Effects of alternating wetting and drying versus continuous flooding on fertilizer nitrogen fate in rice fields in the Mekong Delta, Vietnam

► NH3 volatilization was responsible for the major gaseous N loss of fertilizer N. ► Denitrification was increased six-fold by AWD, but was still quantitatively insignificant. ► Approx. 10% of fertilizer N accumulated in deeper soil horizons (15-50 cm). ► AWD did not affect rice yield or fertilizer N loss.