Thank you Ray,
I agree at least N should be a bit higher.
But again keeping TDS in check, (opinions about what TDS should be very a great deal though) having nutrients in a reasonable amount and keep al the lifeforms involved happy is quite difficult.
for example, 25ppm N translates in 110.75 ppm NO3. For aquarium fish levels above 30 ppm NO3 are not recommended. Most fertilizers use ammonium nitrate (NH4NO3) but ammonium(and nitrite) will be lethal at only a few ppm. So nitrate fertilizers like calcium/potassium/magnesium nitrate are the only options.
Based on your comment I read some research on rainwater chemistry in rain forests. A few interesting finds:
cloud water contains much more dissolved ions then rainwater. because there is less water in there. the mean conductivity of cloud water in Puerto Rico was 74,2 uS/cm. Rain water in the same location 29.8.
source
In the western amazon forest in Brazil, mean NO3 in rainwater varied between 5 and 30 umol/l or 0,31 -1,86 mg/l NO3 or 0,07 -0,42 ppm N.
Source
in rainwater in Puerto Rico total N was more or less similar, in cloudwater the mean total N was much higher; 0,96 ppm N. Still not much but significantly higher.
variations in many nutrients are huge though so maybe it is not so critical anyway.
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