converting ppm to npk % ?
- Thread starter ..macy..
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Sativied
Well-Known Member
Hey mainliner, depends on how much you would use and in how much water you would put that in.
Are you sure it wasn't the other way around, npk to ppm? PPM meters are TDS meters, Total Dissolved Solids. Going back from that "total" to the ratio, requires you to know how much of that total is N, P, and K, which is undoable without measuring the NPK separately using for example a photometer.
..macy..
Member
no i meant ppm to npk , if iv got a bottle of N and i add it to 10 gallons of water , what will my ppm read if lets say i want 13-0-0
..macy..
Member
No it was npk to ppm . I think this is what i meant
http://www.mjguide.com/tutorials/Conversions/1572.htm
http://www.mjguide.com/tutorials/Conversions/1572.htm
Sativied
Well-Known Member
In your example the known value is the N of the NPK and you want to know what the "ppm reading" will be. So yes, like I thought, npk to ppm.
Here you go:
http://www.manicbotanix.com/calculators/ppm-in-solution-calc.php
Here you go:
http://www.manicbotanix.com/calculators/ppm-in-solution-calc.php
..macy..
Member
again where's my 'really fuckin likes' button.
just what im after.
i get a strange feeling i used to hate you ?
why?....... I don't know
Sativied
Well-Known Member
Maybe I knew you in a previous lifeagain where's my 'really fuckin likes' button.
just what im after.
i get a strange feeling i used to hate you ?
why?....... I don't know
..macy..
Member
polo the don
Well-Known Member
Why in the hell would a person want a 20-0-0 ratio, mainy?
..macy..
Member
to feed the plants extra N ?
polo the don
Well-Known Member
Why not feed them the proper amount of N along with everything else they need!?
I can't believe I'm biting on this.....
..macy..
Member
im not with you ? Your making it complicated for yourself
polo the don
Well-Known Member
im not with you ? Your making it complicated for yourself
Never mind
..macy..
Member
seriously , is that it , only weak people say " never mind"
churchhaze
Well-Known Member
ppm is mg/L. It's a measurement of mass concentration.
If you want to convert mg/L to percent by mass, you need to know the density of the nutrient solution.
1) Find the mass of 1L of nutrient solution
2) If you have 100ppm of N, that's 100mg of N in a liter
100mg / (mass of 1 liter) = %N by mass.
Keep in mind that the ppm reading on your TDS meter is only an approximation based on EC. If you put 100mg of N in a liter bottle and fill the rest with distilled water, it's actually 100ppm N for real, not an approximation.
If you want to convert mg/L to percent by mass, you need to know the density of the nutrient solution.
1) Find the mass of 1L of nutrient solution
2) If you have 100ppm of N, that's 100mg of N in a liter
100mg / (mass of 1 liter) = %N by mass.
Keep in mind that the ppm reading on your TDS meter is only an approximation based on EC. If you put 100mg of N in a liter bottle and fill the rest with distilled water, it's actually 100ppm N for real, not an approximation.
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