chlorosis

I am pretty sure some of my plants /trees are exhibiting chlorosis. The new leaves are yellow.  Plants affected are  Persea americana, Euphorbia pulcherrima (quite young), Tecomaria capensis,  Acacia baileyana ?Purpurea? (new) Strelitzia reginae, (quite young) Some old Hibiscus rosa-sinensis look a bit yellow too.
I have mature versions of all the young affected plants and they do not appear to have the same problems.  I have put chelated iron in the soil around them but there is no improvement.  Has anyone success in dealing with chlorosis? Or what else could it be? We have had quite a lot of rain and the ground is very damp. 
 
 
Pamela
 
Costa Blanca

E  0°  N  38 °

 
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