a b s t r a c t
The objective of this study was to estimate the storage dry matter (DM) losses for
switchgrass bales that were preprocessed using an industrial baler technology prior to
storage with three particles sizes of feedstock and two types of bale wraps. Mixed models
were used to test difference in DM losses across the particle sizes, wrap materials, and
storage days. Response functions were also estimated to determine DM losses for each
particle size and wrap material at storage over time. DM losses were found to be different
across particle size, wrap material, and storage period. Specifically, the DM losses were
lower when the particle size of switchgrass baled decreased from full length to less than
two centimeters. The results show switchgrass bales stored at the smallest particle size
had lower DM losses than bales stored at the full length of feedstock. Also, applying
additional film wrap that completely covers the net wrapped bale reduced DM losses
relative to bales wrapped only in net. Furthermore, storage DM losses of preprocessed
switchgrass bales increased linearly with days in storage. Our findings suggest that
applying both net and film wrap to switchgrass bales composed by a particle size less than
two centimeters can reduce DM losses during storage. Economic analysis indicates the
price of switchgrass was also important in the choice of storage method for switchgrass.
The results provide valuable insight into improving feedstock logistics and the feasibility of
the advanced biofuels industry.
a b s t r a c tThe objective of this study was to estimate the storage dry matter (DM) losses forswitchgrass bales that were preprocessed using an industrial baler technology prior tostorage with three particles sizes of feedstock and two types of bale wraps. Mixed modelswere used to test difference in DM losses across the particle sizes, wrap materials, andstorage days. Response functions were also estimated to determine DM losses for eachparticle size and wrap material at storage over time. DM losses were found to be differentacross particle size, wrap material, and storage period. Specifically, the DM losses werelower when the particle size of switchgrass baled decreased from full length to less thantwo centimeters. The results show switchgrass bales stored at the smallest particle sizehad lower DM losses than bales stored at the full length of feedstock. Also, applyingadditional film wrap that completely covers the net wrapped bale reduced DM lossesrelative to bales wrapped only in net. Furthermore, storage DM losses of preprocessedswitchgrass bales increased linearly with days in storage. Our findings suggest thatapplying both net and film wrap to switchgrass bales composed by a particle size less thantwo centimeters can reduce DM losses during storage. Economic analysis indicates theprice of switchgrass was also important in the choice of storage method for switchgrass.The results provide valuable insight into improving feedstock logistics and the feasibility ofthe advanced biofuels industry.
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