Effects of Fertilizer Application on Soil Available Nitrogen Dynamics and Flue-cured Tobacco Leaf Quality

In order to investigate the effect of fertilizer application on the effect of soil nitrogen and flue-cured tobacco leaf quality in Dali,Yunan province,field experiments were conducted with three treatments(control,chemical fertilizer,organic-inorganic fertilizer) on 5 representative soils in Dali.The result showed that red soil of Haihong had high fertility,thus fertilizer application was not required.Red yellow soil of Zuli,red sand soil of Xinsheng,purple oil of Bozhishu and red clay of Xiaoqiao needed to apply fertilizer to ensure tobacco growth.At the same fertilizer rate,the higher the soil available nitrogen,the higher the total nitrogen of tobacco leaves.Nitrogen supply was lower in the treatment of organic-inorganic fertilizer application at the 5 soils than chemical fertilizer treatment in early growth stage,but N deficiency was not observed for both treatments.For the soils with high available nitrogen and heavy texture,it is necessary to reduce nitrogen fertilizer application to ensure the yield and quality of tobacco.