This study investigated the effects of two soil moisture levels (SM) (30 and 70% soil available water) and three harvests (90, 118 and 151 days after seeding) on sweet (S506) and fibre (B133) sorghum genotypes under rain sheltered conditions. Juice and bagasse-derived ethanol and their sum (EtOHBJ, EtOHB and EtOHJ+B, respectively) were assessed. Water use efficiency (WUE) was determined for sorghum dry weight (DW) and EtOHJ+B. S506 had similar DW but higher sugars content than B133, resulting in higher EtOHJ (+32%) and EtOHJ+B (+9%). High SM enhanced DW, juice and sugars content, determining a strong EtOHJ+B increase (+99% vs. low SM). Late harvest enhanced DW and EtOHJ+B (+107% vs. early harvest), despite decreasing extractives and increasing structural fibre components. Water use efficiency of EtOHJ+B improved with high vs. low SM, although differences faded in late harvest. Upscale of EtOHJ+B and WUE data indicated a range of 21,000 - 82,000 ha of sorghum cultivation and 60 - 117 Mm3 of irrigation water, as amounts of resources needed to supply an 85,000 m3 yr-1 bio-ethanol plant. This large variation in land and water needs depended on specific combinations between crop factors SM and harvests.

Crop factors Influencing ethanol production from sorghum juice and bagasse

Lorenzo Capecchi;Lorenzo Nissen;Monica Modesto;Giuseppe Di Girolamo;Luciano Cavani;Lorenzo Barbanti
2017

Abstract

This study investigated the effects of two soil moisture levels (SM) (30 and 70% soil available water) and three harvests (90, 118 and 151 days after seeding) on sweet (S506) and fibre (B133) sorghum genotypes under rain sheltered conditions. Juice and bagasse-derived ethanol and their sum (EtOHBJ, EtOHB and EtOHJ+B, respectively) were assessed. Water use efficiency (WUE) was determined for sorghum dry weight (DW) and EtOHJ+B. S506 had similar DW but higher sugars content than B133, resulting in higher EtOHJ (+32%) and EtOHJ+B (+9%). High SM enhanced DW, juice and sugars content, determining a strong EtOHJ+B increase (+99% vs. low SM). Late harvest enhanced DW and EtOHJ+B (+107% vs. early harvest), despite decreasing extractives and increasing structural fibre components. Water use efficiency of EtOHJ+B improved with high vs. low SM, although differences faded in late harvest. Upscale of EtOHJ+B and WUE data indicated a range of 21,000 - 82,000 ha of sorghum cultivation and 60 - 117 Mm3 of irrigation water, as amounts of resources needed to supply an 85,000 m3 yr-1 bio-ethanol plant. This large variation in land and water needs depended on specific combinations between crop factors SM and harvests.
Lorenzo, Capecchi; Lorenzo, Nissen; Monica, Modesto; Giuseppe Di Girolamo, ; Luciano, Cavani; Lorenzo, Barbanti
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/613329
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