Combined Spectral Index to Improve Ground‐Based Estimates of Nitrogen Status in Dryland Wheat

By J. Eitel, D. Long, Paul E. Gessler, E. Hunt. 2008

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Green leaf area index estimation in maize and soybean: Combining vegetation indices to achieve maximal sensitivity (2012, background): “The goal of these studies, however, was to remove the effect of LAI on the estimation of leaf chlorophyll content (Daughtry et al., 2000; Haboudane et al., 2002; Eitel et al., 2008, 2009); therefore, for this paper, that particular set of VIs was not considered for estimating gLAI.”
A visible band index for remote sensing leaf chlorophyll content at the canopy scale (2013, methodology): “(2004) Combined index with MCARI Vis–RE–NIR MCARI/MTVI2 Eitel et al. (2007, 2008) Triangular greenness index Vis TGI −0.5[( r − b)(Rr − Rg) − ( r − g)(Rr − Rb)] Hunt et al. (2011)”
Water and Nitrogen Effects on Active Canopy Sensor Vegetation Indices (2011, methodology): “Previous work by Eitel et al. (2008) investigated the impact of water availability and N stress on leaf area index (LAI) in wheat using a multispectral radiometer and a chlorophyll meter.”