Use of the domestic effluent from stabilization lagoon in the amaranth cultivation (Amaranthus spp)

Abstract

The aim of this work was to evaluate the effects of domestic effluent in the growth and production of fresh and dry matter of amaranth (Amaranthus spp), in greenhouse (with 50% shading). An experiment was carried out under natural conditions on greenhouse (screened with 50% of shading) in Natal-RN, Brazil, from November 7th, 2007 to February 7th, 2008. The experiment was a 5x2 factorial arrangement, with ten treatments and four replications. The treatments consisted in five different solution combinations: water of the supply system (S₁), 75% diluted sewage (S₂), 50% diluted sewage (S₃), in nature sewage (S₄) and concentration solution 0.1 g mL^-1, with fertilizer 20-10-20, applied 30 and 60 days after planting (DAP) (S₅) in an Alluvial Rough soil. Each experimental unit consisted in a plastic pot with 10 kg of soil. The results showed that there were no significant differences between treatments with supply water and in nature or diluted effluent; all were overcome by chemical fertigation. The alluvial soil showed fresh, dry biomass and grain production above the rough soil.