Does too much Nitrogen lock out Phosphorous?

jimbonorman

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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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.
 
Budzbuddha said:
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.
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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.
 
jimbonorman said:
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.
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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?
 
PadawanWarrior said:
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?
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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.
 
jimbonorman said:
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.
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What standard yellow meter? How are you testing the soil pH?
 
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.
 
Mix molasses and then pH it, just like you would your nutes solution. Most nutes bring the pH down as well.
 
go go kid said:
Mix molasses and then pH it, just like you would your nutes solution. Most nutes bring the pH down as well.
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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.
 
PadawanWarrior said:
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.
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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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