- Title
- Effects of application of inhibitors and biochar to fertilizer on gaseous nitrogen emissions from an intensively managed wheat field
- Creator
- He, Tiehu; Liu, Deyan; Yuan, Junji; Luo, Jiafa; Lindsey, Stuart; Bolan, Nanthi; Ding, Weixin
- Relation
- Science of The Total Environment Vol. 628-629, Issue 1 July 2018, p. 121-130
- Publisher Link
- http://dx.doi.org/10.1016/j.scitotenv.2018.02.048
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2018
- Description
- The effects of biochar combined with the urease inhibitor, hydroquinone, and nitrification inhibitor, dicyandiamide, on gaseous nitrogen (N2O, NO and NH3) emissions and wheat yield were examined in a wheat crop cultivated in a rice-wheat rotation system in the Taihu Lake region of China. Eight treatments comprised N fertilizer at a conventional application rate of 150 kg N ha−1 (CN); N fertilizer at an optimal application rate of 125 kg N ha−1 (ON); ON + wheat-derived biochar at rates of 7.5 (ONB1) and 15 t ha−1 (ONB2); ON + nitrification and urease inhibitors (ONI); ONI + wheat-derived biochar at rates of 7.5 (ONIB1) and 15 t ha−1 (ONIB2); and, a control. The reduced N fertilizer application rate in the ON treatment decreased N2O, NO, and NH3 emissions by 45.7%, 17.1%, and 12.3%, respectively, compared with the CN treatment. Biochar application increased soil organic carbon, total N, and pH, and also increased NH3 and N2O emissions by 32.4–68.2% and 9.4–35.2%, respectively, compared with the ON treatment. In contrast, addition of urease and nitrification inhibitors decreased N2O, NO, and NH3 emissions by 11.3%, 37.9%, and 38.5%, respectively. The combined application of biochar and inhibitors more effectively reduced N2O and NO emissions by 49.1–49.7% and 51.7–55.2%, respectively, compared with ON and decreased NH3 emission by 33.4–35.2% compared with the ONB1 and ONB2 treatments. Compared with the ON treatment, biochar amendment, either alone or in combination with inhibitors, increased wheat yield and N use efficiency (NUE), while addition of inhibitors alone increased NUE but not wheat yield. We suggest that an optimal N fertilizer rate and combined application of inhibitors + biochar at a low application rate, instead of biochar application alone, could increase soil fertility and wheat yields, and mitigate gaseous N emissions.
- Subject
- biochar; inhibitor; gaseous N emissions; mitigation; paddy soil; SDG 2; Sustainable Development Goals
- Identifier
- http://hdl.handle.net/1959.13/1466453
- Identifier
- uon:47549
- Identifier
- ISSN:0048-9697
- Language
- eng
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