1. No-till Oklahoma Optimizing Nitrogen Fertilizer Through Use of Optical Sensors Brian Arnall Oklahoma State University b.arnall@okstate.edu

2. 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?

3. 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

4. No-till Oklahoma SBNRC (YP0*RI =YPN) 100 Pre (100 lbs N/ac applied preplant) Yield Prediction

5. 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.

6. No-till Oklahoma Reference Strips Are Very Visual.. BMP? Risk Aversion? Sales and Service?

7. No-till Oklahoma Optical Sensors Numerical describe the crops BIOMASS. DOES NOT really WORK WITH OUT A REFERENCE.......... Multiple options – Companies – Resolution

8. No-till Oklahoma Optical Sensors

9. 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

10. No-till Oklahoma Large Scale Research Apply N-rich strip and ramp The applicator applies an N-rich strip (approx 179.2 Kg/Ha N) on the left 6 ft of boom. The right 6 ft of the boom applies an N-ramp.

11. No-till Oklahoma Sensing Sense the strips prior to hollow stem

12. No-till Oklahoma Applying top-dress

13. No-till Oklahoma Harvest

14. No-till Oklahoma Results Leonard Ottawa Co min-till Corn

15. No-till Oklahoma Results Rendel Ottawa Co No-till Sunflower

16. No-till Oklahoma Results Johnson Ottawa Co No-till Soybean Sown Nov.

17. No-till Oklahoma Results Red Barn Barber Co. Ks Cont Wheat

18. No-till Oklahoma Results Linley Barber Co. Ks Cont Wheat

19. No-till Oklahoma Results Sipel Barber Co. Ks Cont Wheat

20. No-till Oklahoma Results Mach Canadian Co Cont Wheat

21. No-till Oklahoma Results Bornemann Canadian Co Cont Wheat

22. 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 Leonard101891.05392498.184826106.11 Rendel2038191.033653246.454955247.98 Johnson301994.388439155.433933146.54 Red Barn4043214.936052229.962444209.99 Linely5059293.776059263.90761300.27 Sipel6055276.146066302.513862289.86 Mach7024118.333329129.905937155.15 Borne8031152.992842196.295948209.78 Averages 36179.085046202.834046208.21

23. No-till Oklahoma TreatmentAvg ProfitAvg YieldTotal N-rate (lbs/ac ) Farmer Practice699.19195.36235 SBNRC Flat Rate718.68189.73115 RT-200 VRT731.59190.1482.7 N-Rich688.53208.88420 TreatmentAvg ProfitAvg Yield Total N-rate (lbs/ac) Farmer Practice 729.70199.92 200 SBNRC Flat Rate 754.61198.71 115 RT-200 VRT769.43201.13100.4 N-Rich 706.52207.26 350 TreatmentAvg ProfitAvg YieldTotal N-rate (lbs/ac) Farmer Practice 825.92223.98200 SBNRC Flat Rate 835.21215.8080 RT-200 VRT 785.40201.6260.2 N-Rich 777.23224.93350 2009 Corn Trials

24. No-till Oklahoma Thank you!!! Email Jeff.Edwards@okstate.edu Chad.Godsey@okstate.edu with a request to be added to the list.Jeff.Edwards@okstate.eduChad.Godsey@okstate.edu

25. No-till Oklahoma Sensor Based N Fertilizer Recommendation Summary 2006-2008