›› 2019, Vol. 31 ›› Issue (11): 1769-1778.DOI: 10.3969/j.issn.1004-1524.2019.11.01

• Crop Science • Previous Articles     Next Articles

Effects of nitrogen reduction in wheat/rape season and nitrogen fertilizer management in rice season on crop yield and nitrogen uptake in crop rotation system

MA Peng, YANG Zhiyuan, LI Yu, LIN Dan, SUN Yongjian, MA Jun*   

  1. Key Laboratory of Crop Ecophysiology and Farming System in Southwest China,Ministry of Agriculture and Rural Affairs, Crop Ecophysiology and Cultivation Key Laboratory of Sichuan Province, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China
  • Received:2019-06-14 Online:2019-11-25 Published:2019-12-04

Abstract: In order to reveal the effects of nitrogen reduction in wheat/rape season and nitrogen fertilizer management in rice season on crop yield, nitrogen uptake and partial factor productivity in crop rotation system, a field experiment of wheat-rice rotation and rape-rice rotation was conducted in 2017-2018. In this rotation system, conventional nitrogen rate (N 150 kg·hm-2 in wheat season or 180 kg·hm-2 in rape season) and reduced nitrogen rate (N 120 kg·hm-2 in wheat season or 150 kg·hm-2 in rape season) were set. Based on the application rate of 150 kg·hm-2 N in rice season, 3 models named M1-M3 were also set, of which the application rate of base fertilizer, tiller fertilizer and panicle fertilizer was 2∶2∶6, 3∶3∶4, and 4∶4∶2, respectively. It was shown that the yield, biomass and nitrogen uptake in aboveground part of wheat was significantly (P<0.05) reduced under reduced nitrogen rate in wheat season by 15.36%, 14.21% and 17.14%, respectively, yet the partial factor productivity of wheat was significantly (P<0.05) increased by 5.79% in wheat-rice rotation system. Furthermore, under the conventional nitrogen rate in wheat season, the highest rice yield was recorded in M3 model, while the highest yield, nitrogen uptake in aboveground part and partial factor productivity were recorded in M2 model under the reduced nitrogen rate in wheat season. In rape-rice rotation system, reduced nitrogen rate in rape season significantly (P<0.05) reduced the yield and nitrogen uptake in aboveground part of rape by 14.28% and 16.76%, respectively. Under both conventional and reduced nitrogen rate in rape season, the highest yield, aboveground biomass, and partial tactor productivity of rice were recorded in M3 model.

Key words: rotation, reduced nitrogen application, nitrogen fertilizer management, yield, nitrogen use efficiency

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