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- W3201564684 endingPage "108421" @default.
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- W3201564684 abstract "Chemical fumigation and biofumigation are used to reduce soil-borne diseases in agricultural production systems; however, other essential soil processes such as the soil nitrogen (N) cycle may also be affected. This study compared the effects of chemical fumigation and biofumigation on soil net N mineralization, nitrification, denitrification, and soil nitrifier and denitrifier abundance. Six treatments were compared using soil microcosms over a 160-day incubation period: fumigation with chloropicrin; fumigation with metam sodium used alone (MS) or combined with barley plant residues (MSBR); biofumigation with mustard residues; addition of non-biofumigant barley residues; and an untreated control. Biofumigation did not inhibit soil nitrification, whereas chemical fumigation with MS (with or without barley) and chloropicrin inhibited nitrification for 16 and 64 days, respectively. Biofumigation, barley residues, and MSBR increased soil respiration, N 2 O emission, and denitrification rates. However, biofumigation had lower denitrification and N 2 O cumulative emissions and rates compared to barley residues, suggesting that biofumigation may reduce N 2 O production pathways. All chemical fumigation treatments significantly decreased nitrifier gene abundance compared to biofumigation; however, only chloropicrin decreased the abundance of denitrifying genes. After 160 days, 22% of the added plant residue dry matter remained in the MSBR-treated soil, which was ∼2-fold greater than the barley-treated soil, indicating chemical fumigation may also affect the carbon cycle. Overall, these results suggest that chemical fumigation, especially with chloropicrin, has a greater impact on nitrification and nitrifier and denitrifier gene abundance than biofumigation with mustard residues. • Chemical fumigation inhibited soil nitrification. • Chemical fumigation decreased nitrifier abundance compared to biofumigation. • Chemical fumigation with chloropicrin decreased denitrifier abundance. • Biofumigation reduced nitrous oxide production pathways. • Chemical fumigation had a greater impact on N cycling and N cycling microorganisms." @default.
- W3201564684 created "2021-09-27" @default.
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- W3201564684 date "2021-11-01" @default.
- W3201564684 modified "2023-09-26" @default.
- W3201564684 title "Influence of chemical fumigation and biofumigation on soil nitrogen cycling processes and nitrifier and denitrifier abundance" @default.
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- W3201564684 doi "https://doi.org/10.1016/j.soilbio.2021.108421" @default.
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