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1  RESUMO A qualidade de agua residuaria constitui-se como uma das principais limitacoes para producao agricola. O objetivo deste trabalho foi monitorar a qualidade quimica e biologica das aguas dos rios Serido e Barra Nova a jusante de Caico, RN. O presente estudo foi realizado na zona periferica de Caico, sendo escolhidos quatro pontos de amostragens situados exatamente nos mesmos locais de captacao de agua para irrigacao, denominados de: agua de referencia (AR) e locais 02, 03 e 04, nos meses de julho, outubro e dezembro de 2010 e em maio e setembro de 2011, totalizando cinco repeticoes. No rio Serido coletou-se a agua de referencia a montante da cidade, livre de esgoto e, a amostra 02, proximo ao lancamento de esgoto. Os locais 03 e 04 situam-se no rio Barra Nova a jusante da cidade. Os parâmetros analisados foram CE e pH in loco e Na + , K + , Ca 2+ , Mg 2+ , Cl - , Zn + , Cu + , Fe + , Mn + , Cd + , Pb + , Cr + , Ni + , P (total), N (Kjedhal), N-NH 3 , alem de DQO, DBO e coliformes fecais e totais. As analises das aguas residuarias apresentaram classe de salinidade media, sodicidade e toxicidade de media a alta com baixa concentracao de metais pesados e com densidade de DBO e coliformes acima dos padroes recomendados pelo CONAMA. A qualidade das aguas residuarias nao apresenta impacto negativo ao ambiente se adotado tecnicas especificas para reuso agricola bem como um monitoramento da qualidade das aguas. Palavras-chaves: esgoto urbano, metais pesados, salinidade, Pennisetum purpureum, Schum. DANTAS, T. B.; FERREIRA NETO, M.; ALVES, S. M. C.; HOLANDA, J. S. de; MELO, S. B. de CHEMICAL AND BIOLOGICAL WATER QUALITY OF RIVER SERIDO AND RIVER BARRA NOVA IN URBAN PERIMETER OF CAICO CITY, RN 2  ABSTRACT Wastewater quality is the primary limitation factor in agricultural production. The objective of this study was to monitor the chemical and biological quality of water from the Serido and Barra Nova rivers downstream Caico, Rio Grande do Norte, Brazil. This experiment was conducted in the outskirts of Caico. Samples were taken from four sites where irrigation water was captured and labelled reference water (RW) plus sites #2, #3 and #4 in July, October and December 2010 as well as in May and September 2011, with five replications. RW was collected from the Serido at an upstream from town and sewage free location whereas samples for site #2 were taken close to a sewage disposal point. Sites #3 and #4 were located on the river Barra Nova downstream of town. The analyzed parameters were EC and pH in loco plus Na+, K+, Ca²+, Mg²+, Cl-, Zn+, Cu+, Fe+, Mn+, Cd+, Pb+, Cr+, Ni+, P (total), N (Kjedhal), N-NH3 as well as COD, BOD and total and fecal coliform. Wastewater analysis showed average salinity, sodicity and toxicity from medium to high with low heavy metal concentration and BOD density and coliform above the values recommended by Brazilian environmental authority’s (Conselho Nacional do Meio-Ambiente - CONAMA). Wastewater quality had no negative impact on the environment if adopted specific techniques for agriculture reuse along with monitoring of water quality. Keywords: urban sewage, heavy metals, salinity, Pennisetum purpureum, Schum. levn-P  pt;font-family:"Times New Roman","serif";background:white; mso-ansi-language:EN-US'>  Keywords: productivity, water restriction, profitability, Glycine max.

QUALIDADE QUÍMICA E BIOLÓGICA DAS ÁGUAS DOS RIOS SERIDÓ E BARRA NOVA NO PERÍMETRO URBANO DA CIDADE DE CAICÓ, RN