Varietal differences in methane emission from Korean rice cultivars

Methane (CH4) emission from eight cultivars planted under uniform field con ditions was measured by the closed static chamber method. Mean daily CH4 em ission and seasonally integrated CH4 flux followed similar trends among the different varieties, irrespective of growth duration. The CH4 flux (g CH4 m(-2)) among the varieties was in the order of Dasanbyeo (36.9) < Ilpumbyeo (42.9) < Gyehwabyeo (47.8) < Daeanbyeo (50.9) < Dongjinbyeo (58.8) < Hwase ongbyeo (59.7) < Odaebyeo (62.9) < Mangeumbyeo (76.0). No significant corre lation was observed between CH4 emission factor and root distribution in th e 0-5 cm soil profile and dry matter weight in the canopy at heading stage.