Fe3+concentration was kept near to an optimal level for spinach culture by adding iron chelate
as mentioned above, the K+ concentration was within the range reported by Villarroel et al.
(2011) that registered K+ values between 9.52 and 15.9 mg/l in an integrated aquaponic
system with Nile tilapia (Oreochromis niloticus) and strawberry. The alkalinity registered
values that are situated within the range mentioned by Sikawa et al. (2010), which reported
values of alkalinity between 99-469 mg/l for a hydroponic production of lettuce (Lactuca
sativa) by using hybrid catfish (Clarias macrocephalus×C. gariepinus) pond water.
Tab.