[Objective] To improve the supporting cultivation techniques of new flue-cured tobacco varieties GZ90 and GZ66.[Method]Field experiments were carried out on GZ90 and GZ66 with different levels of nitrogen application,and the effects of different levels of nitrogen application on the growth,yield and quality were explored.[Result]GZ90 had better growth and development when applied with 135 kg/hm2 of pure nitrogen,and had the highest output value. When nitrogen was applied to 135 kg/hm2,GZ66 had better growth...