Rice variety is an important factor affecting greenhouse gas(GHG)emissions in rice field.The promotion of rice cultivars with low GHG emissions is an important measure to reduce greenhouse gas emissions.In this study,20 rice cultivars that are currently widely planted in Taihu area were selected to evaluate their CH4 and N2 O emission by the method of static chamber and gas chromatography.The results showed that all the rice cultivars could cause one methane emission peak at the heading stage,the peak range...