No-till Oklahoma Optimizing Nitrogen Fertilizer Through Use of Optical Sensors Brian Arnall Oklahoma State University No-till Oklahoma Why Change Notill = More Organic Matter Organic Matter is a Major Driver of N Cycle New crops, new rooting structure Higher Yields? No-till Oklahoma Sensor Based Nitrogen Rate Calculator? What is needed for a Yield Prediction Model Response Index Nitrogen Removal The calculation looks like: N Rate = {(Potential Yield Farmer Practice * RI)- YPFP}* N in Grain/NUE No-till Oklahoma SBNRC (YP0*RI =YPN) 100 Pre (100 lbs N/ac applied preplant) Yield Prediction No-till Oklahoma Reference Strips What: A high rate of N applied in, across, through, over or under each and every field How Much: Minimum of 125% of yield goal recommended rate, this includes residual and preplant. How and Where: 10 to 100 ft wide, anywhere representative. When: Winter crops; before or after sowing (1+ months), Summer crops; before or immediately after planting. No-till Oklahoma Reference Strips Are Very Visual.. BMP? Risk Aversion? Sales and Service? No-till Oklahoma Optical Sensors Numerical describe the crops BIOMASS. DOES NOT really WORK WITH OUT A REFERENCE Multiple options Companies Resolution No-till Oklahoma Optical Sensors No-till Oklahoma Sensors and No-till There is no cookie cutter recipe No Text Book Learn from others Mistakes Adopt to your farm, soil, machinery, management and mindset. Do not go 100% the first year, but put out 100% of the strips. Art No-till Oklahoma Large Scale Research Apply N-rich strip and ramp The applicator applies an N-rich strip (approx Kg/Ha N) on the left 6 ft of boom. The right 6 ft of the boom applies an N-ramp. No-till Oklahoma Sensing Sense the strips prior to hollow stem No-till Oklahoma Applying top-dress No-till Oklahoma Harvest No-till Oklahoma Results Leonard Ottawa Co min-till Corn No-till Oklahoma Results Rendel Ottawa Co No-till Sunflower No-till Oklahoma Results Johnson Ottawa Co No-till Soybean Sown Nov. No-till Oklahoma Results Red Barn Barber Co. Ks Cont Wheat No-till Oklahoma Results Linley Barber Co. Ks Cont Wheat No-till Oklahoma Results Sipel Barber Co. Ks Cont Wheat No-till Oklahoma Results Mach Canadian Co Cont Wheat No-till Oklahoma Results Bornemann Canadian Co Cont Wheat No-till Oklahoma Results CheckFarmer PracticeSBNRC Site Lbs of topdress Bushel/A c Profit/A c Lbs of topdress Bushel/A c Profit/A c Lbs of topdress Bushel/ Ac Profit/A c Leonard Rendel Johnson Red Barn Linely Sipel Mach Borne Averages No-till Oklahoma TreatmentAvg ProfitAvg YieldTotal N-rate (lbs/ac ) Farmer Practice SBNRC Flat Rate RT-200 VRT N-Rich TreatmentAvg ProfitAvg Yield Total N-rate (lbs/ac) Farmer Practice SBNRC Flat Rate RT-200 VRT N-Rich TreatmentAvg ProfitAvg YieldTotal N-rate (lbs/ac) Farmer Practice SBNRC Flat Rate RT-200 VRT N-Rich Corn Trials No-till Oklahoma Thank you!!!with a request to be added to the No-till Oklahoma Sensor Based N Fertilizer Recommendation Summary