The experiment aimed to verify whether the addition of sugarcane mulch residue and vinasse on soil could affect seedling emergence and the initial development of three castor bean cultivars. The experiment was carried out using pots with soil, inside a glasshouse, in Campinas, State of São Paulo, Brazil, and arranged in randomized complete blocks with four replications. A three way combination of quantities of sugarcane (Saccharum spp) cv SP 803280 mulch residue equivalent to 0, 5, 10, 15 and 20 t.ha-1, quantities of vinasse equivalent to 0 and 150 m³.ha-1 and the castor bean cultivars IAC-Guarani, Íris and IAC-2028 were evaluated. Each day for 30 days, seedling emergence was counted and at the end, the speed of emergence index (SEI) and the final percentage were calculated. It was concluded that the application of vinasse decreased the seedling emergence of the castor bean cultivars IAC-Guarani, Íris and IAC-2028 but there was no damage in the seedling development with this residue. The addition of sugar cane mulch residue did not affect emergence but increased the initial development of castor bean cultivars.
Ricinus communis; agroindustry residue; straw; seed germination
