Quantitative Determination of Germinability of Puccinia striiformis f. sp. tritici Urediospores Using Near Infrared Spectroscopy Technology

Table 1

Influence of different preprocessing methods of the near infrared spectra on prediction results of QPLS models for quantitative determination of germinability of Puccinia striiformis f. sp. tritici urediospores.

Preprocessing method	The number of principal components	Training set			Testing set
			SEC/%	AARD/%		SEP/%	AARD/%
No preprocessing	9	0.9895	0.02	5.32	0.8705	0.08	20.23
Centralization	4	0.7032	0.11	22.87	0.7498	0.11	16.76
Range normalization	9	0.9833	0.03	6.93	0.8686	0.08	20.06
Vector correction	8	0.9665	0.04	9.44	0.8961	0.07	17.31
Scatter correction	8	0.9592	0.04	10.71	0.8455	0.08	21.09
First derivative transform	4	0.8081	0.09	19.31	0.8616	0.08	19.41
Second derivative transform	5	0.7851	0.10	20.59	0.8758	0.08	14.34
Average	7	0.8850	0.06	13.40	0.8526	0.08	18.46