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1 RESUMO O aproveitamento de aguas residuarias na fertirrigacao de culturas agricolas tem-se mostrado como uma boa opcao na reducao da poluicao ambiental, alem de promover melhoria nas caracteristicas do solo, todavia, o uso incorreto pode trazer efeitos deleterios tanto ao solo quanto a cultura. Objetivou-se neste trabalho avaliar a condutividade eletrica (CE) e o pH na solucao do solo em diferentes profundidades e em distintas epocas do regime pluviometrico (periodo seco e periodo chuvoso), em um Argissolo Vermelho-Amarelo, quando aplicado agua residuaria de bovinocultura de leite (ARB). O experimento foi conduzido no Sistema Integrado de Producao Agroecologica, localizado no municipio de Seropedica, no Estado do Rio de Janeiro. Na area utilizada neste trabalho e cultivada a cultura da figueira ( Ficus carica L.), variedade Roxo de Valinhos. Diferentes lâminas de ARB foram aplicadas no solo como fonte de adubacao nitrogenada (T1 - 0% de ARB e adubacao complementar com torta de mamona; T2 - 50% da dose de N recomendada fornecida pela ARB e os outros 50 % com a torta de mamona; T3 - 75% da dose de N recomendada fornecida pela ARB e os outros 25 % fornecido pela torta de mamona; T4 - 100% da dose de N recomendada fornecida pela ARB). Nas parcelas experimentais foram instalados extratores de solucao do solo a 0,20 e a 0,60 m de profundidade. Diante dos resultados verificou-se que o tratamento T1 possui maior CE na solucao do solo em relacao ao tratamento T4; nao houve diferenca estatistica entre os valores da CE na solucao do solo obtidos nas distintas profundidades analisadas; a CE na solucao do solo e maior no periodo de seca; o tratamento T4 e aquele em que se obteve o maior valor de pH; o valor de pH na solucao do solo e maior na profundidade de 0,60 m e no periodo chuvoso observa-se maior valor de pH na solucao do solo. Palavras-Chaves: Reuso, salinizacao, extrator de solucao do solo. SILVA, J. B. G.; MARTINEZ, M. A.; PIRES, C. S.; ANDRADE, I. P. de S.; SILVA, G. T. da. EVALUATION OF ELECTRICAL CONDUCTIVITY AND PH IN THE SOIL SOLUTION IN AN AREA FERTIGATED WITH WASTEWATER FROM DAIRY CATTLE 2 ABSTRACT The use of wastewaters in fertigation of crops may enable increased productivity and quality of harvested products, and promote improvement in soil characteristics, however, incorrect use can have deleterious effects on both the soil and culture.The objective of this study was to evaluate the electrical conductivity (EC) and pH in soil solution at different depths and at the rainy and drought seasons in a Red-Yellow soil, when was applied wastewater from dairy cattle (WDC). The experiment was conducted in the Agroecological Production Integrated System, located in the Seropedica County, State of Rio de Janeiro. In the experimental area there is a fig crop ( Ficus carica L .), variety Roxo de Valinhos. Different WDC doses were applied to the soil as a source of nitrogen fertilization (T1-0% of WDC and additional fertilizers with castor press cake, T2-50% of the recommended dose of N supplied by the WDC and the other 50% with the castor press cake, T3-75% of the recommended dose of N supplied by the WDC and the other 25% provided by the castor press cake, T4-100% of recommended dose of N provided by the WDC). In the experimental plots were installed soil solution extractors at 0.20 and 0.60 m depth. The results show that the treatment T1 has a higher soil solution EC than the T4; there was no statistical difference between the values of soil solution EC obtained at the different depths ; the soil solution EC is higher during the dry season; the treatment T4 had the highest pH value; the pH value in the soil solution is greater at the depth of 0.60 m; in the rainy season is observed a higher pH value in the soil solution. Keywords: Reuse, salinization, extractors soil solution.

AVALIAÇÃO DA CONDUTIVIDADE ELÉTRICA E PH DA SOLUÇÃO DO SOLO EM UMA ÁREA FERTIRRIGADA COM ÁGUA RESIDUÁRIA DE BOVINOCULTURA DE LEITE