Cultivation of sunflower irrigated with domestic sewage treated in Quartzarenic Neosol

Abstract

The use of domestic sewage treated in irrigation as an alternative in arid regions. However, due to the high concentration of nutrients, the use these waters can soil degradation. The objective of this study was to evaluate the effect of the use of these waters on soil attributes. The experimental design was a randomized complete block design (4 x 2 x 3) in subdivided plots with four replications. The treatments consisted of three factors, four water sources in the irrigation (A1 - sewage treated by UASB reactor, A2 - treated sewage treated with anaerobic filtration, A3 - treated sewage by anaerobic filtration and A4 - water supply); two irrigation depths (L1 - equal to crop evapotranspiration and L2 - 20% higher than crop evapotranspiration) and three soil layers (0-0.2, 0.2-0.4 and 0.4-0.6 m), the three soil layers were considered as subplots. The use of water sources A1 and A2 provided lower concentrations of sodium in the saturation extract. The use of domestic sewage treated in the irrigation provided an increase in the levels of Ca2+ and Mg2+ solubles in the soil and the EC without reach it saline. Greater nutrient accumulation was verified in the shallow layer of 0-0.20 m being influenced by the effective depth of the root system as well as by the climatic conditions of the region.