Prediction of Canola Residue Characteristics Using Near-Infrared Spectroscopy

Table 1

Calibration statistics for prediction of NDF, ADF, ADL, N, C, and C/N in 2011 and 2012 winter and spring canola residue using NIRS. Residue consisted of stems, litter (small stems, leaves, and pods), and roots.

(a) 2011 winter and spring canola residue

Component	Math			SD	SEC		SECV		SD/SECV
NDF	2, 10, 10, 1	297	71.57	10.21	2.10	0.96	2.24	0.95	4.56
ADF	2, 10, 10, 1	299	55.90	8.95	1.42	0.98	1.61	0.97	5.55
ADL	2, 10, 10, 1	304	13.12	2.39	0.75	0.90	0.83	0.88	2.72
N	2, 10, 10, 1	305	0.80	0.49	0.08	0.98	0.09	0.97	5.41
C	2, 4, 4, 1	299	43.80	2.99	0.61	0.96	0.74	0.94	4.05
C/N	2, 4, 4, 1	301	73.12	36.82	8.08	0.95	9.93	0.93	3.71

(b) 2012 winter and spring canola residue

Component	Math			SD	SEC		SECV		SD/SECV
NDF	2, 4, 4, 1	205	73.20	7.08	1.29	0.97	1.59	0.95	4.44
ADF	2, 4, 4, 1	206	59.02	5.96	1.19	0.96	1.40	0.94	4.25
ADL	2, 10, 10, 1	205	13.34	2.01	0.75	0.86	0.83	0.83	2.41
N	3, 5, 5, 1	209	0.815	0.51	0.06	0.99	0.09	0.97	5.41
C	1, 4, 4, 1	207	42.34	2.09	0.62	0.91	0.69	0.89	3.03
C/N	2, 10, 10, 1	207	73.12	45.39	10.88	0.94	12.99	0.92	3.49

NDF: neutral detergent fiber; ADF: acid detergent fiber; ADL: acid detergent lignin; N: nitrogen; C: carbon; C/N: carbon to nitrogen ratio; NIRS: near-infrared spectroscopy; SD: standard deviation; SEC: standard error of calibration; : coefficient of determination; SECV: standard error of cross validation; : 1 minus variance ratio.
scatter correction SNV and detrend was used. Math treatment: derivative number, gap (nm), smooth (number of smoothing points), and second smooth.
percent NDF, ADF, ADL, C, and N.