Project Number: 5445-21660-003-03
Start Date: Dec 01, 2011
End Date: Oct 31, 2014
Species native to the tall grass prairie region and available commercially will be screened based on structural and physiological characteristics that are likely to complement, not compete with, switchgrass. Plantings of these species and sampling of existing swards will be conducted along heterogeneous topographic moisture gradients (from dry hilltops to sub-irrigated lowlands) at the Prairie Farm, a 650 acre row crop farm located 25 miles south of Brookings, South Dakota, undergoing complete conversion to native prairie monocultures and communities. Experimental design will be quadrat sampling at equally spaced intervals within replicated transects along major environmental gradients. Enterprise budgets will be constructed for each of the life-form plantings based on the field operations and inputs used with each treatment. Biomass yields from switchgrass and mixes across environmental transects will be used with enterprise budgets to evaluate profitability of biomass production as a function of landscape for a range of biomass prices, and will be used to optimize profitability and provision of ecosystem services across the farm. The economic analysis will also calculate breakeven biomass prices at the farm level and across the farm landscape relative to the returns generated by typical corn-soybean production systems. Cradle to farm-gate life-cycle analysis (LCA) will be conducted based on energy and greenhouse gas (GHG) emissions associated with input use and estimated impacts of biomass production alternatives on soil carbon and trace gas emissions. The LCA will utilize the GREET model factors for energy and GHG emissions associated with agricultural inputs.