Effects of organic fertilizers produced by different production processes on nitrous oxide and methane emissions from double-cropped rice fields

Hu, M., Wade, A. J. ORCID: https://orcid.org/0000-0002-5296-8350, Shen, W., Zhong, Z., Qiu, C. and Lin, X. (2023) Effects of organic fertilizers produced by different production processes on nitrous oxide and methane emissions from double-cropped rice fields. Pedosphere. ISSN 1002-0160 doi: 10.1016/j.pedsph.2023.03.006

Abstract/Summary

Rice fields are a major source of the greenhouse gases, nitrous oxide (N2O) and methane (CH4). Organic fertilizers could potentially replace inorganic fertilizers to meet the nitrogen requirement for rice growth, yet the simultaneous effects of organic fertilizers on N2O and CH4 emission and yield in paddy fields are poorly understood and quantified. Experimental field plots were constructed in conventional double-cropped rice paddy-fields in the Pearl River Delta, China. A no fertilizer control (CK) plus five fertilizer treatments were applied: fresh organic fertilizer (FOF), successively composted organic fertilizer (SOF), chemical composted organic fertilizer (COF), chemical composted organic fertilizer with inorganic fertilizer (COIF), and chemical fertilizer (CF). Following all treatments, the paddy field soil was a N2O sink (-196 to -381 g N ha-1) and simultaneously a CH4 source (719 to 2178 kg ha-1). Compared with CF, the effect of organic fertilizers on N2O emission was not significant. In contrast, the total CH4 emission of the whole year in FOF, COF, SOF, and COIF increased by 157% (P < 0.05), 132% (P < 0.05), 125% (P < 0.05) and 37% (P > 0.05), respectively. The result demonstrates COIF can maintain rice yield and not significantly increase CH4 emissions from paddy-fields characterized by a prolonged period of flood inundation. An important next step is to up-scale these field-based measurements to larger rice cultivation areas to quantify the regional and national-scale impact on greenhouse gas emission and help determine best practice for fertilizer use.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/112490
Identification Number/DOI	10.1016/j.pedsph.2023.03.006
Refereed	Yes
Divisions	Science > School of Archaeology, Geography and Environmental Science > Earth Systems Science Science > School of Archaeology, Geography and Environmental Science > Department of Geography and Environmental Science
Publisher	Elsevier
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