Table 1.

Emission factors (EF) for rice (non-transformed data).

Dendrogram group (95% similarity)	Results of 3 factor group data
Fertiliser	Water regime	Acidity–alkalinity	EF, %
1	Mix	Continual flood	Low acid	Insufficient quality data
2	Mix	Int irrigation	High acid	0.66
NH4	Int irrigation	Low acid
Urea	Int irrigation	Low acid
Mix	Int irrigation	Neutral
Urea	Int irrigation	High acid
3	No fertilizer	Int irrigation	High acid	Control data (zero N)
4	Unknown	Int irrigation	Low acid	0.37
Urea	Keep wet	Low acid
Urea	Int irrigation	Unknown
4	Unknown	Int irrigation	Low acid	1.00a
4	Urea	Keep wet	Low acid	0.15a
5	Mix	Int irrigation	Low acid	Insufficient quality data
6	Unknown	Keep wet	Alkaline	Insufficient quality data
7	Mix	Int irrigation	Unknown	Insufficient quality data
8	Urea	Unknown	High acid	Insufficient quality data

Int irrigation = Intermittent irrigation.

^aNo zero N data, so emission factor calculated from intercept of regressions.