A New Approach to Reactive Nitrogen Removal:Theory and Practice in a New Multi-Purpose Paddy Field

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Compared with general upland fields, the effect could be expected that nitrous oxide emission would be reduced as the twice or more. Soil moisture condition was shown toward decreasing of greenhouse emissions and strengthening of water quality purification capacity. The farmland was defined, "New Multi-Purpose Paddy Field". In the New Multi-Purpose Paddy Field, it was proven not only to the environmental conservation of reactive nitrogen, but also to be able to preserve soil and water resources with steady crop yield for each unit area. Additionally, the amount of denitrification was derived by using quadratic function type of which the variable was underground water temperature.