The two plants had alot of flower buds, two days after the first feed the buds that were the closest to blooming started falling, on both of them. Now various sizes of flower buds are continuing to fall, i recon that about 50% have fallen.
One mandarin thats full of buds and is about to flower theese days, does not have this problem.
The leaves do not show any fert burn signs, a friend also has a lemon and shte also said that after fertilizing her buds also started to shed......