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• W4283736005 abstract "Abstract Denitrification in agricultural soils is responsible for the majority of anthropogenic N 2 O production. The objective of this research was to assess denitrification potential and the spatial dependence of soil N 2 O flux from claypan soils in the Central Claypan Region of Missouri. Surface soil samples (0–10 cm) were collected on a 90‐m grid from two claypan fields, one conventionally managed in a corn ( Zea mays L.)–soybean [ Glycine max (L.) Merr.] rotation with tillage and without cover crops (Field 1), and the other managed as a corn–soybean–wheat ( Triticum aestivum L.) rotation with no‐till and cover crops (Field 3). The denitrification enzyme activity (DEA) protocol was used to measure denitrification potential and actual soil denitrification rates of N 2 O and N 2 were measured with the N‐free atmospheric recirculation method (N‐FARM). In both fields, DEA fluxes were highest in the toeslope, with a rate of 1.4 kg N ha –1 d –1 in Field 1, and 1.8 kg N ha –1 d –1 in Field 3. Actual denitrification was dominated by N 2 (>85%) rather than N 2 O emissions, and it was considerably lower than DEA. Actual N 2 , N 2 O, and total denitrification (N 2 + N 2 O) fluxes were not different between fields; however, only total denitrification flux showed an effect of landscape position similar to that of DEA in both fields. Although the high smectitic clay content of upland soils provides environmental conditions suitable for denitrification, these results indicate that the accumulation of soil C in the toeslope position controlled DEA and actual denitrification rates." @default.
• W4283736005 created "2022-07-01" @default.
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• W4283736005 date "2022-09-08" @default.
• W4283736005 modified "2023-09-25" @default.
• W4283736005 title "Spatial variability of denitrification enzyme activity and actual denitrification emissions on Missouri claypan soils" @default.
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• W4283736005 doi "https://doi.org/10.1002/saj2.20457" @default.
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