Dosing K2SO4 for Increased Potassium

Why Yes, Yes Indeed, I Have, Now That I Come To Think of It


Hi,


Potassium sulfate, K[SUB]2[/SUB]SO[SUB]4[/SUB] is a great way to get extra potassium, especially if you are using something other than Potassium nitrate for Nitrogen.


Potassium is 44.8736 % of Potassium sulfate, so each teaspoon (~6.4-grams) will add about 7.59-ppm of potassium to each 100-gallons.


Biollante

 

Forgot to Cheat


Hi,

Oops, forgot I said I was going to steal, er, ah, well, base my answer on Wet’s amazing calculator, http://calc.petalphile.com/.


Could not figure out how to get where I wanted so I entered the numbers that I knew and here is the screen capture.





Biollante

 

See Biollante Wet says 6.403g you said only 6.4g with a stupid squiggle.

Iam ordering the 1150lbs of 10% DPTA iron for my 500-ml of 1% solution

 

Out of interest, why? What are you using for your N and P ?

 

There is an idea to dose a bit higher K than N, in order to let plant use that excess K to burn N from fish waste.
If you like the idea. So adding K from K2SO4 (or KCl) is sound.

 

No Matter How Good the Lawyer You Cannot Beat the Laws of Physics,er Chemistry

Hi,

Yes, 0.64-gram per 10-gallons will raise the K[SUB][SUP]2+[/SUP] [/SUB]about 7.6-ppm.

If you wish 500-ml solution that contains 0.64 grams⁄ml of K2SO4, you multiply 0.64 grams⁄ml K2SO4 X 500-ml that equals 320g K2SO4.

• That means you would need to mix 320 grams of Potassium sulfate into 280-ml of distilled water that
• my friend, is not happening. :gw
• Since my outdated (but not that outdated) 86th Edition of the Handbook of Chemistry and Physics says that the best we can do at sea level, at 25C is get
• 120 grams K2SO4 per liter of solution with distilled water.

Time for plan “B” :gw
Instead of 1-ml raising the K2+ 7.6-ppm per 10-gallons, add 1-ml per gallon. Since we know 320-grams would get us 1-ml per 10-gallons and since [SUP]320-grams K2SO4 [/SUP]⁄[SUB]10[/SUB] is 32-grams.

Into 450-ml of distilled water add 32-grams K2SO4 mix thoroughly add enough distilled water to make 500-ml (~18-ml).

Biollante

 

What Do You Want?


Hi,

What are targeting or trying to accomplish? It is unclear to me.

In the above each ml will raise the K[SUP]2+[/SUP] in 1-gallon about 7.6-ppm.

If you are targeting an additional 15-ppm in 50-gallons of water then I would add 30-ml three times a week.
A purist would add 33-ml 3 X week.

Biollante

 

Stuff, Stuff & More Stuff On Average---Occupy Something Against Greed & Stuff

Hi,



Then I would say the If you are targeting an additional 15-ppm in 50-gallons of water then I would add 30-ml three times a week ([SUP]4.6-ppm K2+[/SUP]⁄[SUB]dose[/SUB], [SUP]13.82-ppm K2+[/SUP]⁄[SUB]week[/SUB]), 33-ml 3 X week ([SUP]5.01-ppm K2+[/SUP]⁄[SUB]dose[/SUB], [SUP]15.2-ppm K2+[/SUP]⁄[SUB]week[/SUB]).



Based on Wet’s nifty, really spiffy, “the accumulation of fertilizers vs time and plant uptake” you end up with this (based on 5-ppm, 3 X week).




Note that if you have high uptake, at least as defined by Wet (for the record, I think it is quite accurate) you will need to dose around 15-ppm per week to maintain 6-8-ppm daily.


Biollante

 

We'll continue tomorrow — if I live.--Paul Erdos

Hi,

You are most welcome!

Paul Erdos is one of my favorites...

• It is not enough to be in the right place at the right time. You should also have an open mind at the right time.
  • My Brain Is Open : The Mathematical Journeys of Paul Erdos
    

Biollante