How to handle fertilizer burn?

[KC Kam]

Hi All,

I have something that I need you all to help to clarify abit. Previously I've been using 21-21-21 fertilizer with 1/4 strength dilute in water and water directly. Everything seems fine for few months.

Until recently I got a new fertilizer known as orchid booster. I also use 1/4 strength and after 3-6 application over the span of 2 weeks some of my orchid root tips turn brown. I stop fertilizing and has been flushing with plain water for 2 days nw. It happen mostly on hanging root tips and those that dry up slower due to recent cooling days in my area where water evaporate slower.

I have a friend that uses the same fertilizer but he fertilize almost 1/3 of the strength yet nothing happen to his orchids. He did mentioned his place has strong wind and he only fertilize once a week. I believe his environment is more windy, that why he does not have such problem? Does the orchid really absorb more fert compare to mine 1/4 strength?

Does it mean that after flushing I should continue with 1/4 strength? or reduce the strength furthermore? When should I continue fertilizing?

Pls advice..