Sunflower (Helianthus annuus L.) can be cultivated at different times of the year. Hence, this oilseed crop stands out among the viable crops to be explored in the savanna area of Roraima. However, cultivars can perform differently depending on the region they are grown. Accounting on this, a study was carried out to evaluate the effect of sowing time for this crop in Boa Vista, Roraima, utilizing six cultivars (Agrobel 910; Agrobel 920; Cargill 11; Embrapa 122; Morgan 742; and Rumbosol 91) in a split-plot scheme, in a randomized complete blocks design, with two plots (sowing time: January 20, with supplementation of water, and July 19). The sub-plots consisted of four rows, measuring 6 m each, distanciated 0.90 m; the distance between plants inside the row was 0,30 m. The cultivars cargill 11, rumbosol 91 and agrobel 910 were the most productive for cultivation in the savanna ecosystem in Roraima. The sowing of sunflower in January was more appropriate than July.
Swing time; cultivars; Helianthus annuus
