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Measuring Grain Protein Concentration with In-line Near Infrared Reflectance Spectroscopy

^a USDA-ARS, Columbia Plateau Conservation Research Center, Pendleton, OR 97801
^b Land Res. and Environmental Science, Montana State Univ., Bozeman, MT 59717

View larger version (61K): [in this window] [in a new window]   Fig. 1. Components of the ProSpectra grain quality sensor including sensor head, cables, and spectrometer.

View larger version (80K): [in this window] [in a new window]   Fig. 2. The circulating chamber used to simulate dynamic grain flow conditions in the laboratory and calibrate the sensor.

View larger version (149K): [in this window] [in a new window]   Fig. 3. Combine test stand used to mount the sensor to an auger and simulate grain flow conditions found on a combine.

View larger version (121K): [in this window] [in a new window]   Fig. 4. Exit auger of combine test stand with sensor head shown optimally positioned in grain stream. Position of sensor on auger tube in relation to its sapphire lens was 30° above bottom center and centered over axis of clockwise rotating auger.

View larger version (18K): [in this window] [in a new window]   Fig. 5. (A) Calibration curve for the estimation of grain protein concentration using the ProSpectra sensor with the circulation cell, and (B) correlation between grain protein concentration predicted by in-line near infrared (NIR) spectroscopy as determined by whole grain NIR analysis of nine samples of wheat.

View larger version (34K): [in this window] [in a new window]   Fig. 6. Protein concentration vs. measurement number for repeated measurements obtained from large check samples of soft white winter wheat and hard red spring wheat.

View larger version (17K): [in this window] [in a new window]   Fig. 7. Grain protein concentrations predicted by Prospectra grain analyzer vs. the Cropscan (reference value) during the harvest of a 17-ha soft white winter wheat field.

View larger version (64K): [in this window] [in a new window]   Fig. 8. Map of grain protein concentration for 17-ha field of soft white winter wheat with smaller field areas of alternate wheat–conventional fallow (A), volunteer wheat following alternate wheat–conventional fallow (B), alternate wheat–chemical fallow (C), and alternate wheat–pea (D).