Study of Different Nitrogen for Phosphorus Accumulation of Flue-cured Tobacco and Utilization of Phosphorus

To study phosphorus accumulation in roots,stem,leaf of flue-cured tobacco and utilization of phosphorus of flue-cured tobacco on chernozem,the experiment with three different nitrogen application of 0,52.5,and 67.5 kg·hm-2 was conducted.The results showed that:in root,the first 3～7 weeks was slow accumulation stage,7～15 weeks was the rapid accumulation stage;in stem,a rapid increase in 7～11 weeks,11～15 weeks keep stable,phosphorus accumulation was increased with nitrogen increasing.Phosphorus accumulation in leaves trended to stable increase,and always maintain N2 N1 N0;Phosphorus use efficiency increased gradually,were 10.02% and 1.74% in tobacco leaf harvested,the amount of nitrogen had no effected on phosphorus use efficiency.