Influencia da aplicação da água residuária nas características química de um planossolo nátrico na Região Semiárida Paraibana

Abstract

In arid and semi-arid areas, water scarcity is a limiting factor for agricultural production. The reuse of wastewater in agriculture can be a viable alternative, taking into account safety criteria such as quality and quantity of effluent and its effects on the chemical properties of soils. This study aimed to evaluate the changes in the chemical characteristics of Planosolo Nátrico submitted to irrigation with wastewater (AR). The study was conducted in the experimental area of water reuse for forestry purposes of the Instituto Nacional do Semiárido (INSA) in factorial 2 x 2, four treatments evaluated in two application periods, before the implementation of the experiment and after 17 months of application . Soil samples were collected in the irrigation line in two depths (0-15 and 15-30 cm), drip irrigated with wastewater (14 L day-1), with a row for each planting. There was no significant difference for pH, Na+, K+, sum of bases (SB), base saturation (V), effective CTC and CEC. There was a significant change to the content of soil organic matter, P, N, Ca+2, Mg+2, H + Al and Ca: Mg ratio. The application of wastewater can be a viable alternative for improvement of some chemical parameters and soil fertility in arid and semi-arid areas, but should have monitoring of water quality and soil quality.