Nitrogen mineralization in lowland rice soils: The role of organic matter quantity and quality uri icon

abstract

  • Ammonium production in wetland soils and sediments is the key process thatimpacts nitrogen (N) availability, wetland productivity and environmentalquality. Significant relationships between organic matter content and mineralizableN have been reported for diverse groups of wetland rice soils. However,recent research also showed that in soils under intensified wetland rice productionsystems, the relationships between organic matter and mineralizable N are pooror not significant. The review of recent research suggests that both organic matterquantity and quality are influenced by prolonged submergence, which in turnaffects mineralization and N supply in wetland soils. While organic matterquantity increases following prolonged submergence of soil; submergence alsochanges the chemistry and quality of soil organic matter, which influences Nmineralization. The increase in N mineralization as a result of increase in organicmatter quantity is countered by the change in the chemistry and quality of organicmatter. The changes in chemical composition of soil organic matter and theirinfluence on N mineralization in submerged soils are discussed with examplesfrom recent research

publication date

  • 2010
  • 2010