Skip to main content

Advertisement

Table 1 Model performance for the 13 forage attributes based on full spectrum

From: Predicting the quality of ryegrass using hyperspectral imaging

Variable HSI # LV PLSR Calibration Validation
R2 RMSE # images Min. Max. Mean SD R2 RMSE # images Min. Max. Mean SD
LMW (mg/g) BL + PS 8 0.54 13.90 131 22.3 127.4 53.9 20.4 0.26 17.60 64 23.0 121.3 54.1 20.3
HMW (mg/g) BL + PS 12 0.68 19.90 129 2.4 167.5 36.2 35.1 0.63 21.60 66 3.1 144.1 37.1 35.0
Sugars (mg/g) BL + PS 12 0.70 28.90 129 26.7 252.8 90.0 52.2 0.58 34.40 66 27.1 244.5 91.5 52.8
Visual yield (%) BL + PS 4 0.43 2.85 25 11.4 26.5 19.9 3.7 0.12 3.24 12 14.6 25.9 20.3 3.3
NDF (%) BL + PS 11 0.38 2.53 123 38.7 53.1 45.9 3.2 0.19 2.98 62 38.7 53.8 45.9 3.3
ADF (%) BL + PS 16 0.59 1.39 123 21.1 30.2 25.7 2.2 0.36 1.68 62 21.6 30.2 25.9 2.1
Nitrogen (%) BL + PS 20 0.86 0.25 127 0.4 4.65 3.2 0.7 0.70 0.35 64 1.6 4.72 3.21 0.6
DOMD (% DM) BL + PS 9 0.43 1.36 120 60.0 69.4 65.2 1.8 0.25 1.50 61 61.2 69.2 65.3 1.7
ME (MJ/kg DM) BL + PS 9 0.43 0.22 120 9.6 11.1 10.4 0.3 0.25 0.24 61 9.8 11.1 10.4 0.3
DM (%) BL + PS 13 0.45 0.52 124 92.9 96.4 94.5 0.7 0.13 0.64 63 93.0 96.2 94.5 0.7
Ash (%) BL + PS 21 0.70 0.66 125 5.7 12.6 9.8 1.2 0.50 0.80 62 6.5 12.2 9.9 1.1
Ca (mg/g) BL + PS 6 0.18 0.97 127 1.6 7.9 4.3 1.1 0.17 0.91 60 2.5 7.2 4.3 1.0
OM (%) BL + PS 12 0.62 0.91 125 80.7 89.5 84.6 1.5 0.43 1.04 62 81.2 88.4 84.6 1.4
LMW (mg/g) BL 8 0.51 13.60 121 22.7 127.4 51.9 19.3 0.26 17.40 59 23.1 121.3 52.5 20.0
HMW (mg/g) BL 13 0.73 16.90 121 2.4 167.5 32.8 32.5 0.71 18.50 59 3.1 136.2 34.5 33.8
Sugars (mg/g) BL 12 0.71 27.00 119 26.7 252.8 85.5 50.1 0.54 32.80 61 27.1 244.5 85.1 47.8
Visual yield (%) BL 4 0.42 2.86 25 11.4 26.5 19.9 3.7 0.05 3.35 12 14.6 25.9 20.3 3.3
NDF (%) BL 10 0.35 2.56 116 38.7 53.1 45.7 3.2 0.14 3.01 54 38.7 53.8 45.5 3.2
ADF (%) BL 8 0.34 1.78 113 21.1 30.2 25.6 2.2 0.41 1.61 57 21.6 30.2 25.8 2.1
Nitrogen (%) BL 9 0.61 0.34 115 1.9 4.6 3.3 0.5 0.52 0.39 61 2.1 4.7 3.3 0.6
DOMD (% DM) BL 9 0.47 1.27 112 60.6 69.4 65.3 1.7 0.33 1.44 54 61.2 69.2 65.3 1.7
ME (MJ/kg DM) BL 9 0.47 0.20 112 9.7 11.1 10.4 0.3 0.33 0.23 54 9.8 11.1 10.4 0.3
DM (%) BL 9 0.33 0.58 113 92.9 96.4 94.5 0.7 0.11 0.63 59 93.0 96.2 94.5 0.7
Ash (%) BL 21 0.87 0.43 116 5.7 12.6 9.9 1.2 0.55 0.77 56 6.5 12.2 9.9 1.1
Ca (mg/g) BL 5 0.18 0.96 117 1.6 7.9 4.4 1.0 0.08 0.93 55 3.0 7.2 4.4 0.9
OM (%) BL 15 0.72 0.80 113 80.7 89.5 84.6 1.5 0.50 0.98 59 81.2 88.4 84.6 1.4
  1. Models are based on the mean reflectance HSI spectra analysed by PLSR model (Blades (BL) + pseudostems (PS) and blades (BL) only; Standard Normal Variate (SNV) preprocessing