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Strategies to Minimize Nitrate Levels in Stressed Corn
7/26/2002
Ron F. Meyer
Area Extension Agent (Agronomy)
Colorado State University Extension
Golden Plains Area		 Ron F. Meyer, Area Extension Agent
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Authored By: Tim Stanton
Extension Feedlot Specialist
Colorado State University Extension

Attached is an article that might be of interest for those of you planning on ensiling drought stressed corn silage. Nitrates are of concern when harvesting drought stressed corn. One should consider the following strategies to minimize nitrate levels in stressed corn.
  1. Leave at least a 12 inch stubble at harvest. Nitrates accumulate at highest levels in the lowest portion of the stalk.
  2. Ensiling can reduce nitrate levels by about 50%. Therefore, sample silage for nitrate analysis no sooner than 21 days after ensiling.
  3. Cattle can adapt to higher nitrate levels in forages, if they are gradually introduced and "stepped-up" to higher nitrate levels by blending with low nitrate feeds.
  4. Make sure cattle have adequate vitamin A stores and feed low levels of urea with high nitrate feeds.
  5. Harvest corn at 35-40% moisture. Check moisture since drought stressed corn is wetter than it appears.
  6. Grain generally doesn't accumulate nitrate and therefore a high concentrate diet is at low risk for creating nitrate toxicity.
The following are potentially toxic levels of nitrate:

ppm

%

Nitrate

5000

0.5

Nitrate nitrogen

1150

0.115

Potassium nitrate

8150

0.815
Different labs report nitrate in different forms.

Go to this web site to get the complete article:
www.extension.iastate.edu/Pages/communications/drought/DL149.pdf
 
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