QUALIDADE DE ÁGUAS PARA FINS DE IRRIGAÇÃO DA REGIÃO DO CONGO, PB

Abstract

The research was carried out to evaluate the quality of waters used in the irrigation of agricultural areas of Congo region, Paraíba State, Brazil. The water samples were collected in Cordeiro dam, in wells and in river, in two periods of the year, rainy (May/2006) and dry period (December/2006) and analyzed under the qualitative aspects of salinity, sodicity and toxicity of ions. For the studied conditions and in agreement with the evaluated parameters in both periods, most of the samples of water, as for the salinity, were considered normal for the use in the irrigation since special practical of soil and water management are adopted; as the toxicity of the ion sodium, more than 40% didn't present restriction to the use. In relation to the toxicity of the ion chloride, in the rainy period, 61% of the samples didn't indicate restriction to the use for irrigation and in the dry period, 44% presented restriction varying from low to moderate.