Componentes do rendimento de mamona segundo a ordem floral e época de semeadura no Rio Grande do Sul

摘要

Several factors, including sowing time, can affect the productivity and the quality of seeds. The objective of this work was to evaluate four components of the castor oil plant production as function of the sowing time and of the floral order in the "Embrapa Clima Temperado" in Pelotas, Rio Grande do Sul, Brazil in yellow clay soil type at the latitude of 31o40'53.6" S, longitude of 52o26'23.5" W and altitude of 67.10 meters. The number of bunches emitted, productivity of seeds, peel percentage and weight of a thousand seeds were evaluated for the cultivars Al Guarany 2002, IAC 80, IAC 226 and BRS 188 Paragua?u. The largest emission of bunches on castor oil plant does not lead, necessarily, to higher productivity of seeds, which varied between sowing time and floral order.