Is this magnesium deficiency ??

K

Komonsense

Member
Robar said:
I don't think a reasonable amount would hurt but I don't remember how line it takes for the plants to be able to uptake. As I can see it you have an early indication of a coming problem that looks like mag def. You said you don't have mag added to your mix other than trace amounts coming from castings which your plant seems to have drawn to depletion. Biggest thing beyond that is you are watering with dead water. My r/o comes out of my super cheap r/o filter is 4ppm I assume your is similar so there is nothing balanced or imbalanced it's just not there and your water should be real close to Ph of 7. As long as your plant roots aren't like in the 50's or lower you shouldn't be having much problem in that direction. If I have all the info correct there isn't anything stopping the uptake of magnesium except the lack of magnesium. The easiest way to supply it at this point is to feed every watering with cal/mag at 150-175 ppm with every watering. I'm not a cal/mag fanboy however I do use a calcium/magnesium supplement with every watering until the last 2 weeks of flower. Since I started using it religiously in my R/O water I've suffered no mag problems.
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So I’m only using organic and don’t want to add cal/mag bottled nutes other suggestions ?
 
K

Komonsense

Member
Robar said:
Yep that's what I think he has only in the very earliest stage. I used to suffer it a lot before I understood you had to supplement it if using R/O water especially when using small pots.
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what should I supplement with if I’m in organics I’ve got dolomite lime, Epsom salts, gypsum, but like a previous post said Epsom and gypsum both have sulfur and I don’t wanna double dose the sulfur they have bottled organic cal/mag but I’m not sure how organic it really is
 
K

Komonsense

Member
Robar said:
Do you think I've misdiagnosed? Seriously interested not flaming. Been growing off and on all my life but still consider myself a student with more to learn.
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hydrokid was telling me about the leaves saying different for the light distance not the mag def
 
HydroKid239

HydroKid239

Well-Known Member
Robar said:
Do you think I've misdiagnosed? Seriously interested not flaming. Been growing off and on all my life but still consider myself a student with more to learn.
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Most definitely not. I just wanted to point out that little detail for the OP. I’m here to learn more about identifying deficiencies, and hearing experience from seasoned growers like yourself. I’ve only been at it enough to correctly identify the light stress on the leaves up top.
 
Robar

Robar

Well-Known Member
Komonsense said:
what should I supplement with if I’m in organics I’ve got dolomite lime, Epsom salts, gypsum, but like a previous post said Epsom and gypsum both have sulfur and I don’t wanna double dose the sulfur they have bottled organic cal/mag but I’m not sure how organic it really is
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I use Botanicare cal-mag plus it's kinda organic friendly. Its based from minerals I think.
 
HydroKid239

HydroKid239

Well-Known Member
Robar said:
I use Botanicare cal-mag plus it's kinda organic friendly. Its based from minerals I think.
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I’ve used that, as well as AN’s calmag xtra which is supposed to have iron & micro nutrients.. but I like the plants response to Botonicare much better.
 
Robar

Robar

Well-Known Member
I'd also like to make a comment in general about pot size. I've played with them all from 2 liter pop bottles to 50 gallon totes as pots. Using anything less than 10 gallons with virtually any soil mix requires supplements before the end of flower. Even then some cannabis lines have serious demands of some nutes where another may have light demands. Cannabis plants are as varied as people even siblings. How many times have you grown out a pack of seeds and none were the same? Similar but not the same kinda like families that have 10 or 12 kids. Each of those kids have different needs just like cannabis plants. A big pot with lots of mild soil can provide for every need at an amount for the neediest plant without being toxic. A small pot simply cannot.
 
Robar

Robar

Well-Known Member
Komonsense said:
I have some of this coming today
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That should do the trick do you have a meter to read ppm?
*If not follow instructions starting at 2ml per gal I suggest that as you are starting from an assumption near complete depletion based on the fact you added very little to the mix to start with. On the other hand if you do have one adjust to 150-17 5ppm as I've already mentioned and you should be good.
 
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Catskillze

Catskillze

Member
It has been my experience that a thriving organic grow is dependent on how much a diversified amount of organic matter is in your mix. A organic mix that is thriving with microbes is always more acidic as the organic matter is breaking down. Dolomite lime in extremely small amounts helps balance the act of a already slightly acidic soil. Dolomite unlike the other types of lime will only raise or lower the ph to 7 as it is considered neutral. Magnesium seems to be one of the slowest moving micro nutrients. Many times I encounter mag def when my temps get low enough that the plant will no longer absorb it. Personally I would say a couple weeks into a magnesium issue either through low temps or your mix has become slightly too acidic as the organic matter breaks down. A worm tea will help but keep track of everything you put in your mix for future cycles. Dolomite or diatomaceous earth are a organic growers staple ingredient
 
Robar

Robar

Well-Known Member
Komonsense said:
Yes I do so I’m looking for like 150ppm of cal/mag ??
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Yes. Every watering. I don't believe at those levels it can accumulate in the soil to any useful degree considering the life cycle of a plant grown for premium herb but is enough to give the plant what it needs per watering.
 
K

Komonsense

Member
Robar said:
Yes. Every watering. I don't believe at those levels it can accumulate in the soil to any useful degree considering the life cycle of a plant grown for premium herb but is enough to give the plant what it needs per watering.
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Awesome while you’re helping me same plant purple stems, I topped and LSTed so It could be from the stress or just genetics but idk doesn’t seem healthy any knowledge on purple stems ?
 

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