Magnesium Deficiency
- Thread starter shabba
- Start date
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!
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!
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
, 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
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!!!
Epsom salt is Magnesium sufate which contains mg and sulfurs!!!
LocoMonkey
Well-Known Member
Shabba, do you have any pics. That would help diagnosis
LocoMonkey
Well-Known Member
How old are the plants? have you given them any nutrients?
Hydrotech364
Well-Known Member
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
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.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.................
Hydrotech364
Well-Known Member
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
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