20 Years nitrogen dynamics study by using APSIM nitrogen model simulation for sustainable management in Jilin China

The tremendous increase in industrial development and urbanization has become a severe threat to the Chinese climate and food security. The Agricultural Production System Simulator model was used to simulate soil nitrogen in black soil in Yangling Jilin Province for 20 years. The observed values are consistent with the simulated values. The predicted values of total soil NO₃^--N and NH₄⁺-N nitrogen are 10 kg ha^-1 and 5 kg ha^-1 higher than the observed values. The total soil NO₃^--N loss has the same trend as the rainfall, and it increases with the number of rainfall days over the years. The average 20 years losses of NO₃^--N and NH₄⁺-N observed were 1375.91 kg ha^-1, and 9.24 kg ha^-1, while in the simulation increase was 1387.01 kg ha^-1 and 9.28 kg ha^-1, respectively. The difference between the observed and simulated values of NO₃^--N and NH₄⁺-N of mean loss was 11.15 kg ha^-1 and 0.04 kg ha^-1 respectively. Moreover, our findings highlight the opportunity further to improve management policies (especially for nitrogen) to maintain crop yield.