Is this a magnesium deficiency? plants are in coco about 5 weeks into flower. was not using cal-mag as coco said it was buffered and i didnt need to... but it seems that was bulshit? i got some cal-mag but as its only a mag def will this fix the issue? I dont wanna give them them to much cal?
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Magnesium Deficiency?
- Thread starter adz007
- Start date
Thats really a nice textbook picure of interveinal chlorosis....
There are 3 main reasons a plant will yellow.....
Nitrogen....
Magnesium...
Iron.....
Sulfur is possible but its an extremely rare condition and you have to try pretty hard to get it....
SO look at the other 3....
You should be able to determine which of the 3 it is by the location on the plant....
Nitrogen.... lower large leaves.... veins also yellow.... the plant is translocating nitrogen to younger parts of the plants.... especially if it doesnt have enough N....
Iron... Iron def will always occur at the growing points and top..... a leaf as its produced will go from green to chlorotic..... the plant simply runs out of iron......
In your case.... magnesium.....These leaves were at one time fully green.... the plant is also attempting to translocate magnesium within the plant..... because magnesium is more difficult to move the deficiency will be noted in the middle of the plant....
Normally a node or two from the top of the plant.....
Nitrogen...bottom of the plant....
Iron....top of the plant....
Magnesium....middle of the plant.....
There are 3 main reasons a plant will yellow.....
Nitrogen....
Magnesium...
Iron.....
Sulfur is possible but its an extremely rare condition and you have to try pretty hard to get it....
SO look at the other 3....
You should be able to determine which of the 3 it is by the location on the plant....
Nitrogen.... lower large leaves.... veins also yellow.... the plant is translocating nitrogen to younger parts of the plants.... especially if it doesnt have enough N....
Iron... Iron def will always occur at the growing points and top..... a leaf as its produced will go from green to chlorotic..... the plant simply runs out of iron......
In your case.... magnesium.....These leaves were at one time fully green.... the plant is also attempting to translocate magnesium within the plant..... because magnesium is more difficult to move the deficiency will be noted in the middle of the plant....
Normally a node or two from the top of the plant.....
Nitrogen...bottom of the plant....
Iron....top of the plant....
Magnesium....middle of the plant.....
Wow amazing thank you so much yes I was thinking it was a mag def now I know it is thanks to your awesome breakdown. Yes they are a node of 2 from the top of plant and used to be green. have just given them a dose of cali-magic at the recommended dose for coco at 1ml per litre. Will this be fine or should I give them a bit extra?
Im not sure you need to do anything really.....
often this shows up in the middle of veg and its more important to do something....
The calmag wont hurt it.... just made sure it doesnt have nitrogen in it....
If it does probably better to pass ......
ANd then use calmag next round.....
often this shows up in the middle of veg and its more important to do something....
The calmag wont hurt it.... just made sure it doesnt have nitrogen in it....
If it does probably better to pass ......
ANd then use calmag next round.....
william albrecht did a lot of work promoting the idea that calcium was the pivotal key unlocking nutrients availability to the plant. he really took on dolomite lime as being far too heavily mg weighted.
why do you have a mg. deficency?
is there [B]unavailable mg.[/B] in your medium?
william albrecht believed that plentiful pure calcium was essential to the plants capacity to uptake nutrients.
https://www.google.com/search?q=alb...e=UTF-8#es_sm=122&espv=210&q=albrecht+calcium
^^ google search (albrecht +calcium ). lots of articles. some pro, some con.
i see posts on trace minerals that avoid the fact that trace minerals can take decades, centuries to become available to the plants.
availability ( calcium, mg., trace minerals, etc...) is the concept to focus on.
availablity is being overlooked far too often.
why do you have a mg. deficency?
is there [B]unavailable mg.[/B] in your medium?
william albrecht believed that plentiful pure calcium was essential to the plants capacity to uptake nutrients.
https://www.google.com/search?q=alb...e=UTF-8#es_sm=122&espv=210&q=albrecht+calcium
^^ google search (albrecht +calcium ). lots of articles. some pro, some con.
i see posts on trace minerals that avoid the fact that trace minerals can take decades, centuries to become available to the plants.
availability ( calcium, mg., trace minerals, etc...) is the concept to focus on.
availablity is being overlooked far too often.
