Applied and Environmental Soil Science

Research Article

Tillage and Fertilizer Management Effects on Soil-Atmospheric Exchanges of Methane and Nitrous Oxide in a Corn Production System

Table 4

Soil N₂O fluxes as influenced by tillage systems and ammonium nitrate (AN) and poultry litter (PL) N fertilizers using surface (SA), soil incorporation (SI), and subsurface band (BA) application methods in spring, summer, fall, and winter seasons, Hazel Green, Alabama.


	Spring	Summer	Fall	Winter	Mean flux
	N₂O flux (g ha⁻¹ day⁻¹)

Tillage systems
Conventional tillage	20.99a^†	−37.60b	−19.20b	45.05c	2.31
No-till	23.70a	14.50c	−106.30a	−19.27a	−21.84
Grass fallow	50.45b	−71.80a	122.00c	−14.95b	21.42
Fertilizer treatments
0N control	−14.15b	−8.20d	−42.34c	−501.82a	−141.63
150 kg N ha⁻¹ AN-SA	−0.22c	−15.19c	−25.14d	735.28f	173.68
150 kg N ha⁻¹ AN-SI	240.25e	−320.38a	211.48f	89.40d	55.19
150 kg N ha⁻¹ PL-SA	20.51d	86.43e	−88.04b	−14.07c	1.21
150 kg N ha⁻¹ PL-SI	−70.20a	117.09f	168.32e	186.98e	100.55
150 kg N ha⁻¹ PL-BA	19.20d	−44.69b	−305.04a	−260.97b	−147.94

Seasonal means	32.14	−30.23	−7.32	21.37

^†Means for tillage system or N fertilizer treatment within a season followed by the same letter are not significantly different at the level.