Table 2 shows the results of the regression modeling. Results from the quadratic regression model showed a significant
effect ( p < 0.001) of straw addition rate on CH4 emissions. The effect of continuous flooding was significantly different
from the other water management practices ( p < 0.05). However,intermittently flooded, non flooding irrigated, and
rainfed water management did not differ significantly among them ( p > 0.05) in terms of CH4 emissions.