The PFI research summary for 2001 reported on the composting project that PFI cooperators were carrying out with ISU scientists Tom Richard and Matt Liebman and graduate student Terry Loecke. The research had to do with the bedding-manure mix from swine hoophouses and whether composting that material is a good idea. By 2001, PFI cooperators had carried out 19 replicated trials to show that both composted and uncomposted bedding-manure could benefit crops. And PFI research had also turned up examples of nitrogen tie-up as uncomposted hoophouse bedding-manure decomposed in the soil.
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