Previous Crop and Cultivar Effects on Methane Emissions from Drill-Seeded, Delayed-Flood Rice Grown on a Clay Soil

Figure 1

Methane fluxes over time throughout the flooded portion of the 2013 growing season from previous crop treatments averaged across cultivar at the Northeast Research and Extension Center in Keiser, Arkansas. The vertical dashed lines represent panicle differentiation (PD) and 50% heading (HDG) dates for CLXL745, Cheniere, and Taggart at 54, 58, and 61 days after flooding, respectively. Flood release occurred in 83 days after flooding. Least significant difference for the same previous crop treatment = 0.197 mg CH₄-C m⁻² hr⁻¹ and for different previous crop treatment = 0.309 mg CH₄-C m⁻² hr⁻¹. Error bars indicate standard errors for the treatment means ().