My tap is high in lime, akalinity, pH. It has 4-5 times the Ca as Mg, and a tiny amt. of Fe and other trace mins. Before mixing nutes, I bring the pH down to high 6's to 7 with Citric acid. This combines with some of the lime to make the Ca, Mg, etc. more available as citrates. I have good luck doing this and using EJ Microblast which has chelates of Mg, and the other usual trace mins. I think Fe is often overlooked when trying to green plants up. I use Gypsum [Calcium sulfate] rather than Dolomite to amend my coco. This also adds sulfates. All this gives me a free hand to apply whatever I think is needed if the plants yellow at all. And thanks for the great clarification, Burnt Rope-
[FONT=Arial, Helvetica, sans-serif]Nitrogen...bottom of the plant....
Iron....top of the plant....
Magnesium....middle of the plant.....[/FONT] Good luck. -granger
[FONT=Arial, Helvetica, sans-serif]Nitrogen...bottom of the plant....
Iron....top of the plant....
Magnesium....middle of the plant.....[/FONT] Good luck. -granger
Last edited:
Also, please check yur roots, pests can hide there and
mess you up.
Otherwise, you'll be fine.
mess you up.
Otherwise, you'll be fine.
gliders420
Member
I've read that a magnesium deficiency can stunt or slow growth, what classifies the plant as stunted? Or how long does any plant need to be deficient before permanent damage has been don and you need new plants, or in my case a few week old clones? Or is it that as long as you fix the def sometime in veg the plant is ok..? I'm sure older plants wod be different compared to clones
The damage leaves won't recover, however, leave them on
your plants until they drop. The plants uptake is compromised,
so all hands to the pumps, so to speak.
Keep notes and pics of the recovery.
Newer rooted cuttings may be more fragile than mature plants.
your plants until they drop. The plants uptake is compromised,
so all hands to the pumps, so to speak.
Keep notes and pics of the recovery.
Newer rooted cuttings may be more fragile than mature plants.
not enough info.
theres no calcium problem there and it doesnt look like mag
need pics of the rest of the plants.
looks more like lockout or an environmental issue than it does mag.
Is this just a couple of leaves from the bottom, or are the entire plants fading?
Is this an 8 or 12 week strain?
theres no calcium problem there and it doesnt look like mag
need pics of the rest of the plants.
looks more like lockout or an environmental issue than it does mag.
Is this just a couple of leaves from the bottom, or are the entire plants fading?
Is this an 8 or 12 week strain?
sagebrush802
New member
keep an eye out for root aphids, dig around alittle in your medium, look for them.....they cause damage that looks very simialar to magnesium def.....
Like for me it's looks like some lockout (P,Mg and K), all kind of you can see on your leaves pics, what can happen by few reasons.
1. High level of Ca. (lock Mg, P and probably K)
2. Overwatering - reduce root breathing, uptake of P and overall elements.
3. pH issue
4. point 1+2
for more correct answer please provide more info about your grow and overall plant photo.
Cheers
1. High level of Ca. (lock Mg, P and probably K)
2. Overwatering - reduce root breathing, uptake of P and overall elements.
3. pH issue
4. point 1+2
for more correct answer please provide more info about your grow and overall plant photo.
Cheers
Sagebrush gave you some good advice. I am very experienced [alas] with RA's. This looks like straight Mg deficiency to me, easily fixed, especially since you haven't been giving them Mg. But it would be very wise to check for RA's.
The easy and sure way to do that is to place 1" thick raw potato slices on the medium. After a day or 2 there will be RA's on the bottom side of the slices if you have RA's. In the meantime get some Epsom to them, or better yet, EJ Microblast. Good luck. -granger
The easy and sure way to do that is to place 1" thick raw potato slices on the medium. After a day or 2 there will be RA's on the bottom side of the slices if you have RA's. In the meantime get some Epsom to them, or better yet, EJ Microblast. Good luck. -granger
