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RESUMO – Este trabalho objetivou avaliar o efeito da populacao de plantas e epoca de corte sobre a producao de sorgo sacarino. O experimento foi instalado em novembro de 2012, em Lavras–MG. O delineamento experimental foi o de blocos casualizados, com 3 repeticoes, em esquema fatorial 4x4 (4 populacoes: 70, 100, 130 e 160 mil plantas ha-1; 4 epocas de corte: 0 dias apos o florescimento (DAF), 10 DAF, 20 DAF e maturidade fisiologica aos 40 DAF. A partir da analise do caldo sacarino da cultivar BRS 506, foram avaliadas as caracteristicas industriais: volume de caldo (VC), solidos soluveis totais (obrix), acucares redutores totais (ART) e toneladas de brix por hectare (TBH). O aumento das populacoes propicia o maior VC e nao afetou as demais variaveis. As caracteristicas industriais sao influenciadas pelas epocas de corte. O brix e a ART apresentaram crescimento linear com o aumento do periodo apos o florescimento para o corte de plantas. A maior produtividade (VC e TBH) foi obtida proxima aos 17 e 14 DAF, respectivamente, favorecendo maior producao de etanol nesses estadios. Palavras-chaves: sorghum bicolor, brix, biocombustivel. EFFECT OF PLANT POPULATION AND HARVEST TIME ON SORGHUM SACCHARINE YIELD ABSTRACT- The present work aimed to evaluate the sorghum saccharine cultivar BRS 506 regarding industrial characteristics related to yield and production of ethanol related to plant population and harvest time. The experiment was carried out in November 2012, in Lavras – MG. A randomized blocks experimental design was used, with three replications, in a 4x4 factorial scheme [4 populations: 70, 100, 130 and 160 thousands plants per hectare; 4 cutting seasons according to flowering: 0 days after flowering (DAF), 10 DAF, 20 DAF and physiological maturity 40 DAF]. Industrial characteristics such as juice volume (JV), total soluble solid (0brix), total reducing sugars (TRS) and tones of brix per hectare (TBH) were evaluated after the analysis of saccharine juice of the BRS 506. Increased population provided higher JV. The industrial characteristics were affected by the period of cutting. The cutting at 40 DAF provided the highest 0brix and TRS. JV and TBH reached the highest values at 17 and 14 DAF, respectively, periods showing the highest production of ethanol. Key words: Sorghum bicolor, production of ethanol, brix, biofuel. |
