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1  RESUMO O objetivo deste trabalho foi avaliar os efeitos da aplicacao de biofertilizante bovino e da salinidade da agua de irrigacao, sobre as trocas gasosas e produtividade do feijao-de-corda. A pesquisa foi realizada na Fazenda Experimental do Vale do Curu, em Pentecoste, Ceara, entre novembro de 2010 a janeiro de 2011. As plantas foram dispostas em um arranjo de parcelas subdivididas, no delineamento em blocos ao acaso, com quatro repeticoes. As parcelas consistiram de quatro diferentes concentracoes de sais na agua de irrigacao (0,5, 2,2, 3,6 e 5,0 dS m -1 ), via gotejamento, e as subparcelas consistiram de quatro niveis de biofertilizante, correspondendo a 0, 15, 30 e 45% do volume aplicado. Na conducao do experimento foram analisadas as trocas gasosas e a produtividade. A salinidade da agua de irrigacao reduziu as trocas gasosas (condutância estomatica, fotossintese e concentracao interna de CO 2 ) e a produtividade do feijao-de-corda. A aplicacao do biofertilizante via foliar interferiu positivamente nos valores de transpiracao, peso de graos e produtividade na cultura do feijao-de-corda sob estresse salino. Palavras-chave : Vigna unguiculata L., salinizacao, insumo orgânico. SILVA, F. L. B. da; LACERDA, C. F. de; NEVES, A. L. R.; SOUSA, G. G. de; SOUSA, C. H. C. de; FEERIRA, F. J. IRRIGATION WITH SALINE WATER PLUS BOVINE BIOFERTILIZER IN THE GAS EXCHANGES  AND PRODUCTIVITY OF COWPEA 2 ABSTRACT Faced with the need for higher yields and lower costs in salinized areas, organic fertilizers (like bovine biofertilizers) have been widely adopted in agriculture. In that context, the objective of this study was to evaluate the effects of bovine biofertilizer and saline irrigation water, on cowpea gas exchanges and productivity. The research was conducted at the Fazenda Experimental do Vale do Curu, Pentecoste, Ceara, Brazil, from November 2010 to January 2011. The plants were disposed in randomized blocks, in a split-plot design with four replications. The plots corresponded to four different concentrations of salts in the drip irrigation water (0.5, 2.2, 3.6 and 5.0 dS m-1), and the subplots consisted of four bovine biofertilizer ratios, representing 0, 15, 30 and 45% of the applied volume. The experiment evaluated the effects (of the controlled variables) on gas exchanges and productivity. The salinity of the irrigation water reduced cowpea gas exchanges (stomatal conductance, photosynthesis and internal CO2 concentration) and cowpea productivity. The leaf application of bovine biofertilizer had positive influence on the values of transpiration, grain weight and productivity of the cowpea culture under salt stress. KEYWORDS: Vigna unguiculata L. Salinization. Organic inputs.

IRRIGAÇÃO COM ÁGUAS SALINAS E USO DE BIOFERTILIZANTE BOVINO NAS TROCAS GASOSAS E PRODUTIVIDADE DE FEIJÃO-DE-CORDA