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Nitrous Oxide Emissions from an Ultisol of the Humid Tropics under Maize–Groundnut Rotation

^a Soil Science Division, Bangladesh Institute of Nuclear Agriculture, Mymensingh 2200, Bangladesh
^b Dep. Land Management, Univ. Putra Malaysia, 43400 UPM Serdang, Selangor D.E., Malaysia
^c Faculty of Agricultural and Applied Biological Sciences, Ghent Univ., Coupure Links 653, B-9000 Ghent, Belgium

View larger version (44K): [in a new window]   Fig. 1. Daily minimum and maximum air temperature and rainfall during the groundnut–fallow–maize–fallow period (Day 1 corresponds to 19 November 1998).

View larger version (36K): [in a new window]   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.

View larger version (23K): [in a new window]   Fig. 3. Total N2O fluxes as influenced by the different amounts and sources of nitrogen during groundnut–fallow–maize–fallow periods (NC = recommended N + crop residue, RN = recommended N only and NCM = half of the recommended N + crop residue + chicken manure). The bar(s) having common letter(s) do not differ significantly at the 5% level of Duncan's Multiple Range Test.