Irrigação da mamona (Ricinus communis L.) usando esgoto doméstico tratado e diferentes doses de nitrogênio e potássio

Abstract

The productivity of castor tree irrigated with water and treated sewage, using different nitrogen and potassium doses, was evaluated. Eight treatments were used, varying the concentrations of nitrogen and potassium, and getting the productivity from the areas irrigated with water and treated sewage. For the castor tree irrigated with sewage, it was observed: regarding the raceme length, the best responses were in the treatments that did not contain any fertilizer; fothe parameter “seed number”, the areas supplemented with nitrogen provided the highest productivity; for the “100 seeds weight” parameter, the best results occurred where contained the two highest nitrogen levels. For the castor tree irrigated with water, the treatments with high nitrogen concentrations provided the best results. The productivities achieved in the areas irrigated with treated sewage and nitrogen supply were the best.