Effects of different nitrogen on dry matter accumulation and nitrogen use efficiency of oriental tobacco

The effect of amount nitrogen-fertilizer applied on accumulation of dry matter,intensity of accumulation,root shoot ratio,yield,economic characters and nitrogen use efficiency inoriental tobacco was studied.The results indicated that the accumulation of dry matter of organs and dry weight of the whole plant was increased with the quantity of inorganic nitrogen fertilizer being added;Intensity of accumulation were raised first and then dropped down.The distributions of dry matter of organs were crepancy through the growing season;Yield and economic characters was increased;Production rate was 80.43%~140.23%,value rate was 66.90%~116.20%;The nitrogen harvest index was increased;The agronomic nitrogen use efficiency,apparent nitrogen recovery efficient,physiological nitrogen use efficiency were raised first and then dropped down;The partial factor productivity for applied nitrogen and soil nitrogen dependent rate were decreased significantly.