Simulation of the responses of spring wheat yield to the rates and depths of nitrogen application in dryland based on APSIM model

• Published in: Ying yong sheng tai xue bao Vol. 33; no. 3; p. 775
• Main Authors: Yin, Jia-de, Zhang, Jun-Ying, Hou, Hui-Zhi, Zhang, Xu-Cheng, Ma, Ming-Sheng, Guo, Hong-Juan, Fang, Yan-Jie, Lei, Kang-Ning
• Format: Journal Article
• Language: Chinese
• Published: China 01.03.2022
• Subjects: APSIM; spring wheat; nitrogen application depth; nitrogen use efficiency; nitrogen application rate; yield
• ISSN: 1001-9332
• DOI: 10.13287/j.1001-9332.202202.029

Nitrogen limitation is an important factor for the improvement of crop water production potential in rain-fed areas of the Loess Plateau. The reasonable deep application of nitrogen fertilizer is a promising method to increase yield of rain-fed crop. Based on APSIM model, this study simulated spring wheat yield under different nitrogen application rates and depths, by using meteorological observation data from 1990 to 2020 in the semiarid areas of central Gansu Province, aiming to provide theoretical reference for optimizing wheat fertilization strategy. The results showed that the determination coefficient of simulated spring wheat yield, biomass and soil water content in 0-200 cm soil profile was greater than 0.80, the normalized root mean square error was less than 0.2, and the model validity index was greater than 0.5. These results indicated that the model had good fitting and adaptability in the test area. Across all the levels within the experimental design, increasing nitrogen application rates could