Table 9 Vegetation indices for nutrients and chlorophyll
From: Soybean cyst nematode detection and management: a review
Vegetation Index | Equation | Applications | Range (nm)/Type |
|---|---|---|---|
Nutrient Management Indexes | |||
Soil Adjusted Vegetation Index (SAVI) [80] | \(\frac{(R_{NIR} - R_{Red})(1+L)}{R_{NIR} + R_{Red} +L}\) | Nitrogen Application, Crop Yield, Disease, Biomass, Water Stress | 630-900/UAV |
Water Balance Index (WABI) [81] | \(\frac{R_{1500} - R_{531}}{R_{1500}+R_{531}}\) | Irrigation Scheduling | 531 -1500/ Manual Mount-based |
Transformed Soil Adjusted Vegetation Index (TSAVI) [82] | \(\frac{a(R_{NIR} - aR_{Red} - b)}{R_{Red} + aR_{NIR} - ab}\) | Water Stress, Crop Yield | 630-900/Manual Mount-based, UAV |
Optimized Soil Adjusted Vegetation Index (OSAVI) | \(\frac{1.16(R_{NIR} - R_{Red})}{R_{NIR} + R_{Red} + 0.16}\) | Crop Yield, Biomass, Nitrogen Management, Soil Moisture, Water Stress | 630-900/N.A. |
Photochemical Reflectance Index (PRI) [83] | \(\frac{R_{531} - R_{570}}{R_{531} + R_{570}}\) | Disease, Crop Yield, Leaf Water Stress, Canopy Temperature, Water Stress | 531-570/Manual Ground-based |
Shortwave Infrared Water Stress Index (SIWSI) [84] | \(\frac{R_{858.5} - R_{1640}}{R_{858.5} + R_{1640}}\) | Leaf Water Content | 858.5-1640/Satellite (MODIS) |
Degrees Above Non-stressed Canopy (DANS) [85] | \(min(0, T_{stressed} - T_{non-stressed})\) | Water Stress | 700-1000/ (IR Radiation)/Ground-based |
Degrees Above Canopy Threshold (DACT) [86] | \(max(0, T_{measured} - T_{ref})\) | Water Stress | 700-1000/ (IR Radiation)/Ground-based |
Normalized Difference Water Index (NDWI) [87] | \(\frac{R_{Green} - R_{NIR}}{R_{Green} + R_{NIR}}\) | Soil Moisture and Yield | 550-900/Satellite (ETM+, SPOT, ASTER, MODIS) |
Chlorophyll Related Indexes | |||
Green Chlorophyll Index (GCI) [88] | \(\frac{R_{NIR}}{R_{Green}} -1\) | Chlorophyll Content | 550-900/Manual Mount-based |
Normalized Pigment Chlorophyll Index (NPCI) [89] | \(\frac{R_{680} - R_{430}}{R_{680} + R_{430}}\) | Water Stress through Chlorophyll Content | 430-680/Satellite (AVHRR) |
Chlorophyll Absorption Ratio Index (CARI) [90] | \(\frac{R_{700}}{R_{670}} \times \frac{aR_{670} + bR_{670}}{\sqrt{a^{2}+1}}\) | Chlorophyll Content | 670-700/Satellite (Hyperion/EO-1) |
Chlorophyll Vegetation Index (CVI) [90] | \(\frac{R_{NIR}}{R_{Green}} \times \frac{R_{Red}}{R_{Green}}\) | Crop Yield, Crop Growth through Chlorophyll Content | 550-900/Ground-based |
Chlorophyll Index (CI) [91] | \(\frac{R_{NIR}}{(R_{RedEdge})} -1\) | Chlorophyll and Nitrogen Content | 700-900/Satellite (MERIS) |