CO2, CH4 and N2O fluxes in an Ultisol treated with sewage sludge and cultivated with castor bean - Chiaradia, Jonas Jacob; Chiba, Marcio Koiti; Andrade, Cristiano Alberto de; Carmo, Janaina Braga do; Oliveira, Claudinei de; Lavorenti, Arquimedes (Revista Brasileira de Ciência do Solo, 2009)