Abstract: In the  urban area of Shenyang, we sampled precipitation from February to December in the year of 2012, investigated the nitrogen (N) concentration and deposition flux from precipitation, and elucidated the possible factors influencing the variation of N deposition. The results showed that the average concentrations of NH₄⁺-N, NO₃^--N and DON were 1.57, 0.87 and 0.82 mg N·L^-1, respectively. The total N deposited from precipitation was 26.17 kg N·hm^-2·a^-1, among which the deposition of NH₄⁺-N, NO₃^--N and DON were 12.56, 7.02 and 6.59 kg N·hm^-2·a^-1, respectively. The N deposition was positively correlated with precipitation when fitted with a power equation. Seasonal fluctuations of different N forms suggested N deposition was mainly derived from the local industrial and agricultural production; in the meantime, the precipitation amount also played an important role.

Key words: water and nitrogen arrangement, seed-cotton yield, soil nitrate., dry matter accumulation, water and nitrogen use efficiency