Welcome to Chinese Journal of Applied Ecology! Today is Share:

Chinese Journal of Applied Ecology ›› 2016, Vol. 27 ›› Issue (11): 3593-3599.doi: 10.13287/j.1001-9332.201611.038

Previous Articles     Next Articles

Effects of reducing N, straw returning and dicyandiamide application on winter wheat yield and nitrogen budgets in rain-fed region.

YIN Min Htun, TONG Yan-an, HAN Wen-she, HU Teng, GAO Peng-cheng*   

  1. College of Resources and Environmental Science, Northwest A&F University, Yangling 712100, Shaanxi, China
  • Received:2016-03-08 Online:2016-11-18 Published:2016-11-18
  • Contact: E-mail: pengcheng1969@nwsuaf.edu.cn
  • Supported by:
    This work was supported by Special Fund for Agro-scientific Research in the Public Interest (201103039).

Abstract: In a 3-year field experiment, effects of reducing N fertilizer, straw returning and dicyandiamide (DCD) application on wheat yield and nitrogen budgets under wheat-fallow system were studied in rain-fed region. The experiment was carried out in Yangling of Shaanxi Province, and 4 treatments were installed including no nitrogen (CK), 220 kg N·hm-2 and no straw returning (FP), 150 kg N·hm-2 and straw returning (OPT), 150 kg N·hm-2, 7.5 kg·hm-2 DCD and straw returning (OPT+DCD). The results showed there was no remarkable difference for wheat yield between OPT and FP, but the N use efficiency of the former was 6.1% more than that of the latter, and the apparent N loss ratio was 7.2% less. OPT+DCD increased the average yield of winter wheat by 10.4% and 7.9% respectively compared to OPT and FP, the N use efficiency of winter wheat increased by 20.8% and 28.1%, and the apparent N loss ratio decreased by 8.5% and 15.1%, respectively. NH4+-N content in 0-20 cm of soil increased, accordingly the NO3--N content decreased in 40 to 45 days when DCD was applied.

Key words: straw returning, N use efficiency, DCD, reducing N fertilizer