2.  Wheat Lots of $ › Sprayer, No-till/Air seeder, GPS, Yield Monitor, Combine,  Wheat a little $ › Grid, Veris, GPS Yield Monitor, Nrich and GS  Corn Lots of $ › Planter, Strip till, Zones  Corn a little $ › Planter upgrade, Gird, GS, Zone.

3.  Does VRT fertilizer (not lime) Result in  More uniform yield across field  More variable yield across field

4.  Land › Soil type, Slope, H20 Movement  Soil › Soil sample  Composite, Zone, Grid › Soil EC › Soil color  Plant › Tissue › Sensor › Yield

5.  What is the problem  What is the goal  Time and Money Investment

6.  If you want to fix everything  Don’t chase after one thing.  Yield Monitor data for › Phosphorus Potassium Lime  Soils data for › Nitrogen and Sulfur  N and S (mobile) are yield based  P and K (immobile) are soil test based  Lime is Buffer Index based

7.  Using 1 factor to determine other unrelated factors P K P Elevation

8. Buffer Index Lime required (tons 100% ECCE) pH 6.8pH 6.4 Over 7.1None 7.10.5None 7.00.7None 6.91.0None 6.81.20.7 6.71.41.2 6.61.91.7 6.52.52.2 6.43.12.7 6.33.73.2

9. Soil Test P Index % Sufficienc y P2O5 lbs/a c 02580 104560 208040 308530 409020 65+1000

14.  I have 29 Ag apps on my I-Pad › 27 were free  I use 6 regularly  Identification › weed and nutrient  Easy to use Calculators › Spray and fertilizer  John Deere, Pioneer, Monsanto, Hew Holland, ect ect ect ect. Customer based

15.  VRT Lime due to cost/acre and variability

16.  Now the reasons and goals  Understand limitations  Don’t have to dive in Head first

18. Brian Arnall 373 Ag Hall 405-744-1722 b.arnall@okstate.edu Presentation available @ www.npk.okstate.edu Twitter: @OSU_NPK YouTube Channel : OSUNPK www.extensionnews.okstate.edu