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Research on Sweet sorghum Biomass and partitioning BIN ZHANG1, 2, J. SPIR2, 3, LI PU HAN2,4, ZU XIN LIU1, 2 AND GANG HUI XIE1, 2* College of Agronomy and Biotechnology China Agricultural University, Beijing-100 193 P. R. China *(e-mail : hlk12@) (Received : October 2012) ABSTRACT Sweet sorghum turned out to be a crop that is well-adapted to the prevailing conditions in north -west China if water availability is secured. Hybrid cultivars ZS 1 and CT 2 were the most promising sweet sorghum cultivars for multi-purpose biomass production, because of the high AGDB varying between 25.1 and 29.0 t/ha and a grain yield centering around 11.2 t/ha. Inbred cultivar Rio was the best performer in stem dry biomass, a potential feedstock for biofuel. In conclusion, biomass and grain yields of hybrid cultivars of sweet sorghum turned out to be higher than those of inbred cultivars.Nitrogen supply affected plant height, stem dry biomass, leaf dry biomass and AGDB significantly, but not grain yield. In addition, regardless of cultivars, nitrogen fertilizers improved the stem proportion, but decreased the grain proportion thus lowering the harvest index. Further in-depth studies on nitrogen responses at various levels of water supply are needed. Key words : Crop growth rate, energy crop, genotypes, grain yield, nitrogen fertilizer, Sorghum bicolor (L.) Moench INTRODUCTION Sweet sorghum is considered as one of the potential energy crops throughout the world, for its wide range of adaptability (Gnansounou et al., 2005; Kangama and Rumei, 2005; Calvino and Messing, 2012), including its tolerance to drought and salinity (Tsuchihashi and Goto, 2004; Rajagopal, 2008; Wortmann et al., 2010), and a remarkable yield potential even in marginal environments (Cosentino, 1996; Foti et al., 1996; Steduto et al., 1997; Amaducci et al., 2004). In China, the current agricultural policy encourages to develop sweet sorghum production on marginal agricultural land in order to grow energy crops without