Nutrient deficiencies

[calvin_orchidL]

Hi everyone
Just curious whether or not anyone has experience with the different symptoms seen as a result of nutrient deficiency in orchids. I know it's quite rare, and many symptoms are shared amongst lots of things

I stumbled upon an article that seems to do some of these studies, and they mention that orchids typically respond slowly to deficiencies, mainly because they are highly efficient at mobilizing nutrients from other/older parts of the plant (in other words, self cannibalism!) However, they don't list observable symptoms

I water with RO water which is quite pure. From basic chemistry, it seems that not only is this water missing some basic nutrients, but it could also be leaching out nutrients from the media. I was using MSU's RO water fertilizer, but a few months ago I spilled some water into the fertilizer bottle and everything ended up clumping together, so I had to chuck the whole thing out. As a result, I haven't been fertilizing for a while, and I'm starting to notice some funny things happen with my plants.