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is this magnesium deficiency?
- Thread starter Oski
- Start date
Blackvelvet
Member
If the leaves look like that more toward the bottom than top = magnesium deficiency. If it is more severe on top leaves/new growth then = iron deficiency. Best guess is magnesium deficiency. 2 teaspoons epsom salts per gallon of water once. For overnight results, spray 1 tablespoon epsom salts per quart of water on both sides of the leaves instead of watering the soil with epsom.
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G
Guest
A better way to determine the diff between iron and mg is not where on the plant it occurs....
WIth mg def the new growth is green... with iron its clorotic.....
that is until the Mg def gets super severe.....
This is true initially...
this looks like Mg def....
WIth mg def the new growth is green... with iron its clorotic.....
that is until the Mg def gets super severe.....
This is true initially...
this looks like Mg def....
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G
Guest
Not likely....
Let me explain...
Iron cant be moved around in the plant like say Nitrogen....
Thats why leaves yellow... the plant is moving N to the new growth....
WIth magnesium the plant can move it somewhat....
thats why you get interveinal chlorosis.... cause the plant is moving it to new growth...
Iron is fairly immobile.... it cant be moved to new growth....
when the plant runs out of iron the chlorosis is dramatic....
because during manufacting the leaf it has no iron available and cant move it from existing growth either.....
The incidence of mg def is way higher too in cannabis...
Let me explain...
Iron cant be moved around in the plant like say Nitrogen....
Thats why leaves yellow... the plant is moving N to the new growth....
WIth magnesium the plant can move it somewhat....
thats why you get interveinal chlorosis.... cause the plant is moving it to new growth...
Iron is fairly immobile.... it cant be moved to new growth....
when the plant runs out of iron the chlorosis is dramatic....
because during manufacting the leaf it has no iron available and cant move it from existing growth either.....
The incidence of mg def is way higher too in cannabis...
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thanks for the replies.
ive foliared spray the plant with epsom salts and increased the ec to 1.9.
there is also 2 teaspoons of epsom salts in the res but the roots arent properly establishing in the res yet which is why ive foliar sprayed with epsoms.
how long does it take to see any improvement from foliar spraying epsoms? i used 1 teaspoon for 1L and gave the plants a really good spraying both on top and underneath the leaves.
cheers
oski
ive foliared spray the plant with epsom salts and increased the ec to 1.9.
there is also 2 teaspoons of epsom salts in the res but the roots arent properly establishing in the res yet which is why ive foliar sprayed with epsoms.
how long does it take to see any improvement from foliar spraying epsoms? i used 1 teaspoon for 1L and gave the plants a really good spraying both on top and underneath the leaves.
cheers
oski
Well like oo said, and I do agree with, you should see some greening up starting tomorrow.. I think with increasing you nutes you will take care of the problem...
You said your roots aren't establihed???? if these are small plants that would change the diagnoses, at least in my opinion..... Mag def usually show up at around 5 wks in pot plants in earlier than that would not be expected unless there was NO MAG at all availble to the plant its entire life...
As for Iron.. I have had this def myself... it is indicated in the NEWEST growth being yellow..l totally yellow but otherwise normal looking, and often its because the root medium is too cold inhibiting IRON uptake.
Let us know how the spraying went..
peace
BB
You said your roots aren't establihed???? if these are small plants that would change the diagnoses, at least in my opinion..... Mag def usually show up at around 5 wks in pot plants in earlier than that would not be expected unless there was NO MAG at all availble to the plant its entire life...
As for Iron.. I have had this def myself... it is indicated in the NEWEST growth being yellow..l totally yellow but otherwise normal looking, and often its because the root medium is too cold inhibiting IRON uptake.
Let us know how the spraying went..
peace
BB
G
Guest
bergerbuddy said:
Good point about the leaves being normal....
thats on my checklist for iron def.....
I think its pretty rare... but once youve really seen it its pretty unmistakable...
That newest growth is not limited to the top of the plant....
All new growth will show the same yellowing....
another way to tell iron def..
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hi
heres what the plants look like today - they were foliar sprayed thoroughly with epsom salts yesterday and the ec of the res was raised to 1.9.
they were only transferred to bubblers 5 days ago, they looked pretty much the same then. they were in 100% perlite before the transfer
any input would be appreciated.
thanks
heres what the plants look like today - they were foliar sprayed thoroughly with epsom salts yesterday and the ec of the res was raised to 1.9.
they were only transferred to bubblers 5 days ago, they looked pretty much the same then. they were in 100% perlite before the transfer
any input would be appreciated.
thanks
i should also add, until yesterday, the res level was about 2" into the net pots until i lowered it to about 2" below the net pot.
so could overwatering be a factor?
thanks
In this case Yes.
oh and just one more thing LOL, i increased the number of pumps to 4 x 150L p/h dual outlet and 10 airstones yesterday to make sure the res was REALLY being SUPER oxygenated.. over kill perhaps....
Eh more the better
Sin
so could overwatering be a factor?
thanks
In this case Yes.
oh and just one more thing LOL, i increased the number of pumps to 4 x 150L p/h dual outlet and 10 airstones yesterday to make sure the res was REALLY being SUPER oxygenated.. over kill perhaps....
Eh more the better
Sin
Good
Good
Keep your rez just to the bottom of the pot.
The bubbles should splash enough on and near the roots untill they reach the top of your water.
Then lower about 2 inches below your pot or a little more. Like you have now.
Would have been nice to see these pics and and know about your Rez level early on. They should be fine.
Sin
Good
Oski said:
Keep your rez just to the bottom of the pot.
The bubbles should splash enough on and near the roots untill they reach the top of your water.
Then lower about 2 inches below your pot or a little more. Like you have now.
Would have been nice to see these pics and and know about your Rez level early on. They should be fine.
Sin
