Effect of Different Nitrogen Forms on the Flue-cured Tobacco Growth,Yield and Quality

[Objective] The fertilization of the different nitrogen forms affecting of fertilizer and the flue-cured tobacco growth and the quality of its middle-positioned leaf was studied to optimize the agricultural production and ensure the tobacco leaf quality.[Method] The difference in the growth and economic traits of flue-cured tobacco variety,Yunyan 85 as experimental material,and the quality of its middle-positioned leaf after its baking,which was resulted from the application of different nitrogen forms and its fertilization measures,was evaluated.[Results] The fertilization combined with intertillage was advantage for the flue-cured tobacco growth.The application of NO-3-N was helpful the early growth and rapid development of the flue-cured tobacco after the plastic film was removed,however in later period its growth was not as good as the tobacco plant treated with NH+4-N and the physical characteristics of its middle-positioned leaf from both two treatments was undesirable.The nitrogen-using efficiency of the tobacco plant treated with NH+4-N was stronger with higher content of nicotine,but the absorption of plant to K was inhibited because of its unique chemical property,leading to the inconsistent chemical composition in plant.[Conclusion] The reasonable application of the combination of NH+4-N and NO-3-N could promote the best tobacco plant growth with the consistent chemical composition in the plant and the highest economic value.