Magnesium Deficiency

Discussion in 'General Marijuana Growing' started by shabba, May 4, 2008.

  1.  
    shabba

    shabba Active Member

    I have come to the conclusioin that my plants have a lack of magnesium as the leaves are starting to turn yellow! Just wondering what can I add to bring the magnesium level up? I'm growing in soil.
  2.  
    Picasso345

    Picasso345 Well-Known Member

    Magnesium (Mg)
    Magnesium is a component of the chlorophyll molecule and serves as a cofactor in most enzymes.
    Magnesium (Mg) deficiency:
    Magnesium deficiency will exhibit a yellowing (which may turn brown) and interveinal chlorosis beginning in the older leaves. The older leaves will be the first to develop interveinal chlorosis. Starting at leaf margin or tip and progressing inward between the veins. Notice how the veins remain somewhat green though as can be seen in figure 15.
    Notice how in figure 16 and 17 the leaves curl upwards like they're praying? They're praying for Mg! The tips may also twist.
    This can be quickly resolved by watering with 1 tablespoon Epsom salts/gallon of water. Until you can correct nutrient lockout, try foliar feeding. That way the plants get all the nitrogen and Mg they need. The plants can be foliar feed at ½ teaspoon/quart of Epsom salts (first powdered and dissolved in some hot water). When mixing up soil, use 2 teaspoon dolomite lime per gallon of soil.
    If the starting water is above 200 ppm, that is pretty hard water, that will lock out mg with all of the calcium in the water. Either add a 1/4 teaspoon per gallon of epsom salts or lime (both will effectively reduce the lockout or invest into a reverse osmosis water filter.
    Mg can get locked-up by too much Ca, Cl or ammonium nitrogen. Don't overdo Mg or you'll lock up other nutrients.

    Grow Marijuana FAQ, Cannabis cultivation - marijuana growing tips & photos

    Solution to fixing a Magnesium deficiency

    Any Chemical/Organic nutrients that have Magnesium in them will fix a Magnesium deficiency. (Only mixing at ½ strength when using chemical nutrients or it will cause nutrient burn!)
    Other nutrients that have magnesium in them are: Epsom salts, which is fast absorption. Dolomite lime and or garden lime (same thing just called different) which is slow absorption. Sulfate of Potash, Magnesia which is medium absorption. Worm Castings, which is slow absorption. Crabshell which is slow absorption. Earth Juice Mircoblast, which is fast acting. (a must buy!! Has lots of 2ndary nutrients).
    Now if you added to much chemical nutrients and or organics,( which is hard to burn your plants when using organics) You need to Flush the soil with plain water. You need to use 2 times as much water as the size of the pot, for example: If you have a 5 gallon pot and need to flush it, you need to use 10 gallons of water to rinse out the soil good enough to get rid of excessive nutrients.

    International Cannagraphic Magazine Forums - The Complete guide to Sick Plants,pH, and Pest troubles!
  3.  
    Grow4tho187

    Grow4tho187 Well-Known Member

    If that dint awnser ur question :) , i thought i had the same problem but actualy i was putting a littttle to much nutes stoped , the next day they dint turn 1% more yellow.
    that happend to me 2 days ago
  4.  
    cookin

    cookin New Member

    ^^^^ yeah same here, but i added epsom salts to my plant which apparently helps mg def but made mine worse as it was actually nute burn
  5.  
    boricuaboi

    boricuaboi Well-Known Member

    Use epsom salt, dolomite lime is basically calcium i use it in my homemade hydroponic soulution!
    Epsom salt is Magnesium sufate which contains mg and sulfurs!!!
  6.  
    shabba

    shabba Active Member

    It's def not nute burn as I'm not using them yet, they are only 3 weeks old & I'm gonna give it another week before I start with them. Can I just dilute all the above in to water? Also if I just left it as it is would it f*ck my plants completely?
  7.  
    LocoMonkey

    LocoMonkey Well-Known Member

    Shabba, do you have any pics. That would help diagnosis
  8.  
    shabba

    shabba Active Member

    I transplanted my plants about a week a go so this might have something to do with that. The leaves are started to yellow & I have read that the yellowing is due to magnesium definciancy.

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  9.  
    LocoMonkey

    LocoMonkey Well-Known Member

    How old are the plants? have you given them any nutrients?
  10.  
    shabba

    shabba Active Member

    They're 3 weeks old, I've just started with the nutes today. I transplanted them in to new soil about a week ago so I'm not sure if this has anything to do with it?
  11.  
    apasunee

    apasunee Well-Known Member

    How often do you water????? And your ph level is VERY important also and both of these issues can cause yellowing and a slow death...........:peace:......
  12.  
    hydrotech364

    hydrotech364 Evil Genius/Mod

    everyone has there own way and rules about nutes.i start my seeds in a mild nutrient solution and keep them on rotations of nutrients and water from the 1st day,never had any problem.my strains are big bud and northern papaya at three weeks i have a female with visible trich's on her leaves and one leaf in a bowl will get you higher than the quality bagseed thats going around here[texas].i switch too full strength at two weeks.i believe that the saying that early nutrients is wrong is incorrect.thats like saying planting a seed in fertile ground will kill it.my seeds also sprout within 36 hours everytime with the majority growing in 24.to each his own.wish i had a real camera.webcam wont work.peace
  13.  
    shabba

    shabba Active Member

    I water them about once every 3 days & the ph is about 7. I could do with bringing the ph down slightly.
  14.  
    jc83

    jc83 Well-Known Member

    have you checked the ph of the run off water?
  15.  
    jc83

    jc83 Well-Known Member

    also what nutes are you using- NPK?
  16.  
    hydrotech364

    hydrotech364 Evil Genius/Mod

    i use superthrive,miracle grow regular for veg,and 1/4 tbsp per gallon of epson salts,for my dro.it changes for flowering...peace
  17.  
    shabba

    shabba Active Member

    I've attached a couple of pics so you can what I mean about the yellowing, the pics ain't great bcoz I'm using my phone. It seems to be the lower leaves that are most affected. I'm using BioBizz grow NPK & I've got Bloom for flowering.
  18.  
    shabba

    shabba Active Member

    Sorry didn't upload the 1st time!!
  19.  
    shabba

    shabba Active Member

    .......................

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  20.  
    Budda_Luva

    Budda_Luva Well-Known Member

    lol i thought i had a MG defiancy to but like u guys said it was actually nute burn lol

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