Maize genotypes and soil nitrogen apparent balance

At three soil N application levels,grain yield,shoot N accumulation and soil N apparent balance of maize genotypes were studied in the field. Significant differences were found in grain yield and shoot N accumulation among maize genotypes. Average soil N apparent residual rates ware 36.74%, 40.79% and 48.36% at low 112.5kg/hm²,medium 168.75kg/hm² and high soil N 225kg/hm² application levels separately.Maize genotypes with high shoot N accumulation could significantly decrease N fertilizer residue in the soil.