Help...deficiency of sometime i think :(

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bp420

Member
They are about 3 weeks old...they started on 24/7 hps lighting and i switched them today to 18/6 becuase someone told me it was more effcient that way. I've been watering them every 3 days or so with ph balanced water. They got their first 1/4 dose of 33-11-11 nutrients today. The temps in my cabinet hover from 80-85.

So the problem i'm having is that the lower leaves start off getting brown spots then the whole leave starts to turn yellow and dies.

Any ideas?

Thanks in advance
 

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smallclosetgrowr

smallclosetgrowr

Well-Known Member
are the bottoms leaves getting enuff light ? if they dont thats what happens that plant will kill them off. looks kinda like mag def
 
Dr. Indica

Dr. Indica

Active Member
Confirmed looks to be a Mag deficiency as they appear in the older, lower leaves first as brown spots. If it continues it will move to the middle leaves next. The leaves will curl upwards before dying, this could be caused by a high pH or the medium is too wet. I would watch for any further symptoms.

Nitrogen deficiency would be more of a yellowing of the leaf and the veins would still be green, stems and veins on the leaf undersides tend to turn a reddish - purple color when a nitrogen deficiency is present.


Hope this helps.
 
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bp420

Member
Dr. Indica said:
Confirmed looks to be a Mag deficiency as they appear in the older, lower leaves first as brown spots. If it continues it will move to the middle leaves next. The leaves will curl upwards before dying, this could be caused by a high pH or the medium is too wet. I would watch for any further symptoms.

Nitrogen deficiency would be more of a yellowing of the leaf and the veins would still be green, stems and veins on the leaf undersides tend to turn a reddish - purple color when a nitrogen deficiency is present.


Hope this helps.
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Ok so my first step would be to check the PH of my soil and if its within the right range I need to get some type of fert that has mag and feed them that?

The way you described the leaves curling upwards is exactly what they are doing.
 
Dr. Indica

Dr. Indica

Active Member
bp420 said:
Ok so my first step would be to check the PH of my soil and if its within the right range I need to get some type of fert that has mag and feed them that?

The way you described the leaves curling upwards is exactly what they are doing.
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Yes, check the pH in the soil and make sure you are not watering too often. Mixing fine dolomite lime into the soil before planting helps guard against both pH issues and calcium and magnesium deficiency's. Dolomite lime is difficult to over apply, as long as you mix it in well. Dolomite also has a neutral pH of 7, and can never raise the pH beyond 7....so it safely stabilizes the pH.

For a remedy water with two teaspoons of Epsom salts( magnesium sulfate ) per gallon of water. Leaves will begin to green starting at the upper most portion and work it's way down to the bottom, and always make sure to check the pH of the water.


You can also try a complete fertilizer, but you might end up over doing another nutrient. bongsmilie
 
B

bp420

Member
Dr. Indica said:
Yes, check the pH in the soil and make sure you are not watering too often. Mixing fine dolomite lime into the soil before planting helps guard against both pH issues and calcium and magnesium deficiency's. Dolomite lime is difficult to over apply, as long as you mix it in well. Dolomite also has a neutral pH of 7, and can never raise the pH beyond 7....so it safely stabilizes the pH.

For a remedy water with two teaspoons of Epsom salts( magnesium sulfate ) per gallon of water. Leaves will begin to green starting at the upper most portion and work it's way down to the bottom, and always make sure to check the pH of the water.


You can also try a complete fertilizer, but you might end up over doing another nutrient. bongsmilie
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Thanks for the input....the soil mix i'm using included 1 small handfull of dolomite lime per 2gallons of mix so it already has some lime in it. I will try the epsom salt and see if that cures my problems.


Edit: the only lime i could find tho was pelletized...not powdered...not sure if that would make a difference.
 
Dr. Indica

Dr. Indica

Active Member
bp420 said:
Thanks for the input....the soil mix i'm using included 1 small handfull of dolomite lime per 2gallons of mix so it already has some lime in it. I will try the epsom salt and see if that cures my problems.


Edit: the only lime i could find tho was pelletized...not powdered...not sure if that would make a difference.
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It does make a difference, if it's granulated it could take up to a year before it breaks down and becomes available. Fine dolomite lime ( powder ) is the only acceptable form to use. You should be able to find it at Lowe's or Home Depot, both of those stores carry it in my area.bongsmilie
 
B

bp420

Member
I mixed up water with 1/4 strength nutes and 2 teaspoons of epson salt and gave them a good watering 2 days ago...it seems to be helping, the brown spots haven't spread to any new leaves. Will water again with same solution tomorrow or the next day and post, hopefully good news lol.

On a side note is it normal for plants that are only 3 weeks old to be rootbound in a 1.5gallon pot? I dumped one over to check the roots today and you basically can't see any soil, its solid white with what looked to be roots completely surrounding the sides. Another thread on that already going but i figure why not ask here to lol. Someone said that it seemed strange so i'm hoping what i saw wasn't mold or something.
 
B

bp420

Member
Dr. Indica said:
It does make a difference, if it's granulated it could take up to a year before it breaks down and becomes available. Fine dolomite lime ( powder ) is the only acceptable form to use. You should be able to find it at Lowe's or Home Depot, both of those stores carry it in my area.bongsmilie
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Well i found powdered lime...buts its called hydrated lime....I check all over the place and no one in my area sells powdered dolomite lime only pellitized.

Do you think hydrated powdered lime will work?
 
Dr. Indica

Dr. Indica

Active Member
bp420 said:
Well i found powdered lime...buts its called hydrated lime....I check all over the place and no one in my area sells powdered dolomite lime only pellitized.

Do you think hydrated powdered lime will work?
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Hydrated lime contains only calcium and no magnesium. Hydrated lime can also alter the pH very quickly. Hydrated lime is also chemically available much faster than dolomite lime and will not buffer the pH like dolomite lime does. I would not use more than 1/2 cup of it per cubic foot of soil. It will work well when used correctly but you will still need a form of magnesium, and you will need to watch the pH of the soil more.:weed:


Hydrated lime also washes out of the soil much easier, and it will overdose your plants if you add too much of it.
 
B

bp420

Member
So do you think i would be better off using the pellitized dolomite or hydrated? I guess i could get a mortar and pestle and powder the dolomite lime myself.

For the Mag i've been using epson salt as someone suggested earlier in this thread.
 
Dr. Indica

Dr. Indica

Active Member
bp420 said:
So do you think i would be better off using the pellitized dolomite or hydrated? I guess i could get a mortar and pestle and powder the dolomite lime myself.

For the Mag i've been using epson salt as someone suggested earlier in this thread.
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If you can't find any dolomite lime in powder form, you probably would be better off crushing it into a powder form. It will work much better than the hydrated lime.:leaf:
 
J

joshkrauss

Active Member
try sweet lime, from what the girl at our local grow store side its the same as dolomite and it is already powdered
 
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