Quote:
Originally Posted by guccisimo85
Does anyone have a resource that covers what ppm to give different kinds of orchids?
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With enough searching, you’ll certainly find people telling you
what they give their plants, but that doesn’t mean they’re right or that you should do the same.
Part of the problem is that we don’t really have any idea
how much of the applied fertilizer is actually absorbed by the plant. A bare-root vanda only gets what’s absorbed by the velamen the instant it is fed. A cattleya in coarse bark may have a bit more time to absorb, but not much compared to a phalaenopsis in sphagnum. If fed identically, in this scenario the phal would bet the most food while the vanda got the least, which in my experience, is the opposite of what it should be.
The closest related “fact” is that for a plant to gain about 500 g in mass, it must consume about 100 kg of water, but only 5 g of NPK fertilizer.
There is just so much unknown in this field, I have boiled it down to a general recommendation of plants getting 100 ppm N per week (+/-), whether that’s a 100 ppm N solution applied weekly, or 25 ppm N applied every other day.
Note that’s nitrogen concentration, not TDS. There is
too much wrong with sharing TDS info.
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