The present study was the determination the correlation between values of two
chlorophyll meters: SPAD-502 and N-tester, indulging in comparison scientific results with these
two different devices. To this purpose, the six kinds of cereals in stage of heading were examined
on “index of greenest”: oat, barley Rataj and Nagrad, triticale, wheat and rye. Statistical analysis
carried out afterwards demonstrated that, between measurements received from two chlorophyll
meter founded high efficiency of linear regression. To recount values between the chlorophyll
meters can be use equation: (N-tester reading) = 14.5·(SPAD reading) – 73.4.