Matt Ruark Dept Soil Sci Nav Ghimire UWEX Green Lake County Joe Lauer Dept Agronomy Thierno Diallo Dept Agronomy Controlled and delayed release Nitrogen fertilizer trials Controlledrelease ID: 764565
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Matt Ruark, Dept. Soil Sci.Nav Ghimire, UWEX Green Lake CountyJoe Lauer, Dept. Agronomy.Thierno Diallo, Dept. Agronomy. Controlled and delayed release Nitrogen fertilizer trials
Controlled-releasePolymer-coatedESN® (Agrium)The polymer coating expands with heat, allowing water in to dissolve the urea. The soluble N then diffuses out of the porous coating.Nitrogen fertilizers
Delayed releaseContains a chemical that stops part of the N cycleUrease inhibitorsInhibits conversion of urea to ammoniaNBPTAgrotainNitrification inhibitorsInhibits conversion of ammonium to nitrate DCD SuperU (contains both NBPT and DCD, impregnated into the urea granule) Nitrogen fertilizer
Is there a reliable benefit to using PCU, urease inhibitors, or nitrification inhibitors in Wisconsin?These products come at a premium so there needs to be an economic benefit when using them.Greater yield at the same rate of NSame yield with lower rate of Nquestion
Arlington, WISuperU, ESN, and ammonium nitrate (AN) on cornGreen Lake, WISuperU, Agrotain, ESN, and urea on no-till cornN fertilizer trials in Wisconsin
Part of long-term rotation and tillage study at Arlington, WIRotationCorn following cornCorn following soybeanTillageChisel plowNo-tillN applied at planting at a rate of 180 lb/ac 2009-2012 Trials
Corn Yield Prev. Crop N Source 2009 2010 2011 2012 Average bu/ac CornAN224260193172212 ESN212261186157204 SuperU213249188161203SoybeanAN246268 210 b201231 ESN240272 223 a196233 SuperU249268 201 b206231 Chisel Plow systems
Corn Yield Prev. Crop N Source 2009 2010 2011 2012 Average bu/ac CornAN207224 ab183160194 ESN207236 a186167199 SuperU207216 b177161190SoybeanAN248264 223 a203235 ESN241253 218 a182224 SuperU239255 208 b 201 226 No-till systems
Location: Green Lake CountyTwo fields per farmCorn following corn (no-till)Corn following soybean (no-till)2012 and 2013 Trials
FertilizersUreaAgrotainSuperUESNRate “recommended” vs. 20% reductionCC: 170 vs 135 CS: 150 vs 120 Controls ( unreplicated ) of 0 and 200 lb /ac N Approach
Assuming…Urea is $550/ton (~$0.60/lb-N)ESN is $750/ton (~$0.82/lb-N)If N application is 150 lb-N/ac andif corn is $4/bu, then need 8 bu /ac gain If corn is $5/ bu , then need 6-7 bu /ac gain economics
2012 corn-corn135 vs. 170 lb-N/ac
2013 corn-corn135 vs. 170 lb/ac
2013 corn-soybean120 vs. 150 lb-N/ac
These data show that yield gains when applying optimum N rates are not often nor consistently observed.The rainfall patterns of the season will create the situation where the product is valuable or not (i.e. early season intense rains).These products were applied at planting. Perhaps greater value if applied 2-3 weeks prior to planting (i.e. more time to protect).The products work, but need to be tested on your fields to find the benefit, mostly likely coming from reduced N rates. Results
Where is the value?
Questions?Comments?Concerns?