The objective of this study was to evaluate the impacts of irrigation with domestic wastewater on growth and production of seeds of castor bean (Ricinus communis L) in greenhouse. The research was carried out between November, 2005 and May, 2006, at Centro de Tecnologia e Recursos Naturais (CTRN) of UFCG - PB. A randomized block design was used, with 5 x 2 scheme of factorial analysis with three replications, testing 5 levels of replacement of crop evapotranspiration - ETc (0.60, 0.75, 0.90, 1.05 and 1.20 ETc) and 2 cultivars of castor bean (BRS Nordestina and BRS Paraguaçu). Plant height, stem diameter, number of leaves and leaf area were evaluated at 48, 90, 132 and 174 days after sowing - DAS. Production of seeds was evaluated at last date. Castor bean irrigated with 0.60 ETc in relation to 1.05 ETc, had plant height, stem diameter, number of leaves, leaf area and production of seeds reduced by 23.45, 16.14, 26.23, 44.06 and 50.59%, respectively. The BRS Paraguaçu had plant height significantly higher than the BRS Nordestina, along the research, while BRS Nordestina had larger leaf area at 48 and 90 DAS and production of seeds of both was equivalent. There was no significant interaction between the studied factors.
irrigation; evapotranspiration; domestic sewerage; Ricinus communis
