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Chinese Journal of Applied Ecology ›› 2019, Vol. 30 ›› Issue (4): 1199-1206.doi: 10.13287/j.1001-9332.201904.025

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Effects of the substitution of inorganic nitrogen by organic nitrogen fertilizer on maize grain yield and water and nitrogen use efficiency under plastic film fully mulched ridge-furrow in semi-arid area

XIE Jun-hong1,2, CHAI Qiang1,2, LI Ling-ling1,2*, ZHANG Ren-zhi1,3, WANG Lin-lin1,2, LIU Chang1,2   

  1. 1Gansu Provincial Key Laboratory of Arid Land Crop Science, Lanzhou 730070, China;
    2College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China;
    3College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou 730070, China
  • Received:2018-12-14 Online:2019-04-20 Published:2019-04-20
  • Contact: * E-mail: Lill@gsau.edu.cn
  • Supported by:
    This work was supported by the National Science and Technology Planning Project (2015BAD22B04-03), Gansu Provincial Key Laboratory of Aridland Crop Science, Gansu Agricultural University (GSCS-2017-4), National Natural Science Foundation of China (31761143004), Gansu Provincial Department of Education Project (2017C-12) and the Corn Industry System Project of Gansu (GARS-02-10).

Abstract: To improve water and nitrogen (N) fertilizer use efficiency, increase sustainable agricultural production, and explore the appropriate substitution level of inorganic N fertilizer by organic fertilizer in the semi-arid region of the western Loess Plateau, a three-year field experiment was conducted at the Dingxi Agri-ecological Station in 2016-2018. We examined the effects of commercial organic fertilizer substitution on maize grain yield as well as the use efficiency of water and N fertilizer under plastic film fully mulched ridge-furrow in dryland. There were six fertilizer treatments: T1, N fertilizer without organic fertilizer; T2, substitution 50% inorganic-N with organic-N; T3, substitution 37.5% inorganic-N with organic-N; T4, substitution 25% inorganic-N with organic-N; T5, substitution 12.5% inorganic-N with organic-N; and CK, no N fertilizer. The results showed that treatments of commercial organic fertilizer substitution (T2-T5) had higher grain yield and water and N efficiency than that in T1 treatment in dry year under 200 kg N·hm-2. The changes in grain yield and water and N fertilizer efficiency had no significant difference in treatments of commercial organic fertilizer substitution compared to T1 treatment in wet year. T2 and T3 treatments increased grain yield by 15.6% and 18.2%, and with 35.1% and 27.0% enhancement in harvest index compared to T1. T2 and T3 treatments increased water use efficiency, rainfall use efficiency, N agrono-mic efficiency and partial productivity of N fertilizer by 17.4% and 22.3%, 15.7% and 17.7%, 15.6% and 18.0%, 155.2% and 179.3%. These results demonstrated that under the same N input level, 50% and 37.5% substitution inorganic-N with organic-N could be a suitable substitution rate under plastic film fully mulched ridge-furrow, which could be recommended as a fertilizer application pattern in this area.

Key words: whole plastic mulching and double ridge-furrow, maize, nitrogen replacement, semi-arid region of Loess Plateau, yield, water and nitrogen use efficiency