Table 2: Analysis of variance summary of the effects of year (2018 and 2019), tillage [conventional tillage (CT) and no-tillage (NT)], site position (up-, mid-, down-slope), sampling time (1600, 2000, 2400, 0400, 0800, and 1200 hours), and their interactions on carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) fluxes measured from a silt-loam soil during the 2018 and 2019 rice growing seasons at the Rice Research and Extension Center near Stuttgart, AR.

Source of variation

CO2

CH4

N2O

 

________________ P ________________

Year

0.068

< 0.001

< 0.001

Tillage

0.051

< 0.001

< 0.001

Year × tillage

0.318

< 0.001

< 0.001

Position

0.020

< 0.001

< 0.001

Year × position

0.003

0.018

< 0.001

Position × tillage

0.071

< 0.001

< 0.001

Year × tillage × position

0.960

0.004

0.516

Time

< 0.001

< 0.001

< 0.001

Year × time

< 0.001

< 0.001

< 0.001

Tillage × time

0.641

< 0.001

< 0.001

Position × time

< 0.001

< 0.001

< 0.001

Year × tillage × time

0.379

< 0.001

< 0.001

Year × position × time

0.005

< 0.001

< 0.001

Tillage × position × time

0.726

< 0.001

< 0.001

Year × tillage × position × time

0.293

< 0.001

< 0.001