água ocorreu predominantemente na camada superficial de 0,6 m

Guidelines for irrigation scheduling of banana crop in São Francisco Valley, Brazil. I - Root distribution and activity