To clarify the optimal ratio of organic nitrogen(organic nitrogen in decomposed cow manure)to replace chemical nitrogen,reduce the amount of chemical nitrogen fertilizer applied,this study used field experiments to analyze the effects of partial substitution of organic nitrogen for chemical nitrogen on the agronomic traits,yield and quality,as well as the conventional chemical components of flue-cured tobacco.The results showed that in terms of agronomic traits,the 20%and 40%substitution ratios could significantly promote the growth and development of tobacco plants,and the comprehensive agronomic traits were superior to the control conventional fertilization CK and the 60%substitution ratio;In terms of economic traits,the comprehensive economic traits with a 40%substitution ratio were the best,followed by a 20%substitution ratio,but the difference between the two treatments was not significant;In terms of chemical composition of flue-cured tobacco,the chemical composition treated with a 20%substitution ratio and the coordination between various components were better.The comprehensive performance of 20%organic nitrogen substitution was the best,followed by the 40%substitution ratio,in terms of agronomic traits,economic traits,and chemical component coordination.
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