Study on the Select of Nitrogen Fertilization Models for Winter Wheat and the Effects of it on Result of Fertilizing Nitrogen

Based on the field experiments of six levels of nitrogen fertilizers for winter wheat,four fertilization models including linear plus plateau, quadratic, square root and quadratic plus plateau were comparably studied. Results indicated that these four models could be used to describe the response of winter wheat yield to nitrogen fertilizer, but the best model was linear plus plateau according to the fitness of models and optimum rates of fertiliation and recovery of fertilizer.