Abstract: CH₄ emission from rice fields in the case of ap-plying different fertilizers has been detected,using automatic continuous measutement system. The result shows:fertilizer application is an important factor that affects methane emis-sion from paddy fields. An increase in organic manure applied Ieads to an increase in methane emission and chemical fertilizer to a decreases,When the amount of organic manure is dou-bled,the amount of CH₄ emission will be:16 40 g CH₄/m² in 32d.that is 1,56 times the amount of chemital fertilizer dou-bled.Normal amount applied is between the two and slightly higher than the amount doubled.Different fertilizers applied give different methane emissions from paddy fields. Methane emission from fully organic manured field is higher than that from organic plus chemical（1:1） manured field, next is that for biogas residue manured and the lowest is that for fully chemical fertilizer which is 1/5 less than that of the fully or-ganic manure. Among the organic manured fields,the field that receivers human and animal excrements gives the highest methane emission, the green manured field takes the second place and the biogas residue and rice straw manured fields givelowest methane emission. And therefore,the multistage uti-lization of organic manure is a way to decrease methane emis-sion from paddy fields. 

Key words: fertilizer, paddy field, methane, automaticdetecting