The parameter A(i) is spatially varying and is estimated from rice cropland map. The spatial variability of Y(i), RPR(i)
and F(i) among the cropland polygons under study could not be considered. Therefore, based on a 5-years (2003e2007)
average rice yield data for Sonitpur district (where the present study area falls) as reported by Ministry of Agriculture (India),
a uniform value of Y(i) is taken as 1.32 tonne ha1 [35]. On the other hand, field and laboratory analysis of collected rice
straw samples are done to determine the values of RPR(i) and F(i) as 1.5 and 0.5, respectively.