Short Term Responses of Nitrogen Trace Gas Emissions to Nitrogen Fertilization inTropical Sugar Cane: Variations Due to Soils and Management Practices

摘要

Using chambers, we measured fluxes of N2O and NO following urea fertilization intropical sugar cane systems growing on a variety of soil types in the Hawaiian Islands, USA. On the island of Maui, where urea is applied in irrigation lines and soils are mollisols and inceptisols, N2O fluxes were elevated for a week or less following fertilization; maximum average fluxes were typically less than 30 ng/sq cm/h. NO fluxes were often an order of magnitude less than N2O. Together,