PERFORMANCE OF THE DRAINMOD-CREAMS MODEL WITH AN INCORPORATED NUTRIENT SUBMODEL

The CREAMS nutrients submodel and the modified DRAINMOD-CREAMS model w ere applied to subsurface drained and nonsubsurface drained fields. Th e CREAMS nutrient submodel overestimated the total nitrogen losses fro m the subsurface drained and the nonsubsurface drained fields by 61 an d 91%, respectively. The modified DRAINMOD-CREAMS model overestimated the total nitrogen losses from the subsurface drained and the nonsubsu rfaced drained fields by 36 and 40%, respectively. The modified DRAINM OD-CREAMS model significantly improved the simulation of the nitrogen losses from the subsurface drained and the nonsubsurface drained field s by reducing the error by 25 and 51%, respectively.