Estimated daily carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) emissions from a silt-loam soil at the Rice Research and Extension Center near Stuttgart, AR across years (2018 and 2019), tillage [conventional tillage (CT) and no-tillage (NT)], and site positions (up-, mid-, and down-slope). Reported values are least square means.

Table 6: Estimated daily carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O) emissions from a silt-loam soil at the Rice Research and Extension Center near Stuttgart, AR across years (2018 and 2019), tillage [conventional tillage (CT) and no-tillage (NT)], and site positions (up-, mid-, and down-slope). Reported values are least square means.

Gas	Year	Position	Tillage	Emissions (mg m^-2 d^-1)
CO₂	2018	Up	-	24596 AB^†
		Mid		28470 A
		Down		23351 ABC
	2019	Up	-	18203 C
		Mid		21873 BC
		Down		28965 A
CH₄	2018	-	CT	11.3 BC
			NT	7.2 C
	2019	-	CT	17.5 AB
			NT	26.8 A
	2018	Up	-	5.5 CD
		Mid		3.7 D
		Down		36.0 B
	2019	Up	-	10.6 C
		Mid		4.6 D
		Down		207.8 A
	-	Up	CT	8.8 C
		Mid		6.9 C
		Down		45.7 B
	-	Up	NT	6.5 C
		Mid		2.5 D
		Down		163.8 A
N₂O	2018	Up	CT	8.9 BC
		Mid		27.1 AB
		Down		1.2 DE
		Up	NT	46.5 A
		Mid		6.5 C
		Down		1.0 DE
	2019	Up	CT	1.0 DE
		Mid		2.7 CD
		Down		3.4 CD
		Up	NT	0.5 E
		Mid		0.6 E
		Down		7.1 C

†Means with different letters within table sections, divided by horizontal lines, are different at P < 0.05.