THE EFFECT OF NITROGEN FERTILIZER USE AND OTHER PRACTICES ON METHANE EMISSION FROM FLOODED RICE

摘要

Methane (CH4) flux measurements from rice paddy fields in the world and its controlling factors, especially fertilizer effects are summarized. The measurements at rice paddy fields in various locations of the world showed that there were large temporal variations of CH4 flux and that the flux differed markedly with climate, characteristics of soil and paddy, application of organic matter and mineral fertilizer, and agricultural practices. From the data, it appears that identifying and controlling CH4 flux factors have a potential to reduce CH4 emission from rice cultivation. Potential mitigation options include: the form and amount of nitrogen and other chemical fertilizers, the method of fertilizer applications, the application of other chemical amendments, water management and cultivation practices.