Mixing my own ferts

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born2killspam

Well-Known Member
They're the only good thing about living in this pussified world..:)

Google tip, use the filetype qualifier for *.pdf and *.doc.. If you don't know that one you'll love it.. eg
"Miracle Gro" msds filetype:pdf
"Miracle Gro" msds filetype:doc

Edit: smilies sometimes fuck shit up.. The second one is properly formatted..
 
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born2killspam

Well-Known Member
Oh pm me with an email address that can accept a 1.2MB pdf.. I've got a good one on the evolution of the chemical reactions of photosynthesis.. Most of it is pretty nutsy hardcore biochem, but still cool to cover and quite a bit of it will likely yield you some pretty useful info on light&plants&respiration.. Its a shame I can't attach it to the forum as an attachment..
 
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YourUsernameHere

Member
born2killspam said:
Oh pm me with an email address that can accept a 1.2MB pdf.. I've got a good one on the evolution of the chemical reactions of photosynthesis.. Most of it is pretty nutsy hardcore biochem, but still cool to cover and quite a bit of it will likely yield you some pretty useful info on light&plants&respiration.. Its a shame I can't attach it to the forum as an attachment..
Click to expand...
Ooh right, will do.
I think I've got some good formulas now, what do you think?
For veg:
3 parts KNO3
3 parts Urea
1 part triammonium orthophosphate
Which gets you an NPK of 30-7-20

Then for flowering, I'm thinking I might take the ammonium phosphate and heat it in the presence of potassium hydroxide, so ammonia gas (that pesky nitrogen xD) will be driven off, and I'll be left with some sort of potassium ammonium phosphate compound.
 
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born2killspam

Well-Known Member
I just woke up, from not enough sleep, and my mind isn't sharp, and I kinda need to relearn how to ride a bike, but I wouldn't expect any snafu's with that.. Have you done the math from the POV of ideal pH buffering, maybe dropping the TAP/salpeter in later vegitative cycle, getting your nitrate elsewhere, and looking at KOH/KH2PO4?? Phosphate buffers are DAMNED strong between pH 6-7.. If you get lucky, ratios/peak buffering capacity might just jive..
 
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YourUsernameHere

Member
born2killspam said:
I just woke up, from not enough sleep, and my mind isn't sharp, and I kinda need to relearn how to ride a bike, but I wouldn't expect any snafu's with that.. Have you done the math from the POV of ideal pH buffering, maybe dropping the TAP/salpeter in later vegitative cycle, getting your nitrate elsewhere, and looking at KOH/KH2PO4?? Phosphate buffers are DAMNED strong between pH 6-7.. If you get lucky, ratios/peak buffering capacity might just jive..
Click to expand...

Hmm, it turned out the shop I was buying from had no triammonium phosphate in stock... I might have to use monoammonium or monopotassium phoshpate instead...
I don't know much about pH buffering though, but if I could get a slightly acidic buffer solution, that'd be pretty awesome - no messing about with sulfuric acid pH correction.
 
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born2killspam

Well-Known Member
You can get DAP (the diammonium version) at any brew store as yeast energizer..
The reason phosphoric acid is the ideal pH is because it reacts to form these buffering compounds btw, it has nothing to do with the fact that it leaves available P in the mix.. (Well that is a plus too obviously, but...) Anybody who's tried knows pH adjustments with H3PO4 are much more stable than with acetic/citric acid, aluminum sulfate etc..
 
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