Just to clarify, if the grower does not leave an N rich strip to compare to the NDVI readings throughout the field then is there any real value for the handheld? I'm a crop consultant and was considering buying one. My thought was to use it to get average field readings and hopefully use that to make recs for sidedress N amounts. The more I read though, seems like you need an N rich strip to compare it to. Or are there "standard" values for each crop to compare readings to?