... chlorophyll, an important indicator of plant health.The SPAD-502Plus performs quick measurements of the chlorophyll content of ... in the field.IntroductionNon-destructive measurement of plant chlorophyllThe SPAD-502Plus enables quick, easy measurement of the chlorophyll ... wheat, rice, corn, cotton, etc.Nitrogen fertilization optimizationThe SPAD-502Plus can be used for determining when and how much ...