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Application Note 04: Cropscan 2000G Wheat Prediction

February 2000

Introduction
The Cropscan 2000G Whole Grain Analyser is provided with calibrations designed to simultaneously measure protein and moisture content of the major classes of wheat grown in Australia. An evaluation of the predictive ability of these calibrations is presented here including statistical analyses. NIR spectra of the different wheat classes are shown in the diagram below.

Description
26 Australian wheat samples were analysed in the laboratory for protein (Leco) and moisture (Oven) content. These samples were scanned on the Cropscan 2000G between 720-1100nm in a 20mm pathlength cell using the wheat calibration provided in the instrument. Five individual scans were recorded for each sample and the average was taken as the predicted protein and moisture values.

Results
A graphical representation of the prediction results are shown here

The following table shows the comparison of the results of the Cropscan 2000G against the laboratory data.

Conclusion
The above data shows that the Cropscan 2000G can be used to measure the protein and moisture content of wheat samples to within standards specified by the Australian Wheat Board. The Absolute Average Deviation (AAD) specification for wheat are 0.33% for protein and 0.38% for wheat. The Cropscan 2000G predicts these properties well within these limits (0.22% for protein and 0.17% for moisture).