Quote:
Originally Posted by empresarios
Hello Luches. Thank you very much for the valuable information.
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You welcome empresarios! (I believe I have missed this post)
First of all, components cannot be seen as 99.9% pure lab grade chemicals but they actually are of so called fertilizer grade quality. The content of elements may vary slightly or sometimes widely. The important thing here is: know your base material and adopt the maths to them.
Example:
Quote:
Originally Posted by empresarios
N: 2*14.01*666/236.17 [Ca(NO3)2*4H2O] + 14.01*331/101.1 [KNO3]
= 124.88 ppm vs. 150 ppm you calculated
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The calcium nitrate mostly in use contains 14.3 Nitrate N AND 1.3 ammoniacal N = total N
15.6
And around 25-30 more ppm of Calcium is provide by CaCl (at least in my formula)!
Quote:
Originally Posted by empresarios
P: 30.97*250/136.09 [KH2PO4]
= 56.89 ppm vs. 57 ppm you calculated
K: 39.1*331/101.1 [KNO3] + 39.1*250/136.09 [KH2PO4]
= 199.84 ppm vs 200 ppm you calculated
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Identical I guess, except that I obviously have rounded up the ppm
Quote:
Originally Posted by empresarios
Ca: 40.078*94/219.08 [CaCl2*6H2O]
= 17.19 ppm vs 15 ppm you calculated
Cl: 2*35.453*94/219.08 [CaCl2*6H2O]
= 30.42 ppm vs 60 ppm you calculated
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As for calcium chloride, there are truly many grades, ranging from only 75% purity to almost 99%. Use the percentage and purity of each individual product you use. But then again I may be prone to error as well. I could have simply been wrong with this-one. Let me check that again when I have time. But in case the Cl part is only as half as much (as I have calculated), that's good news as you could complement even more Ca through CaCl, without worrying about Cl toxicity.
As for now, either way it's not an issue as only minimal quantities are required and it's actually better to have only 30 ppm of Cl than 60. An error of that range with that quantity isn't actually modifying the formula - here it actually improves it!
I guess that explains it. Your maths are all right, but we have got different base products in some case(s).
PS: as for the savings, Wade, it is a HUGE difference once you are break even with your equipment!