Nutrient Management: Ways to Save Money, From Simple to High Tech

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Nutrient Management Ways to Save Money, From
Simple to High Tech

• Brian Arnall
• Precision Nutrient Management
• Plant and Soil Sciences Department
• Oklahoma State University

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Rising Prices
28-0-0 500.0 0.89
Apr-07
Apr-90
Aug-08
Apr-00
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Lahoma, OK, Winter Wheat
Exp. 502, 1971-2007N rate (N uptake 100 lb/ac
- N uptake 40 lb/ac)/0.5
Optimum N Rate (assuming 40 lbs N/ac preplant)
Average YieldAvg. 60 N/ac
42.8 bu/ac
/- 12.7Avg. Loss 27.5/acre (N at 0.70/lb)
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Home Run 4
In field double-triple 12 Pop fly-out 25
In-field single 25In-field out 15
Pop-up out 10In-field grounder 9
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SBNRC (YP0RI YPN) 100 Pre (100 lbs N/ac applied
preplant)
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2007 Wheat Soil Testing and Education Program

• 57 get information from Extension
• Only 36 always apply recommended amount
• Farmer adoption of sensor based technology
• Approx 23 adoption
• 83 (320) not familiar with technology

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N-Rich Strip

• A Strip with enough N for the full season.
• Double pass with the applicator.
• Used as a Reference.

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N-Rich Strip

• Yes or No

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N-Rich Strip

• Sensor Based Nitrogen Rate Calculator
• Using Sensor Data and the Nitrogen Fertilizer
• Optimization Algorithm, N-Rates are prescribed
  for that field and its condition.

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Sensor Base N Rate CalculatorIPAQ (load-up files)
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Ramp Calibration Strip
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Ramp Calibration Strip

• The Ramp Calibration Strip
• 16 N rates
• 0 195 lb N ac-1 (can be adjusted for other
  crops)
• Rate Interval 10 ft (adjustable)
• Truck, 3pt, ATV mounted

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180 N
0 N
180 N
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Ramp Analysis

• Visual based
• Sensor Based
• SBNRC
• Ramp Analyzer

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On-Farm Progress

• 2004 300 N Rich Strips
• 2005 gt 1000 N Rich Strips (SBNRC)
• 2006
• 568 Ramps in Farmer Fields
• 1500 N Rich Strips with one Fertilizer Dealer
• Wheeler Brothers
• Servicing Approx. 230,000 acres across OK.

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On-Farm Progress

• OSU applied 520 ramps
• Wheeler Bros. (Danny Peeper) put out 480 ramps,
  fall of 2007.
• Service area gt100,000 acres

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VRT

• Variable Rate N Application
• Resolution
• Wheat .4 m2
• Corn By-Plant

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VRT Equipment
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VRT Equipment
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Economic difference of applying lime in 2005 and
2008
SOYBEAN
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Questions?
CR-2255
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In the Past OSU recommendedbanding P on low pH
soils when pH was low, on rented land,so that
high cost of liming was avoided. Now 1 ton and
30 lbsof P2O5 cost nearly the same amount