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

Table 5

Season-long methane (CH₄) emissions as affected by previous crop and rice cultivar expressed on an area- and yield-scaled basis from the 2013 growing season on a clay soil at the Northeast Research and Extension Center in Keiser, Arkansas.

Property/effect	Cheniere	CLXL745	Taggart	Mean
Area-scaled emissions (kg CH4-C ha^−1 season^−1)
Rice	23.9	14.6	20.4	19.6
Soybean	7.0	5.8	8.1	7.0
Mean	15.5	10.2	14.2
Yield-scaled emissions (kg CH4-C (Mg grain)^−1)
Rice	2.59	1.45	2.11	2.05
Soybean	0.74	0.53	0.78	0.68
Mean	1.66	0.99	1.45

Different lowercase letters within a row for a measured property indicate differences among cultivars and different uppercase letters within a column for a measured property indicate differences between previous crop treatments ().