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Ammonium concentrations after incubation at different temperatures in high fertilizer (HF) treatments and low fertilizer (LF) treatments of OMS soil (Oppenrod, Germany). ▪, HF treatments after 6.5 weeks of incubation; •, LF treatments after 8 weeks of incubation; ▴, LF treatments after 16 weeks of incubation; and ▾, LF treatments after 20 weeks of incubation. Values are means ± standard error (n = 2).
