I will have more on this later once I actually get data. 

For the most part, additional spectra will not add a whole lot of additional information.  The standard visible wavelength camera, if properly normalized to standardized reflectors - will likely contain most of that data needed for agronomic analysis.   I state this because there will be a lot of folsk trying to sell you camera over the next few years. 

For the most part, we just need better standard reflectors and batter post processing.