Época de semeadura sobre cultivares de sorgo sacarino

Abstract

The demand for renewable energy sources has increased and several kinds of tilth have been appraisedfor supplying raw material, among them the sorghum(Sorghum bicolor). This work was carried intending to appraise the agronomic performance of sorghum cultivars in different sowing seasons, in the Northwest region of the São Paulo state.The experiment was installed with five saccharine sorghum cultivars (BRS 506 and BRS 511, IAC-SART, BRANDES and SILOTEC 20) in portions subdivided into four sowing seasons (12/11/2013, 12/11/2013, 07/01/2014 and 02/17/2014). The utilized design was random blocks, with seven repetitions. Each experimental unit was comprised of twelve six-meter line in length. The initial population of plants was 120.000 ha-1plants in 0.50 m spacing. In the physiological maturation of grains,the following characteristics were appraised: plant height (m), culm diameter (mm), plant lodging (%), total fresh biomass productivity (t ha-1),culm biomass productivity (t ha-1), fresh leaves biomass (t ha-1) juice biomass productivity (t ha-1) and the content total soluble solids in the juice (0Brix). The sorghum productivity is influenced by the sowing season, with greater culm and juice production in the first seasons. The BRS 511 and BRS 506 were the most productive and showed great potential for use in the Northwest s region of São Paulo state.