EFEITO DE ÁGUA RESIDUÁRIA TRATADA NAS FRAÇÕES DE CARBONO E NITROGÊNIO EM PLANOSSOLO NÁTRICO
Abstract
The objective was to evaluate the effect of the application of treated wastewater on the fractions of carbon and nitrogen in a Solonetz in the Semiarid Region. The experiment was implemented in a degraded area cultivated with Freijó and Ipê-roxo. The application was started 120 days after the implementation of the experiment, at a flow of 14 L plant-1 week-1. For evaluation, soil samples were collected before and after application (0-15 and 15-30 cm layers), and the contents of Total Organic Carbon (TOC), water-soluble carbon, carbon associated with fulvic acid were analyzed. (FA-C), carbon associated with humic acid (HA-C), carbon associated with humine (HU-C), total nitrogen (TN), nitrate, ammonium and alkaline extract (AE), and were estimated the ratios C/N, C-FA/C-HA, AE/C-HU, C-FA/COT, C-HA/COT, C-HU/TC and AE/COT. The data were submitted to analysis of variance with the F test (p <0.05). The treated wastewater increased the content of humidified organic carbon and reduced the nitrate content of the soil. There was no difference between the layers.