Abstract: The technique of stable isotope¹⁵N-labelled urea was used to study the rule of nitrogen absorption ,utilization and distribution of strawberry in different N application stage. The results showed that , the treatment fertilizing N before and after flower at half dose respectively got the highest nitrogen utilization rate , and it was as much as 48.57 %; while the rate of the treatment fertilizing N after flower was the lowest , it was only 22.92 %. The rate of N-distribution in various organs existed significant difference in different N application stages , the rate of N-distribution in vegetative tissues of treatment fertilizing N before flower took up 84.93 % , but the rate of treatment fertilizing N before and after flower was 65.34 %; the distribution rate in reproductive tissues of treatment fertilizing N after flower was 47.04 % , it was much higher than the other treatment . The competition ability of reproductive tissues to¹⁵N at the later growing period was higher than vegetative tissues. At every N application
stage ,¹⁵N in each organ all attributed little to total nitrogen.

Key words: Strawberry, ¹⁵N, The utilization rate of nitrogen fertilizer, Distribution