Abstract:

The research on the soil nitrogen (N) accumulation and transfer can be useful for understanding, explaining, or monitoring the process of nitrate leaching. Using soil inorganic N testing in different field treatments as main research method, this paper analyzed the soil N accumulation and transferring characteristics under the peasants' traditional fertilization in winter wheat/summer maize rotation fields. Results showed that NO3--N was the dominant N style remained in the winter wheat/summer maize rotation field. The soil NO3--N accumulation for conventional treatment ranged from 90.13 kg/hm2 to 426.97 kg/hm2 during the winter wheat growth period, and from 67.96 kg/hm2 to 204.32 kg/hm2 during summer maize growth period, respectively. The NO3--N accumulated in the soil which couldn’t be consumed by crop may be at potential risk of N leaching. Moreover, the paper indicated that besides of the crop consumption, the amount of N application and irrigation were all the main factors affecting the seasonal dynamic variation of soil N accumulation. Further research need to seek rational fertilization managements for improving N efficiency, reducing the agricultural non-point source pollution caused by N leaching loss.