Crescimento e produção de gergelim sob irrigação com água residuária tratada e adubação com torta de mamona.

Abstract

The objective of this research was to study the effects of the treated wastewater used in irrigation and organic fertilizing using castor oil plant pie on growth and production of two sesame cultivars. The experiment was carried out in a Wastewater Biological Treatment Experimental Station, EXTRABES, at Basic Sanitation Program research group laboratories, PROSAB. The experimental design was in blocks completely at random, with three repetitions, twenty for treatments. The factors were two cultivars (CNPA G3 e CNPA G4), two qualities of water (potable supply water and treated wastewater), five dosages of castor oil plant pie in which were applied 0, 2, 3, 4, 5 t.ha-1 and four witnesses (CNPA G3 with NPK and supply water, CNPA G4 with NPK and supply water, CNPA G3 with NPK and treated wastewater and CNPA G4 with NPK treated wastewater. There were 72 experimental unities, each one constituted of a pot and a plant. The CNPA G4 cultivar showed the higher averages of height stem diameter and leaf area and fruits number compared to the CNPA G3 cultivar. In general the treated wastewater is a good nutrients source to the sesame plants providing the higher averages on the analyzed variables. The castor oil plant pie can be applied as a source of organic fertilizing to the sesame crop, answering positively to the fertilizing levels treatment, with better averages while the dose of fertilizing was increased up to a point, indicating what possibly exists a limit up to which the plants respond to the increasing of the fertilizing.