The plants were slightly greener in aquaponics compared with
hydroponics. In the control treatments, the chlorophyll index
in young leaves, determined as SPAD readings, was higher in
aquaponics as compared to hydroponics (Table 4). Foliar spraying
of Mg or Fe increased the SPAD value of young leaves in hydroponics
grown plants, while SPAD value of young leaves in aquaponics
grown plants was not affected by foliar application of any elements
(Table 4). There was no difference in maximal quantum yield of PSII
photochemistry (Fv/Fm) of young and old leaves of plants among
different treatments (Table 4).