What's the Limiting Factor?
With yield mapping and NDVI imagery so widely available now it’s not difficult for us as agronomists or farmers to recognize there is yield variability in fields. The difficult question is why? Are some areas too dry? Too wet? Saline? P limited? Excess N causing lodging? Sodic soils?... the list is almost endless. There are also temporal factors that affect yield, such as weed patches, gophers, cutworms, etc. But if we are going to focus on variable rate nutrients or ame