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N-Rich Strips, How and When Brian Arnall Precision Nutrient Management | Oklahoma State University 25 min Getting N right for the Year Mobile Nutrients N Yield and Environment Driven!! Make determinations based off Environment and

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SLIDE 1

N-Rich Strips, How and When

Brian Arnall

Precision Nutrient Management | Oklahoma State University

25 min

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SLIDE 2
  • Mobile Nutrients N
  • Yield and Environment Driven!!
  • Make determinations based off Environment and Plant measured in Season
  • Wheat 1.3 lbs N bu-1
  • Corn .75 lbs N bu-1

Getting N right for the Year

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SLIDE 3

Yield and Nitrogen Rate

20 40 60 80 100 120

2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 Yield (bu ac-1) Economical Opt N Rate

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SLIDE 4

Reference Strips

  • Are Very Visual..
  • Consider 0 N
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SLIDE 5

How, When, Where

  • Applicator and Source, BFY.
  • Ideal minimum size:
  • Width 10’ Length 300’
  • Rates: 40 – 80 lbs N ac. above the field rate.

CR-2277 Applying Nitrogen-Rich Strips

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SLIDE 6

Applicators

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How, When, Where

  • When:
  • Pre-plant / Pre emerge
  • 30 days Post
  • Prior to green-up.
  • Where:
  • Every Field | Zone | Cultivar
  • Representative area

CR-2277 Applying Nitrogen-Rich Strips

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SLIDE 8

N-Rich Strip N RS N RS N RS N RS

N-Rich Strip layouts

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SLIDE 9

Sensors get Get a Rate

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SBNRC

  • No Specific Time to Sense
  • Needs Planting Date and Sensing Date
  • Determines Response
  • Predicts Yield
  • Provides an accurate N Rate.

PSS-2278 Using the GreenSeeker Handheld Sensor and Sensor-Based Nitrogen Rate Calculator

NUE.okstate.edu

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SLIDE 11

2009

Farmer Practice SBNRC

Location Nrate Yield Protein NUE Nrate Yield Protein NUE

Site 1

39 23 11.91 0.18 48 26 12.08 0.22

Site 2

36 53 13.51 0.65 49 54 13.68 0.54

Site 3

84 39 0.00 39 33 0.00

Site 4

60 52 11.69 0.28 24 44 10.66 0.12

Site 5

60 59 14.42 0.02 7 61 14.54 0.72

Site 6

60 66 11.69 0.35 38 62 10.83 0.25

Site 7

33 29 10.15 0.20 59 37 10.20 0.26

Site 8

28 42 10.26 0.48 59 48 11.12 0.41 Averages 50 45 11.95 0.27 41 46 11.87 0.31 2010 Location Nrate Yield Protein NUE Nrate Yield Protein NUE

Site 1

160 63 15.16 0.10 23 62 13.05 0.06

Site 2

60 39 12.48 0.19 49 40 12.60 0.27

Site 3

60 40 12.20 0.41 72 42 11.86 0.35

Site 4

50 91 13.57 0.12 34 91 14.25 0.39

Site 5

40 65 10.89 0.08 48 67 11.06 0.13

Site 6

50 45 15.05 0.02 12 46 14.59 0.07 Averages 70 57 13.22 0.15 40 58 12.90 0.21 Total 59 50 12.54 0.22 40 51 12.35 0.27

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SLIDE 12

Regional GreenSeeker Grain Yields - 2005

20 40 60 80 100 120 140 160 180 200

Afton Choctaw County Fort Gibson Gore Pauls Valley Pittsburg County Quapaw South Coffeyville Webbers Falls 1 Webbers Falls 2

Grain Yield (bu/ac)

Check Farmer practice N-Rich GreenSeeker

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SLIDE 13

50 100 150 200 250 300 350

Afton Choctaw County Fort Gibson Gore Pauls Valley Pittsburg County Quapaw South Coffeyville Webbers Falls 1 Webbers Falls 2

Profit ($/ac)

Check Farmer practice N-Rich GreenSeeker

Regional GreenSeeker Grain Yields - 2005

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Comparison of Sensor Based N Rec’s to Soil Test Based Rec’s, 2006-2008

Manhattan 2006 160 155 60 33 33 27 Partridge 2006 48 32 42 57 55

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2 Tribune 2006 130 128 30 24 15 15 9 Manhattan 2007 111 109 130 98 105 25

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Partridge 2007 77 70 40 15 20 20

  • 5

Tribune 2007 71 79 54 54 Manhattan 2008 151 128 77 45 45 32 Ottawa 2008 58 64 56 55 60

  • 4
  • 5

Partridge 2008 140 123 41 30 15 26 15

Average 22.2 0.9

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Average Wheat Performance

Farme r Practic e Farme r Practic e

GS GS 10 20 30 40 50 60 70 80 90 100 Grain Yield, bu/ac GS 30 N Rate Applied, lb/ac NS 7% less N with GS Courtesy Wade Thomason VT

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20 40 60 80 100 120 140 160

Average Corn Performance

Grain Yield, bu/ac Sidedress N, lb/ac NS 21 % less N with GS

Farmer Practic e Farme r Practic e Sensor Sensor

Courtesy Wade Thomason VT

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2010 Percent N Reduced

51% 20% 44% 31% 6% 5% 18%

0% 10% 20% 30% 40% 50% 60%

1 2 3 4 5 6 7

Side-dress N reduction (%)

Site

Percent decrease in side-dress rate from farmer practice to GreenSeeker

Average Reduction = 25%

N reduction with equal yields.

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Clemson

  • Our work has shown that compared to uniform rate applications the

SVNA system has the potential to reduce N usage by 30 to 70% in cotton, corn and wheat productions.

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On-the Go

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End Game Zone by Response

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Thank you!!!

Brian Arnall 373 Ag Hall

405-744-1722

b.arnall@okstate.edu www.npk.okstate.edu

Twitter: @OSU_NPK www.Facebook/OSUNPK YouTube Channel: OSUNPK Blog: OSUNPK.com

www.Aglandlease.info

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