ArticleJDS communications2026
Assessing precision and accuracy of manure volatile solids, total nitrogen, and total ammoniacal nitrogen analyses across 6 commercial laboratories.
Article in JDS communications, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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5 authors.
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Abstract
Manure nutrient analyses inform nutrient management plans and GHG emission inventories, yet the magnitude and sources of measurement variability remain under-studied for several key nutrients. To assess uncertainty in manure nutrient measurements, we quantified intra- and interlaboratory variation and analytical accuracy for volatile solids (VS), total nitrogen (TN), and total ammoniacal nitrogen (TAN) across 6 US laboratories certified by the Manure Analysis Proficiency Program. Fresh gutter-collected slurry subsamples (250 g) from a freestall barn received either an equal amount of water (control), one of 2 spike levels of glucose (for VS), or one of 2 spike levels of NH
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