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Estimation of Forage Production of Nilegrass Using Vegetation Reflectance

^a Crop Science Division, Taiwan Agricultural Research Institute, Wufeng, Taichung Hsien 41301, Taiwan ROC
^b Forage Crops Division, Taiwan Livestock Research Institute, Hsinhua, Tainan Hsien 71246, Taiwan ROC. This work was supported by the research grants (92AS-8.1.1-CI-C1, 93AS-8.1.1-CI- C1, and 94AS-8.2.1.-CI-C1) from Council of Agriculture, Executive Yuan, Taiwan ROC

View larger version (16K): [in this window] [in a new window]   Figure 1. Trends in linear correlation coefficients between spectral reflectance in the range of 350 to 2400 nm and forage production of nilegrass (Acroceras macrum Stapf).

View larger version (18K): [in this window] [in a new window]   Figure 2. The quadratic relationship between forage fresh weight and spectral reflectance at 891 nm of vegetation spectra of nilegrass (Acroceras macrum Stapf).

View larger version (21K): [in this window] [in a new window]   Figure 3. The quadratic relationships between forage fresh weight and spectral indices (normalized difference vegetation index [NDVI] and RGREEN/RNIR ratio) calculated from vegetation spectra of nilegrass (Acroceras macrum Stapf).

View larger version (15K): [in this window] [in a new window]   Figure 4. Comparisons between the predicted values of forage fresh weight from the multiple linear regression model and the measured values of forage fresh weight of nilegrass (Acroceras macrum Stapf).