Applied and Environmental Soil Science / 2011 / Article / Tab 4

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.

SpringSummerFallWinterMean flux
N2O flux (g ha−1 day−1)

Tillage systems
 Conventional tillage20.99a−37.60b−19.20b45.05c2.31
 Grass fallow50.45b−71.80a122.00c−14.95b21.42
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−25.14d735.28f173.68
 150 kg N ha−1 AN-SI240.25e−320.38a211.48f89.40d55.19
 150 kg N ha−1 PL-SA20.51d86.43e−88.04b−14.07c1.21
 150 kg N ha−1 PL-SI−70.20a117.09f168.32e186.98e100.55
 150 kg N ha−1 PL-BA19.20d−44.69b−305.04a−260.97b−147.94

Seasonal means32.14−30.23−7.3221.37

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

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