Abstract
Given potato farm cropping history, the recent introduction of C4 cover crops may provide an in situ opportunity to track their residues by δ13C techniques. From 2019 to 2022 soil (0–15 cm) samples were collected on Prince Edward Island potato farms from 15 paired strips of sorghum sudangrass (SS) and C3 crops. Under C3 crops, soil δ13C was remarkably uniform at −27.7‰ ± 0.26‰, while SS cover cropping (aboveground biomass −12.8‰) significantly enriched soil δ13C values to −27.4‰ ± 0.38‰. This study demonstrates proof of concept that δ13C techniques can quantify the dynamics of C4 cover crop residues in potato farm soils.
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