Fig. 1. Methane production potential of soils. Samples were incubated anaerobically with a gas mixture of 75% H₂ and 25% CO₂. Bars indicate the average rate and error bars indicate the range of the rates (n = 2). M Forest = McFarland Forest, DL Prairie = Doolittle Prairie, RS Prairie = Roadside Prairie, KL Control = Kluever Control, KL Nitrogen = Kluever Nitrogen, KL Broadcast = Kluever Broadcast Manure, KL Inject = Kluever Injected Manure, WC Hill Top = Walnut Creek Hilltop, WC Sideslope = Walnut Creek Sideslope, WC Pothole = Walnut Creek Pothole, DL Farm = Doolittle Farm, RS Farm = Roadside Farm.