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The purpose of this study was to investigate the potential of grasses (and of Italian ryegrasses in particular) for supplying water-soluble carbohydrate (WSC), as well as to examine the potential of the WSC component for ethanol production and of residual grass for animal feed. WSC production of 5 Italian ryegrass cultivars and of 17 other cultivars was examined. It was concluded that soil moisture and temperature had a major influence on WSC production. Grass juice extraction was achieved in yields exceeding 60% of fresh grass. It was necessary to treat extracts at pH 2 for 15 minutes at 90 in order to ensure quantitative conversion of WSC in grass juice to ethanol using yeast. Average yields of WSC ranged from 2.94 and 2.80 t/ha in 1987 and 1988 to 4.59 and 5.05 t/ha in 1982 and 1986, respectively. This converts to 984 and 970 l/ha of ethanol in 1987 and 1988 and 1508 and 1666 l/ha in 1982 and 1986, respectively. These results indicate that grass dewatering produces a liquid fraction suited to ethanol production and a partially dried solid fraction which may have advantages over fresh grass in cost and convenience of preservation, with only small loss of quality.

Additional information

Authors: MCGRATH D, An Foras Taluntais, Dublin (IE)
Bibliographic Reference: EUR 13026 EN (1990) 33 pp., MF, ECU 4, blow-up copy ECU 5
Availability: (2)
Record Number: 199110068 / Last updated on: 1994-12-02
Original language: en
Available languages: en