I wonder if you might get nitrous oxide emissions or methane...
Dear Dr. Sarkar,
Flooded rice production causes significant amount of greenhouse gas (GHG) emissions.
Just to explain this, I will cite some recent data from a paper published in the Journal of Cleaner Production that reported the carbon footprint (Mg CO2 equivalents per 1 Mg of grain yield) of rice, wheat and maize produced in China:
Rice – 0.80 Mg CO2eq Mg-1 of grain
Wheat – 0.66 Mg CO2eq Mg-1 of grain
Maize – 0.33 Mg CO2eq Mg-1 of grain
A large proportion of GHG emitted from flooded rice fields are CH4 followed by N2O.
I cited this data because; this is a paper I could find GHG data for all three main cereal grains in one study. GHG emissions intensity (carbon footprint) of rice, wheat and maize in different countries may be slightly different due to differences in production practices, but I think the above ranking in GHG intensity may be similar in general in most countries that produce all three grains. I could forward the paper if you are interested.
Best regards.
Susantha.
There is enough scientific evidence on the subject that shows that rice produces more GHGs.
Please see the published article. If you find any discrepancy kindly write. Rice is grown in upland, lowland, rainfed as well as irrigated conditions. GHG emission differs greatly under different ecosystem. Calculation of GHG emission under different ecosytem followed by area and total emission by rice can give clear picture. However, I have no idea about total emission by rice.
What is your opinion wrt burning of paddy straw Vs. insitu incorporation.
In the light of facts given by you,which one option is less pollutive and good for overall generalisation?
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