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K2so4/mgso4

Discussion in 'General Plant Topics' started by oxburg, Dec 26, 2010.

  1. oxburg

    oxburg Junior Poster

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    Can I skip K2SO4 instead using MGSO4 only?I found out i can easily overdose K with KNO3 + K2HPO4.So possible to supply suplhur with MGSO4? Will i overdose Mg if i just use MGSO4 for supply.Thanks
     
  2. ibanezfrelon

    ibanezfrelon Guru Class Expert

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    Hallo! I'm just curious , how much K is overdose? I would say that by the time you overdose K with KNO3 you would already be overdosing NO3 heavily...
     
  3. Biollante

    Biollante Lifetime Charter Member
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    A Lot of Potassium To Be Toxic; Me Thinks

    Hi,

    Agreed you really do not need a lot of potassium, not sure any great need for sulfate though. :confused:

    We usually do not need multiple 'K' sources... :)

    The Epsom salt raises general hardness and is generally dosed in conjunction with Calcium, something like 3 or 4 parts Calcium to 1 part Magnesium. I would be concerned about over doing the Epsom salts.

    Not sure I helped... :eek:

    Biollante
     
  4. Tug

    Tug Lifetime Charter Member
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    Yea

    the amounts of K+ from KNO3 and KH2PO4 can be non-limiting, but (I don't recall the actual study) an amount that would be called an overdose is a very, very different thing.
    K+ availability is often limited under high fish-loads.
    :) potassium is a very useful nutrient. Not something to leave out, IMO.
    One reason to dose KNO3 and KH2PO4, you get all three (NPK).
    And dosing K2SO4, it depends but there are times when it's a good idea. But sure, add Ca/Mg if they're low.​

    K+ Overdose, not likely.
    non-limiting amounts, 10-15ppm.

    :confused: Overdose, over 120ppm? More?


    How much is enough;
    Even more about K+.
     
    #4 Tug, Dec 26, 2010
    Last edited by a moderator: Dec 27, 2010
  5. Biollante

    Biollante Lifetime Charter Member
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    That Tug Is So Dang Smart

    Hi,

    I agree with Tug. :eek:

    I guess I was trying to say I was more concerned with too much Magnesium than too much Potassium... :gw

    I tend to think non-limiting Potassium is closer to 20-ppm, but then I am a Nutrient Type. :cool:

    But, frankly confused by the desire for sulfate... :confused:

    Biollante
     
  6. Jim Miller

    Jim Miller Lifetime Charter Member
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    K2SO4 is just a way of adding a pair of K+ without increasing nitrates or phosphates if those were a concern.

    jim
     
  7. oxburg

    oxburg Junior Poster

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    Cause currently i dosing KNO3 , MGSO4 and K2HPO4 ( is Di potassium ).
    So after i calculated I got more K from K2HPO4.While the SO4 I could get from MGSO4 so do I still need the K2SO4?
    Is it sufficient SO4 just from MGSO4?

    Oxburg
     
  8. Tug

    Tug Lifetime Charter Member
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    What are you not telling us?

    Plants with high nitrogen requirements must have adequate sulfur and potassium to optimize nitrogen use. The good news is K+ would never cause toxicity issues at those levels or any levels we would be dosing. More often, it is high levels of SO4 that cause some consternation.

    I mean sulfur deficiency is possible, but rare. Your tap water would have to be extremely soft. Even then, if you have soft water, adding CaSO4 and MgSO4 adds SO4, keeping levels were there needed. Otherwise, most tap water has plenty sulfate. My tap water has about 50ppm.

    If you need added K+ (please use the links to Tom's OP on post #4),
    then add K+ to your dose.

    If you're low in Mg, add MgSO4.
    • What makes you think you need to add Mg?
    Low levels of SO4 would be very rare.
    • So, yes. You should get sufficient SO4 just from MgSO4.
     
    #8 Tug, Dec 27, 2010
    Last edited by a moderator: Dec 27, 2010
  9. Biollante

    Biollante Lifetime Charter Member
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    What Are You Seeing?

    Hi Oxburg,

    I have never heard of Potassium overdose in plants or fish, I cannot find any information anywhere on Potassium toxicity in aquatic critters.

    Back in the olden days in the last millennium (a thousand years ago?) we dosed Potassium two or three times to Nitrates, well, because we didn't know any better... and because Potassium is cheap and really didn't hurt anything even if (though?) it didn't do any good. :gw

    So I am with that smart fellow Tug, wondering what you are seeing that is causing you concern.

    Biollante
     
    #9 Biollante, Dec 27, 2010
    Last edited by a moderator: Dec 27, 2010
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