Aims: Was to evaluate the productive potential of three sorghum agronomic groups (biomass sorghum, saccharine sorghum and forage sorghum) in two cutting seasons (crop and regrowth) and to perform the energy (GJ/ha/cycle) characterization of biomass. Sample: Six sorghum cultivars in three agronomic groups: biomass sorghum (hybrids BD 7607 and BRS 716), saccharine sorghum (hybrids BD 5404 and BRS 511) and forage sorghum (hybrids BD1615 and BRS 655). Study Design: This cultivars were evaluated in the block design at random, with six replicates and analyzed in time subdivided plots. Place and Duration of the Study: The experiment was conducted in the field being evaluated in two consecutive harvests, during the months of December/2014 to September/2015 and at the end of the cycle of each cultivar the plant evaluations were carried out.

RESUMO - Objetivou-se avaliar a produção quantitativa e qualitativa dos açúcares produzidos no caldo de sorgo sacarino, em duas épocas de corte. Utilizou-se o delineamento em blocos casualizados com 6 repetições, em parcelas subdivididas no tempo, avaliando três cultivares de sorgo sacarino (BD 5404, BRS 511 e BD1615). Ao final de cada ciclo, foram avaliados produtividade de colmos, taxa de extração, teor de sólidos solúveis (ºBrix) e os açúcares totais (sacarose, glicose e frutose) presentes no caldo, sendo estes quantificados em cromatografia líquida de alta precisão (HPLC). Verificou-se que as cultivares apresentaram a maior produtividade de colmos na safra em comparação com a rebrota, sendo 64,50 e 9,23 t ha-1, respectivamente. A taxa de extração do caldo foi menor na rebrota. O teor de açúcares totais presente no caldo não diferiu entre as duas safras, apresentando média de 94 g L-1. O ºBrix diferiu tanto entre as cultivares como entre as safras. Apenas a cultivar BRS 511 apresentou a mesma proporção de açúcares presentes no caldo, nas duas safras, com maior teor de sacarose produzido. Conclui-se que as condições climáticas afetam os caracteres agronômicos e industriais do sorgo sacarino. A cultivar BRS 511 apresentou o melhor desempenho agronômico e industrial visando à produção de etanol. A quantidade de açúcares produzidos não variou em função do ciclo, mas a qualidade dos açúcares (sacarose, glicose e frutose) variou de acordo com a cultivar.Palavras-chave: Sorghum bicolor, produtividade, açúcares fermentescíveis, HPLC. SUGARS PRODUCTION IN SWEET SORGHUM BROTH IN TWO CUTTING TIMES  ABSTRACT - The objective of this study was to evaluate the quantitative and qualitative production of sugars in sorghum broth at two cutting times. A randomized complete block design with six replications was used in plot subdivided in time evaluating three cultivars of sorghum saccharine (BD 5404, BRS 511 and BD1615). At the end of each cycle, shoot yield, extraction rate, soluble solids content (ºBrix) and total sugars (sucrose, glucose and fructose) present in the broth were evaluated, and these were quantified by high performance liquid chromatography (HPLC). Cultivars showed higher productivity of shoots in the crop compared to regrowth, with 64.50 and 9.23 t ha-1, respectively. The broth extraction rate was lower at regrowth. The total sugars content in the broth did not differ between the two harvests, with an average of 94 g L-1. Brix differed between cultivars and between crop seasons. Only the cultivar BRS 511 presented the same proportion of sugars in the broth, in the two harvests, with higher content of sucrose. As conclusion, the climatic conditions affected the agronomic and industrial characteristics of sorghum saccharine; the cultivar BRS 511 presented the best agronomic and industrial performance regarding ethanol production; the amount of sugars produced did not change with the different cycles and the quality of sugars (sucrose, glucose and fructose) varied among cultivars.Keywords: Sorghum bicolor, productivity, fermentable sugars, HPLC.