Equations For Rice Cultivation

Where:

CH4 Rice = annual methane emissions from rice cultivation, Gg CH4 yr-1 EF jk = a daily emission factor for i, j, and k conditions, kg CH4 ha-1 day-1 tj = cultivation period of rice for i, j, and k conditions, day Ajk = annual harvested area of rice for i, j, and k conditions, ha yr-1

i, j, and k = represent different ecosystems, water regimes, type and amount of organic amendments, and other conditions under which CH4 emissions from rice may vary

Equation 5.2 Adjusted daily emission factor

Where:

EFi = adjusted daily emission factor for a particular harvested area

EFc = baseline emission factor for continuously flooded fields without organic amendments

SFw = scaling factor to account for the differences in water regime during the cultivation period (from Table 5.12)

SFp = scaling factor to account for the differences in water regime in the pre-season before the cultivation period (from Table 5.13)

SFo = scaling factor should vary for both type and amount of organic amendment applied (from Equation 5.3 and Table 5.14)

SFsr= scaling factor for soil type, rice cultivar, etc., if available

Equation 5.3

Adjusted CH4 emission scaling factors for organic amendments

SFo = scaling factor for both type and amount of organic amendment applied

ROAi = application rate of organic amendment i, in dry weight for straw and fresh weight for others, tonne ha-1

CFOAi = conversion factor for organic amendment i (in terms of its relative effect with respect to straw applied shortly before cultivation) as shown in Table 5.14.

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