福岡県農業総合試験場24(2005) pp99-103

 

福岡県内で生産されるイタリアンライグラスの主要無機成分含量
迅速測定のための近赤外分光法の利用価値
 
平川達也・棟加登きみ子・梅田剛利・家守紹光
(畜産環境部)
 
 福岡県内で生産したイタリアンライグラスを対象に近赤外分光法(NIRS)による主要無機成分の測定の可能性および利用法について検討した。
 MLR法とPLS法を比較した結果,MLR法で得られた検量線の精度が高くなった。カリウムについては,検量線の検定における化学分析値と近赤外推定値との相関係数が0.88,推定誤差の標準偏差が化学分析値のレンジの12%,EI値は23.3で,検量線の精度は若干低いものの,実用に充分な推定精度と考えられた。しかし,実用性の判定精度の高いRPD値は2.09であり,推定精度は非常に低いと判定された。これらの結果からこの推定値を飼料設計に用いるには困難であるが,高低の判定に利用できると考えられた。
 また,リン,カルシウム,マグネシウムのRPD値は1.19−1.76と推定精度が非常に低いため,近赤外線分析による推定にはさらに精度の向上を図る必要があると考えられた。
[キーワード:近赤外分光法,イタリアンライグラス,カリウム,MLR法,RPD ]
 
Usefulness of Near-Infrared Reflectance Spectroscopy for the Quick Determination of Inorganic Ingredient Contents in Italian Ryegrass Produced in Fukuoka Pref.
Tatsuya HIRAKAWA, Kimiko MUNEKATO, Taketoshi UMEDA and Tsugumitsu KAMORI (Fukuoka Agricultural Reserch Center, Chikushino, Fukuoka, 818-8549,Japan)Bull.Fukuoka Agric. Res. Cent. 24: 99 - 103 (2005)
 Under exmination 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×SDP/range×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 Phosphric, 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.
[Key word: Near-Infrared Reflectance Spectroscopy, Italian Ryeglass, potassium, MLR method, RPD ]

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