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Published online 31 January 2005
Published in Crop Sci 45:477-485 (2005)
© 2005 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Identification of Optical Spectral Signatures for Detecting Cheat and Ryegrass in Winter Wheat

Kefyalew Girmaa, J. Mosalia, W. R. Raun*, K. W. Freemana, K. L. Martina, J. B. Solieb and M. L. Stoneb

a Dep. of Plant and Soil Sciences, Oklahoma State Univ., Stillwater, OK 74078
b Dep. of Biosystems and Agric. Engineering, Oklahoma State Univ., Stillwater, OK 74078


Figure 1
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  		Fig. 1. Spectrometer and lighting system used for collecting spectral data on cheat, ryegrass, and winter wheat.

 

Figure 2
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  		Fig. 2. Reflection patterns of cheat (ch), ryegrass (ry), and wheat (wh) in the spectra between 450 and 865 nm for measurements made at Feekes 3 wheat growth stage.

 

Figure 3
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  		Fig. 3. Reflection patterns of cheat (ch), ryegrass (ry), and wheat (wh) in the spectra between 450 and 865 nm for measurements made at Feekes 5 wheat growth stage.

 

Figure 4
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  		Fig. 4. Discrimination of cheat (ch), ryegrass (ry), and wheat (wh) at Feekes 3 wheat growth stage with the discriminant function containing wavelength ratios of 515/675, 555/675, and 805/815 nm. There were 18 observations per species. Note that 17% of observations from wheat were classified into ryegrass.

 

Figure 5
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  		Fig. 5. Discrimination of cheat (ch), ryegrass (ry), and wheat (wh) at Feekes 5 wheat growth stage with the discriminant function for the 755-nm wavelength and wavelength ratio of 855/675 nm. There were 18 observations per species.

 




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