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Chinese Journal of Applied Ecology ›› 2021, Vol. 32 ›› Issue (11): 3953-3960.doi: 10.13287/j.1001-9332.202111.022

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Effects of different nitrification inhibitors on nitrification, maize yield, and nitrogen use efficiency in red soil

CUI Lei1,4,5, LI Dong-po1*, WU Zhi-jie1, XUE Yan1, XIAO Fu-rong1,4, ZHANG Ke1,4, LI Yong-hua2, ZHENG Ye3   

  1. 1Institute of Applied Ecology, Chinese Academy of Scien-ces, Shenyang 110016, China;
    2North Huajin Chemical Industries Group Corporation, Panjin 124021, Liaoning, China;
    3Jinxi Natural Gas Chemical Co. Ltd., Huludao 125001, Liaoning, China;
    4University of Chinese Academy of Sciences, Beijing 100049, China;
    5National Field Observation and Research Station of Shenyang Agro-ecosystems, Chinese Academy of Sciences, Shenyang 110107, China
  • Online:2021-11-15 Published:2022-05-15
  • Supported by:
    This work was supported by the National Key Research and Development Program of China (2017YFD0200707).

Abstract: We examined the effects of nitrification inhibitors (NIs) on soil nitrification, maize yield and nitrogen use efficiency (NUE), aiming to screen out high efficiency stabilized ammonium chloride fertilizer in red soil. Nitrification inhibitors 2-chloro-6-trimethyl-pyridine (CP), 3, 4-dimethyl-pyrazolate phosphate (DMPP), and dicyandiamide (DCD) and their combinations were added into ammonium chloride (NH4Cl) to make six stabilized nitrogen fertilizers. With blank (CK) and NH4Cl (N) as the controls, we conducted a maize pot experiment with the same amount of nitrogen addition. The results showed that compared with the treatment of N, soil ammonium content in CP+DMPP and DMPP+DCD increased by 56%-62%, which was significantly higher than that in CP, DMPP, and DCD, while the apparent nitrification rate of red soil was significantly reduced by 33%-34%. All the six treatments with nitrification inhibitors and their combinations significantly improved biomass and nitrogen absorption efficiency of maize. Compared with the N treatment, the application of adding NIs alone was significantly higher than that of the treatments of NIs combinations, with an average of 1.3 times increase. DCD was the most efficient one in improving maize yield, nitrogen uptake, and nitrogen adsorption efficiency, which increased by 4.1, 6.3 and 4.4 times, respectively. Comprehensively, DCD performed the best in reducing cost and improving yield and nitrogen use efficiency in red soil.

Key words: nitrification inhibitor, grain yield, nitrogen use efficiency, ammonium nitrogen, nitrate nitrogen, apparent nitrification rate.