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Effects of Harvest Time and Ensilage on Anaerobic Digestion of Corn Stover

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  131593762,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: @2013
Authors:   Xiang Chen, Fang Liang, Wei Yan, Rolf Kloss, Kuichuan Sheng, Xianbin Bao
Keywords:   Silage corn stover methane yield anaerobic digestion energy crop

Series of batch anaerobic digestion tests were carried out to determine the biochemical methane potential (BMP) of corn stovers harvested at three different times and ensiled for three different periods. Corn stover was harvested 0 d (early harvest), 5 d (middle harvest), and 10 d (late harvest) after full ripeness. The BMP assay test was performed with three different feed to inoculum (F/I) ratios (i.e., 0.7, 1.0 and 1.5) under mesophilic condition (35±1 °C). The results showed that the F/I ratios significantly affected the methane yields for all the fresh and ensiled corn stover samples. Fresh corn stover at early harvest resulted in the highest methane yield of 344 mL/gVS. Methane yields of fresh and ensiled corn stovers at early and middle harvest were generally higher than that at late harvest. It was also found that the average methane yield of fresh corn stover was higher than that of ensiled corn stovers. This may be caused as the ensiling process was carried out under practical conditions.

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