Usefulness of near-infrared reflectance spectroscopy for the quick determination of inorganic ingredient contents in Italian ryegrass [Lolium multiflorum] produced in Fukuoka pref.
2005
Hirakawa, T.(Fukuoka-ken. Agricultural Research Center, Chikushino(Japan)) | Munekato, K. | Umeda, T. | Kamori, T.
Under examination was applicability and use of Near-Infrared Reflectance Spectroscopy (NIRS) too measurement of inorganic ingredient in the Italian Ryeglass produced in Fukuoka pref. As a result of comparing the MLR method with the PLS method, the accuracy in calibration obtained by the MLR method turned out to be higher. The accuracy of the determination was evaluated by the correlation coefficient (R), the rate of the standard deviation of prediction to the range width of a sample (SDP/range) and the evaluation index (EI=2 x SDP/ range x 100%). The 'R', SDP/range and EI of potassium were 0.88, 12%, and 23.3, respectively. Although the presumed accuracy was a little low, it was acceptable for practical use. However, the RPD value stood at 2.09 and was judged to be very low. These results indicated that although it would be difficult to use these presumed values for feed design, they may serve for determining a high or low inorganic ingredient content. The RPD value of Phosphoric, Calcium, and Magnesium was 1.19-1.76 and presumed accuracy were very low and it was thought that it was necessary to aim at improvement in accuracy further for presumption by Near-Infrared Reflectance Spectroscopy.
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