Precision Nutrient Management Brian Arnall Department of Plant
Precision Nutrient Management Brian Arnall Department of Plant and Soil Sciences Oklahoma State University
Precision Ag Class � 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.
Variable Rate Tech � Does VRT fertilizer (not lime) Result in � More uniform yield across field � More variable yield across field
Precision Nutrient Management � Land › Soil type, Slope, H 20 Movement � Soil › Soil sample �Composite, Zone, Grid › Soil EC › Soil color � Plant › Tissue › Sensor › Yield
To Each His Own � What is the problem � What is the goal � Time and Money Investment
Independence of Variables � 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
Determining the Variable � Using 1 factor to determine other unrelated factors P P Elevation K
Buffer Index Lime required (tons 100% ECCE) Buffer Index p. H 6. 8 p. H 6. 4 Over 7. 1 None 7. 1 0. 5 None 7. 0 0. 7 None 6. 9 1. 0 None 6. 8 1. 2 0. 7 6. 7 1. 4 1. 2 6. 6 1. 9 1. 7 6. 5 2. 2 6. 4 3. 1 2. 7 6. 3 3. 7 3. 2
Phosphorus Soil Test P Index % Sufficienc y P 2 O 5 lbs/ac 0 25 80 10 45 60 20 80 40 30 85 30 40 90 20 65+ 100 0
Soils Sampling
Soil Sampling
Sensors
Yield Monitor
Apps � 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. Customer based
First VRT � VRT Lime due to cost/acre and variability
Summary � Now the reasons and goals � Understand limitations � Don’t have to dive in Head first
Thank you!!! www. extensionnews. okstate. edu Brian Arnall 373 Ag Hall 405 -744 -1722 b. arnall@okstate. edu Presentation available @ www. npk. okstate. edu Twitter: @OSU_NPK You. Tube Channel: OSUNPK
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