The pH of aquaponic solution had been alkaline (pH 7.7) in
the present study which decreases availability and uptake of Fe,
Mn, Zn and B (Bertoni et al., 1992; Roosta, 2011) and hence foliar
application of elements can meet the requirement of plants for
these elements. In field culture, foliar application of B increased
tomato shoot and root dry weight and improved fruit set and
total yields (Davis et al., 2003). Higher fruit number and yield
in foliar-treated plants in aquaponics compared to hydroponics