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Alpha diversity of bacterial communities in purple prairie clover ensiled without (control) or with polyethylene glycol (PPC-p) in terminal silage (day 0) and after 7 and 14 days of aerobic exposure. Each panel represents one alpha diversity measure, as follows: Observed, total number of OTUs; Chao 1 and ACE, richness estimators to estimate the total number of OTUs present in a community; Shannon, microbial index of diversity. **, P < 0.01.
