Biogas production from galega and galega haylage | Biogāzes ražošana no galegas un galegas skābsiena
2008
Adamovics, A., Latvia Univ. of Agriculture, Jelgava (Latvia) | Dubrovskis, V., Latvia Univ. of Agriculture, Jelgava (Latvia) | Plume, I., Latvia Univ. of Agriculture, Jelgava (Latvia)
Galega (Galega orientalis Lam.) is fodder legume introduced in Latvia in last decades and have high productivity and capacity to fix atmospheric nitrogen in range 200-453 kg/ha. The 35 mixed (13 binary and 22 multi - species) swards were developed on Stagnic Luvisol and Gleyic Podzol soils during 20-years investigation period. Productivity of swards decreases by 35.2 %, if harvested four times compare to two times harvesting during the growing season. Pure galega swards provides 40-70 t/ha green biomass or 10.27-14.23 t/ha DM in a year, without application of pesticides and N-fertilizer. The average content of metabolizable energy was 10.9 or 11.4+-1.1 MJ/kg DM for pure galega or mixed galega-grass swards respectively. Split fertilisation with commercial nitrogen in amount of 90 kg/ha decreases yield of pure galega swards by 1.0 t/ha. Biogas yield from galega, and cow's manure as control was investigated in 4 laboratory scale digesters of 5 l volume. Methane yields obtained in digesters were 218.61/kgVSd from cow's manure and 384.2 1/kgVSd; 309.2 l/kgVSd; 2441/kgVSd from different galega-water and cow's manure mixtures. Estimated volumes of biogas released in 2digesters in anaerobic fermentation process of galega haylage-inoculum mixtures, having volatile solids 19.4%or 11.1%, were 1161/kgVS or 2441/kgVS after 64-days fermentation period respectively. Galega in pure stands or in mixtures with grasses is productive, persists for long period and is an acceptable plant for fodder or biogas production in climatic and soil conditions in Latvia.
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