By Scout Nelson
Testing forages for nitrates can sometimes be confusing due to different reporting methods. According to Bruce Anderson from the University of Nebraska-Lincoln, some labs report nitrate concentrations (NO3-), while others report nitrate nitrogen (NO3-N).
Nitrate is composed of one part nitrogen and three parts oxygen. Therefore, nitrogen only accounts for approximately 22.6% of nitrate ions. Because of this distinction, the threshold for toxicity differs based on the reporting method. For instance, when considering NO3- results, toxicity concerns arise around 9,000-10,000 ppm. For NO3-N, it's around 2,000-2,300 ppm.
Despite these variations, is one method superior? Anderson believes neither holds an edge, as both can accurately determine feed safety. It's just a matter of conversion:
Nitrate = Nitrate Nitrogen X 4.43
Nitrate Nitrogen = Nitrate X 0.226
To avoid confusion, it's crucial to know which method your lab uses. Always check the report closely to ensure accurate understanding and interpretation of nitrate levels.
Photo Credit: minnesota-corn-growers-association
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