Does too much Nitrogen lock out Phosphorous?

jimbonorman

Well-Known Member
Hey folks, I’ve been a bit too aggressive with my nutes and my Malawi has been showing some major N toxicity with clawing leaves. It’s been a week or two of trying to remediate this with flushing but I’m now seeing what looks like Phosphorous deficiency…so I’m wondering if too much N locks out the P - does one lead to the other?
 

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Budzbuddha

Well-Known Member
Flushing also screws things up .

Those Malawi ( grew Malawi Gold before ) just know she is a long hauler. You probably jumped the gun and blew something out of ordinary , possibly adding the issues now seen.

A long running sativa would have worked thru the excess ….

PLUS …..
Good landrace sativa s like hot , dry conditions to really kick it up.
As far flushing , it does more issues - especially if plant may be stressed already or torched by nutes / light. It unbalances the medium even more because of a forced leaching - mycos and all.
 

jimbonorman

Well-Known Member
Flushing also screws things up .

Those Malawi ( grew Malawi Gold before ) just know she is a long hauler. You probably jumped the gun and blew something out of ordinary , possibly adding the issues now seen.

A long running sativa would have worked thru the excess ….

PLUS …..
Good landrace sativa s like hot , dry conditions to really kick it up.
As far flushing , it does more issues - especially if plant may be stressed already or torched by nutes / light. It unbalances the medium even more because of a forced leaching - mycos and all.
Well I don’t know what to tell ya. The best I can figure is too many nutes and I’m dialing them back a bit now. She did have one or two days that breached 80 degrees in the tent but that was about a month ago and she didn’t like that, but I didn’t witness a long-standing disruption as a result of that…

I’ve been giving each plant about a 1/2 tbsp of organic molasses once a week as well but I don’t reckon that would be so deleterious.
 

PadawanWarrior

Well-Known Member
Well I don’t know what to tell ya. The best I can figure is too many nutes and I’m dialing them back a bit now. She did have one or two days that breached 80 degrees in the tent but that was about a month ago and she didn’t like that, but I didn’t witness a long-standing disruption as a result of that…

I’ve been giving each plant about a 1/2 tbsp of organic molasses once a week as well but I don’t reckon that would be so deleterious.
Are you sure your pH is 6.5-6.7? Molasses can lower soil pH. How are you checking it? And how much CalMag have you been adding?
 

jimbonorman

Well-Known Member
Are you sure your pH is 6.5-6.7? Molasses can lower soil pH. How are you checking it? And how much CalMag have you been adding?
I check my ph before every watering with the standard yellow meter (cheap, but not total garbage). I always need to bring it down from 8+ with some organic granulated citric acid. Maybe it's time I calibrated the meter?

Regarding the Cal-Mag, I've been using Roots Organic Elemental and have been giving it 2 tbsp every week. I'm in a 5 gallon pot, but I wonder if that's too much now that I see the Mulders chart.
 

PadawanWarrior

Well-Known Member
I check my ph before every watering with the standard yellow meter (cheap, but not total garbage). I always need to bring it down from 8+ with some organic granulated citric acid. Maybe it's time I calibrated the meter?

Regarding the Cal-Mag, I've been using Roots Organic Elemental and have been giving it 2 tbsp every week. I'm in a 5 gallon pot, but I wonder if that's too much now that I see the Mulders chart.
What standard yellow meter? How are you testing the soil pH?
 

go go kid

Well-Known Member
Your plant doesn't eat molasses, it's used to feed the microbiology living within your soil. I suggest you head over to the organic section and start reading.
 

go go kid

Well-Known Member
Mix molasses and then pH it, just like you would your nutes solution. Most nutes bring the pH down as well.
 

jimbonorman

Well-Known Member
Mix molasses and then pH it, just like you would your nutes solution. Most nutes bring the pH down as well.
I know what molasses does - that’s exactly why I’m using it. I appreciate the advice, though, and will ph after mixing it in the water.
 

jimbonorman

Well-Known Member
Even though you're putting in 6.5 pH water doesn't meant the soil pH is at 6.5. When I see twisting leaves my first thought is pH, but it could be other things too. If you've been using a bunch of pH down I'd bet the soil pH is lower than you think. But more info would help everyone.
Just so I understand correctly, are you saying that over time the ph down in the water may present a residual effect on the soil and, thus, lower the soil ph?
 
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