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PRESENTER NOTES
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Key Discussion
Topics
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1.Example 1: a Nebraska 11,000 head feedlot. Additional examples are attached at the end
of the power point presentation. Pick
the example most appropriate for you audience.
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2. For this feedlot, 1080 tons of nitrogen and 240 tons of
phosphorus are brought onto the farm annually. Most inputs are as purchased feeds and
purchased animals.
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3.For this feedlot, 430 tons of nitrogen and 120 tons of
phosphorus leave the farm as managed outputs annually. All outputs are as cattle sold for
slaughter.
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4.For this feedlot, the nitrogen imbalance is 650 tons
annually. Most of this nitrogen is
lost as ammonia volatilization into the atmosphere. Some excess nitrogen is added to the soil
as organic and ammonium-N. This
nitrogen is in excess of what can be used by the cropping program and it is
likely to transform to nitrate-N and move towards groundwater.
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References
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Lesson 2:
pages 11
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