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where can u find potassium nitrate from fertilizer ? Answered

in what type of fertilizer can u find potassium nitrate

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There is a Wikipedia article that explains NPK numbers.

https://en.wikipedia.org/wiki/Labeling_of_fertiliz...

I am speculating here, but there might exist places in the world where you can just buy fertilizer grade potassium nitrate (KNO3), like in 40 pound bags, or whatever.

If it's out there, pure KNO3 fertilizer should have a NPK number of,

13-00-44

That's according to the Wiki article linked above. I have not done the math myself.

I decided to do the math, but the answer I got for the NPK rating, for pure KNO3, is closer to 14-00-47.

I did the math with an Octave script. So I can attach that here, and share it with the rest of the class.

If anyone can see what I did wrong, please let me know.

%npkforkno3
%
%This script calculates the NPK numbers for pure KNO3
%The prefix "mm_" means "molecular mass"
%The prefix "mf_" means "mass fraction"

mm_K=39.0983
mm_N=14.0067
mm_O=15.9994

mm_KNO3 = [1,1,3]*[mm_K, mm_N, mm_O]'
mm_K2O = [2,1]*[mm_K, mm_O]'
mm_K2 = 2*mm_K
mf_K = mm_K/mm_KNO3
mf_N = mm_N/mm_KNO3
mf_O = mm_O/mm_KNO3

K2O_factor=mm_K2O/mm_K2

finalN = 100*mf_N
finalP = 0
finalK = 100*mf_K*K2O_factor

and here's the output from that script

mm_K = 39.098
mm_N = 14.007
mm_O = 15.999
mm_KNO3 = 101.10
mm_K2O = 94.196
mm_K2 = 78.197
mf_K = 0.38672
mf_N = 0.13854
mf_O = 0.15825
K2O_factor = 1.2046
finalN = 13.854
finalP = 0
finalK = 46.584

look at it this way, several answers suggest this isn,t such , good idea. No matter if you want to hear that.

I guess if it was legal or a good idea you would know how to find this material locally (which I would also point out we don,t know).