CRESCIMENTO, PRODUÇÃO E ALTERAÇÕES QUÍMICAS DO SOLO EM ALGODÃO IRRIGADO COM ÁGUA DE ESGOTOS SANITÁRIOS TRATADOS

Abstract

The scarcity of the water resources has been becoming an aggravating factor in irrigation of agricultural crops, with that the utilization of treated wastewater arises as a viable alternative to meeting that demand. In this context, the present study aimed to evaluate the effect of the use of wastewater, on growth vari-ables and yield of cotton plants. The research was conducted at Experimental Station of Biological Treatments Sanitary Sewage – EXTRABES, in the city of Campina Grande – PB, in completely randomized design with five treatments and four repetitions. When the treatment 1 (T1) – consisted of irrigation with water refueling coming from CAGEPA; the treatment 2 (T2) – irrigation with effluent coming from the UASB reactor; the treatment 3 (T3) – irrigated with effluent coming from the series of filter; the treatment 4 (T4) – irrigated with effluent coming from the anaerobic filter; the treatment 5 (T5) – irrigated with effluent coming from the ponds of macrophytes. The incremented sodium content in soil at the end of the experiment was 812.9% afforded by irrigation with wastewater coming from the UASB reactor. The application of wastewater through irrigation in cotton culture coming from the UASB reactor and filter in series have increased the concentrations of phospho-rus, potash and organic matter in surface soil layer.