XQPQuepos, Costa Rica (Airport Code)
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With the use of fluorescence parameters in both dark and light-adapted leaves, the following calculations were made using symbolic formulas designated as (1) the maximum quantum efficiency of PSII - Fv/Fm = (Fm - F0) /Fm, (2) the coefficient of photochemical quenching-qP = (Fm - Fs)/ (Fm'- F0'), (3) non-photochemical quenching of the singlet excited state of chlorophyll a- NPQ= Fm/Fm'- 1, (4) the actual efficiency of PSII- PhiPSII= Fv'/Fm' xqP.