A slow-release fertilizer containing cyhalofop-butyl reduces N2O emissions by slowly releasing nitrogen and down-regulating the relative abundance of nirK

Zewang Zhang; Gonglei Chen; Xiangyang Yu; Dong Liang; Cong Xu; Cheng Ji; Lei Wang; Hongbo Ma; Jidong Wang

doi:10.1016/j.scitotenv.2023.167493

A slow-release fertilizer containing cyhalofop-butyl reduces N₂O emissions by slowly releasing nitrogen and down-regulating the relative abundance of nirK

Sci Total Environ. 2024 Jan 1:906:167493. doi: 10.1016/j.scitotenv.2023.167493. Epub 2023 Sep 29.

Authors

Zewang Zhang¹, Gonglei Chen², Xiangyang Yu³, Dong Liang³, Cong Xu³, Cheng Ji³, Lei Wang³, Hongbo Ma⁴, Jidong Wang⁵

Affiliations

¹ Institute of Agricultural Resource and Environment, Jiangsu Academy of Agricultural Sciences, National Agricultural Experimental Station for Agricultural Environment, Nanjing 210014, China; Collage of Resources and Environment, Anhui Agricultural University, Hefei 230036, China.
² Danyang Agriculture and Rural Bureau, Danyang 445000, China.
³ Institute of Agricultural Resource and Environment, Jiangsu Academy of Agricultural Sciences, National Agricultural Experimental Station for Agricultural Environment, Nanjing 210014, China.
⁴ Institute of Agricultural Resource and Environment, Jiangsu Academy of Agricultural Sciences, National Agricultural Experimental Station for Agricultural Environment, Nanjing 210014, China. Electronic address: mhbmhb110@126.com.
⁵ Institute of Agricultural Resource and Environment, Jiangsu Academy of Agricultural Sciences, National Agricultural Experimental Station for Agricultural Environment, Nanjing 210014, China; Collage of Resources and Environment, Anhui Agricultural University, Hefei 230036, China. Electronic address: Jidongwang@jaas.ac.cn.

PMID: 37778565
DOI: 10.1016/j.scitotenv.2023.167493

Abstract

To simplify the process of the application of fertilizers and herbicides for farmers, a slow-release fertilizer containing cyhalofop-butyl (SFC) was developed to prolong the combined effect of the herbicide-fertilizer and achieve a synergistic effect on weeding and reducing N₂O emissions. A greenhouse pot experiment was conducted using five treatments: CK (no fertilizer), CF (compound fertilizers), FC (fertilizers combined with cyhalofop-butyl), FF (film-coated compound fertilizers), and SFC (a slow-release fertilizer containing cyhalofop-butyl). The findings indicated that SFC exhibited the lowest N₂O emissions, the highest paddy yield, and the highest nitrogen utilization rate among all the treatments. When compared to CF, the nitrogen release was notably delayed, leading to a significant reduction in cumulative N₂O emissions under FF and SFC. When compared to CF, N₂O emissions under FC were significantly decreased, suggesting that cyhalofop-butyl exerted a reduction role in N₂O emissions. The SFC-treated nirK abundance was significantly lower than FF and FC, suggesting that the cyhalofop-butyl of SFC interacted with film of SFC inhibited the denitrification process in the paddy soil. Thus, the SFC reduced N₂O emissions by slowing nitrogen release and down-regulating the relative abundance of nirK.

Keywords: Bacteria; Cyhalofop-butyl; Nitrogen functional genes; Nitrous oxide; Slow-release fertilizer.

MeSH terms

Agriculture
Fertilizers* / analysis
Nitrogen*
Nitrous Oxide / analysis
Soil

Substances

Fertilizers
Nitrogen
cyhalofop-butyl
Nitrous Oxide
Soil