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Fig. 2. Changes in the N2O flux, soil mineral N, and water-filled pore space (WFPS) with time during the groundnut–fallow–maize–fallow period as influenced by different amounts and sources of nitrogen. (A) N2O flux, (B) NH+4–N, (C) NO-3–N, and (D) WFPS (NC = recommended N + crop residue, RN = recommended N only and NCM = half of the recommended N + crop residue + chicken manure). Day 1 corresponds to 19 Nov. 1998. Arrows indicate the day of management practices as in Fig. 2A.
