Hao, R. ， Noor, H. ， Wang, P. ， Ren, A. ， Han, X. ， Zhong, R. ， Sun, M. ， Gao, Z.
2022-06-20 APPLIED ECOLOGY AND ENVIRONMENTAL RESEARCH 2022 null(卷), null(期), (null页)
High interannual variability of precipitation and unbalanced N application rate has a considerable impact on wheat (Triticum aestivum L.) production in the drylands of the Loess Plateau, China. In this study, we conducted field experiments in Wenxi County, Shanxi Province, under six N application rates (0, 90, 120, 150, 180, and 210 kg ha-1) for three consecutive years from 2014 to 2017. The years were classified as the wet (2014-2015), dry (2015-2016), and normal growing seasons (2016-2017) based on total precipitation during the growth period. The results showed that in the wet growing season, the optimum N application rate was 180 kg ha-1, improved the total water consumption during the growth period by 1.9%-13.8%, the spike number by 0.6%-10.9%, the yield by 2.8%-14.3%, N recovery efficiency (NRE) by 15.2%-47.0%, and the economic by 4.4%-21.1%. In the normal and dry growing seasons, the optimum N application rate was 150 kg ha-1, the total water consumption increased during the growth period by 0.5%-16.3%, the spike number by 0.9%-19.8%, the yield by 0.3%-23.3%, water use efficiency by 2.5%- 12.9%, and NRE by 12.9%-59.1%, the economic improved by 0.6%-74.7%.