Fig. 5. Methane fluxes from the Kluver agricultural site. Four treatments were present at this site including: a no N-fertilizer control (A), urea-ammonium-nitrate fertilizer (B), spring-broadcast swine manure (C), and spring-injected swine manure (D). The small circles indicate the CH4 fluxes of 16 individual chambers in 1993 and four individual chambers in 1994. The large circles are the means at each sample date. The horizontal lines indicate CH4 flux detection sensitivities.