Acta Agriculturae Scandinavica · 1989 · 395 citations · 3 references
AgricultureAgronomyCrop SciencesFood AnalysisPlant NutritionRuminant NutritionCrop NutritionForage NutritionNitrogen NutritionGrass SilageNitrogen Content EstimationPlant-available Nitrogen
The LECO FP‑228 N‑determinator was used to measure nitrogen in animal and plant samples and its results were compared to Kjeldahl determinations. The FP‑228 showed excellent reproducibility (≤2%) but produced higher nitrogen values (>5% difference) for certain samples such as maize, hay, and silages, while it agreed well with Kjeldahl for most feeding materials. Keywords: N‑determinator, Kjel‑foss, nitrate.
Abstract Abstract LECO FP-228 N-determinator has been tested and nitrogen contents in samples of both animal and plant origin have been measured. The results were compared to nitrogen contents obtained by Kjeldahl determinations (Kjel-foss). Reproducibility and repeatability were excellent in FP-228 (within 2%) except in samples like maize, hay, corn silage and maize silage. Good agreement was found between the two methods when analysing feeding stuff, barley, wheat, oat, soy bean, bonemeal, fishmeal, pea, molasse, chicken and lamb. Analyses of maize, hay, grass, straw, grass silage, maize silage, sugar beet and potato resulted in greater differences (>5%), FP-228 with the highest results. The differences might be explained by nitrate in a few of the samples tested, but in the other samples tested there were no obvious explanations. Key words: N-determinatorKjel-fossKjeltecnitrate
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The Kjeldahl method for organic nitrogen.
R. B. Bradstreet · 1965 · 452 citations