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2/20/2007 On-The-Go Grain Protein Monitors Dan Long USDA-ARS Pendleton, OR
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2/20/2007 Questions What kinds of sensors are there? What kinds of sensors are there? How do they work? How do they work? How well do they work? How well do they work? What can I do with the information? What can I do with the information?
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2/20/2007 Near Infrared Analysis Typical molecules include CH, OH and NH and their related chemistries regarding constituents (protein, fat, oil, glycerin, water, methanol). Typical molecules include CH, OH and NH and their related chemistries regarding constituents (protein, fat, oil, glycerin, water, methanol).
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2/20/2007 Principle of Operation Transmittance Detector Sample Cell NIR Radiation Light Source
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2/20/2007 Principle of Operation Reflectance Detector Grain Stream NIR Radiation Light Source
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2/20/2007 Mode of Operation On-Line sensor grain stream
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2/20/2007 Mode of Operation In-Line sensor grain stream
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2/20/2007 Zeltex AccuHarvest Handheld Computer Inlet Outlet Sampling Device
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2/20/2007 Zeltex AccuHarvest
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2/20/2007 NIR Technology Cropscan 2000G spectrometer fiber optic cable
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2/20/2007 outlet inlet fiber optic cable sampling device
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2/20/2007 outlet inlet fiber optic cable sampling device
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2/20/2007 Dsquared Development ProSpectra™
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2/20/2007
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AccuHarvest Field Tests
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2/20/2007 AccuHarvest Vs. Reference Protein SEP=0.49%
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2/20/2007 Map Comparison
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2/20/2007 Cropscan 2000G
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2/20/2007 Cropscan Vs. Reference Protein R 2 = 0.99 SEP = 0.19% SEP=0.66%
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2/20/2007 Map Comparison
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2/20/2007 Overall Precision y = 1.07x - 1.25 R 2 = 0.71 SEP=0.9% R2 = 0.9 SEP=0.9
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2/20/2007 ProSpectra™
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2/20/2007
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Volunteer Wheat Pea-Wheat-Fallow No-Till Continuous Wheat No-Till Wheat-Fallow
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2/20/2007
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Verify protein response to applied N Verify protein response to applied N Identify N management zones Identify N management zones Evaluate N sufficiency for yield Evaluate N sufficiency for yield Estimate N removed in grain Estimate N removed in grain Estimate N required to reach protein level Estimate N required to reach protein level Estimate straw yield Estimate straw yield Nutrient Management Opportunities
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2/20/2007 Verify Protein Response
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2/20/2007 Identify Management Zones 1999 H MH M ML L ZONE
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2/20/2007 Ave. Protein (1997) & Soil N (1999)
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2/20/2007 1997 1999 Map Comparison of Differing Years
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2/20/2007 Evaluate N Sufficiency For Yield Critical Protein Wheat Class LocationStudy 11.5HWColorado Goos et al. 1984 13.2HRSMontana Engel et al. 1999 12.5HRWMontana Engel et al. 2005 12.8HRSSask. Seles & Zentner 2001 8.8SWWOregon Glenn et al. 1988
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2/20/2007 Where Was N Deficient for Yield? knoll bottom 60 bu/a 11% protein 30 bu/a 14% protein
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2/20/2007 Yield Map Interpretation sufficientdeficient
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2/20/2007 N Management Strategy N Removed = (Yield Protein) (100 5.7) N Removed = (Yield Protein) (100 5.7) N Deficit = (Target Level - Current Level) N Unit Equivalent N Deficit = (Target Level - Current Level) N Unit Equivalent Site Specific Management Guideline #24 (http://www.ppi-far.org/ssmg) Site Specific Management Guideline #24 (http://www.ppi-far.org/ssmg)
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2/20/2007 Precision N Management
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2/20/2007 90 5 30 50 70 Spatially Variable Vs. Uniform
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2/20/2007 Grain Protein Response
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2/20/2007 Water-N-Genotype Gradient 3 years – HR Spring Wheat 7.3” 18 bu/ac 11.5” 39 bu/ac 16.6” 65 bu/ac
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2/20/2007
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Fertilizer N Equivalent Applied N (lb ac -1 ) 12-22 lb N Grain Protein (%)
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2/20/2007 Straw Yield Prediction
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2/20/2007 Limitations of Technology Precision and bias Precision and bias –Vibration –Foreign material –Wear and build up –Field to field differences in grain Transfer of calibration Transfer of calibration –Each instrument is slightly different –Thermal stability –Harvested grain differs from that used for calibration
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2/20/2007 Protein Indices are Imperfect Climate: may not be suited for rainfall regimes where yield potential exceeds 60 bu/ac Climate: may not be suited for rainfall regimes where yield potential exceeds 60 bu/ac Genotype: some cultivars do not experience yield loss when protein is below the critical level (Fowler, 2003) Genotype: some cultivars do not experience yield loss when protein is below the critical level (Fowler, 2003) Weather-soil interactions: Weather-soil interactions: –Influences mineralizable N and plant N uptake –Excess N leads to yield reductions under severe drought –Protein is abnormally elevated under severe drought (Seles and Zentner, 2001)
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2/20/2007 Towards Improved PNM Previous season Previous season –Grain yield and protein sensing –Assess N sufficiency –Identify management zones –Retrospective assessment
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2/20/2007 Towards Improved PNM Pre-season Pre-season –Soil testing/soil sensing approaches –Model potentially mineralizable N –Proactive assessment In-season In-season –Proximal/remote crop sensing –SPAD chlorophyll/tissue testing –Real-time assessment
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2/20/2007
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