Nitrogen in the Soil Amber Moore, University of Idaho David - - PDF document
12/24/2014 Nitrogen in the Soil Amber Moore, University of Idaho David Tarkalson and David Bjorneberg, USDA Agricultural Research Service Median Nitrate-N Concentrations In TFCC return flow 3.0 Nitrate-N Concentrations (mg/L) 2.5 2.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0
Cedar Draw Deep Creek Mud Creek Rock Creek Main Canal Nitrate-N Concentrations (mg/L) 1968-1970 2006-2008
No nitrate in surface runoff Nitrate in return flow is from subsurface drains
1 6 7 9 3
Clears Springs Foods Snake River Farm
100,000 200,000 300,000 400,000 500,000 600,000 700,000 1990 1995 2000 2005 2010 Corn Acres
2 acres of corn have been added for every 3 cows
N Intake 211 mill lbs/yr NH3 emissions 55 mill lbs/yr Fecal + Urine N 62 + 87 = 149 mill lbs/yr 101 95 56
50 50 100 100 15 150 200 00 250 300 00
N A Avai ailab lable le (lb lb/ac acre re/year ar)
Ammonia Manure Fertilizer Milk N 53 mill lbs/yr
Manure N Export 94 mill lbs/yr
Based on data from The Fertilizer Institute, NASS, research studies, and estimations of N excretion .
Soil Nitrogen (NO3-N + NH4-N) in 0-2 ft (lb/a) Fall 2012 Fall 2013 Spring 2014 2012 Crop* 2013 Crop Fertilizer (lb N/a) Corn 142 Barley 120 146 117 Corn 142 Fallow 241 277 Corn 142 Camelina 50 184 196
* Applied 185 lb/a N in spring 2012 for corn.