New Minnesota Nitrogen Rate Guidelines

Maximum Return to

Nitrogen 120-165 #/A

.10 ratio corn-corn

N Price to Crop Value Ratio

• N price—fall 2007– NH3=$530/ton or .34¢ / lb. Actual N

• Some reports of >$700/ton .43 ¢/lb. Actual N

– Urea=$460/ton or .50¢ / lb. Actual N (spring 07)– 28% =$270/ton or .48 ¢ / lb. Actual N (spring 07)

• Corn price per bushel– Current cash price= $3.50 per bushel– .34 ¢ / lb. Actual N divided by $3.50=.10 ratio– .50 ¢ / lb. Actual N divided by $3.50=.14 ratio

MRTNUM N Rec @ .05 Ratio 100 120UM N Rec @ .10 Ratio 90 110UM N Rec @ .15 Ratio 80 100UM N Rec @ .20 Ratio 70 852001 UM N Recommendations (Previous) Yield Goal Ranges < 100 100-124 125-149 150-174 175-199 200+Organic Matter

Low 60 90 120 150 170 190Medium - High 30 60 90 120 140 160

Low End of Acceptable Range (Same as Medium Productivity)

Corn Following Soybeans

High End of Acceptable Range140125115100

New v.s. Old N Rate Differences

Corn following Soybeans

MRTNUM N Rec @ .05 Ratio 155UM N Rec @ .10 Ratio 140UM N Rec @ .15 Ratio 130UM N Rec @ .20 Ratio 1202001 UM N Recommendations (Previous)Yield Goal Ranges < 100 100-124 125-149 150-174 175-199 200+Organic Matter

Low 100 130 160 190 210 230Medium - High 70 100 130 160 180 200

130

Low End of Acceptable Range (Same as Medium Productivity)

100110120

Corn Following Corn

High End of Acceptable Range180165150140

New v.s. Old N Rate DifferencesCorn following Corn