Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (12): 2689-2699.DOI: 10.3969/j.issn.1004-1524.2022.12.12

• Environmental Science • Previous Articles     Next Articles

Effects of straw and straw-derived biochar returning on ammonia volatilization in tropical soil-rice system

LIN Zhiwen1,2(), ZHANG Peng1,2, WU Tianhao2,3, SHAN Ying2, ZOU Ganghua2, ZHAO Fengliang2,*(), ZHENG Guiping1,*()   

  1. 1. College of Agriculture,Heilongjiang Bayi Agricultural University,Daqing 163319, Heilongjiang, China
    2. Institute of Environmental and Plant Protection, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
    3. Center for Research and Development of Fine Chemicals, Guizhou University, Guiyang 550025, China
  • Received:2022-01-12 Online:2022-12-25 Published:2022-12-26
  • Contact: ZHAO Fengliang,ZHENG Guiping

Abstract:

Ammonia volatilization is one of the main forms of nitrogen loss in paddy fields. In the present study, soil column experiment was adopted with 6 treatments, namely, no nitrogen fertilizer (0N), straw returning (ST), straw-derived biochar returning (BI), conventional fertilization (CF), straw returning with nitrogen fertilizer (NST), straw-derived biochar returning with nitrogen fertilizer (NBI), to evaluate the effects of straw and straw-derived biochar returning on ammonia volatilization in the tropical soil-rice system. The results showed that, compared with the CK treatment, NST treatment significantly (P<0.05) reduced the pH, yet increased the NH4+-N content of surface water at the tillering stage. NBI treatment significantly (P<0.05) elevated the pH and NH4+-N content of soil, yet decreased soil NO3--N content as compared with the CF treatment. Overall, NBI treatment could inhibit ammonia volatilization under the experiment conditions, as its cumulative ammonia volatilization was significantly (P<0.05) decreased by 28.9% than that of CF treatment.

Key words: tropical soil, ammonia volatilization, rice straw, biochar

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