For those of us using S/H,
I have heard recommendations to fertilize at 100 to 150 ppm N.
I could understand if one were using 1tsp/gal of 30-30-30,
that cutting fertilizer amount by a 1/3 to 1/4 would get results in that range.
But if someone were using 1sp/gal of 10-10-10,
and cut by a quarter amt, that person would be getting less than 50 ppm N.
Although if one were using 1 Tbl/gal of 10-10-10,
then only using 1/3 Tbl/gal would get that person at the 150 ppm N range.
I know it's a lot of numbers and fractions,
but the question I ask is
since in SH fertilizer is constantly available to the plant,
and 100-150 ppm N is a recommended goal,
then perhaps less frequent fertilizing would require a higher ppm N?
The scientist in me takes all orchid "tips & tricks" with a grain of salt,
and so instead of just following what my fertilizer label says,
(or arbitrarily cutting the amount in half)
I arbitrarily have a 125 ppm N goal in mind,
and adjust the fertilizer amount per gal to acheive that goal.
I don't grow disas,
or other sensitive plants, so I'm guessing YMMV when it comes to ppm N for those guys.