Strange Deficency - What is it?
- Thread starter SStevens
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TrimothyLeary
Well-Known Member
Err... are you pHing your solution? What pH?
TrimothyLeary
Well-Known Member
Ah. Maybe let your pH go up a little, just over 6. Mg, even in hydro has best uptake at a pH over 6.
TrimothyLeary
Well-Known Member
Every nutrient uptake chart I've ever seen shows a decline in Mg uptake at right about 5.8pH, for hydro. Like, it literally dips way down between 5.6 and 6.0.
I suggest pH, as this is the most common source of Mg deficiency symptoms. The grower is using tap water, which is usually sufficient in Mg and Ca during vegetative growth. The nutrients contain each as well. There shouldn't be a deficiency at this point.
If they were in flower, it might be a different story.
But that's as far as I'll argue it.
coreywebster
Well-Known Member
S Stevens is the problem at the top or bottom of the plant?
TrimothyLeary
Well-Known Member
Not my plant, and can't tell by the photos.
coreywebster
Well-Known Member
Push your Ph to 6.2 if its a mag deficiency. Trimothys spot on with his info. Coco users often have to add cal.mag but its usually for the Cal. Tap water will likely have everything you need, your just too low ph for it to be absorbed
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DraculaReactor
Member
That isn't a deficiency, you are giving your plant too much nitrogen. Look up nitrogen toxicity, I'd ease up a little on your ppm. Should come right out of it in a few days.
DraculaReactor
Member
Remember: deficiencies would start from the vain and move outward, if it were a deficiency, you'd see lighter growth coming from the center out. A toxicity is identified by affected tips and margins. Your tips are just beginning to burn, and a very dark green is almost always an indication of too much nitrogen. I'm 100% sure it's nitrogen toxicity.
coreywebster
Well-Known Member
Hes only feeding every other water. It doesn't look like N tox at all
coreywebster
Well-Known Member
I think you need to adjust your monitor, they are not dark green, no clawing.
this is dark green!
this is dark green!
TrimothyLeary
Well-Known Member
That is absolutely not a nitrogen toxicity.
It looks more like an N deficiency than a toxicity, based on the interveinal chlorosis. Tip burn isn't caused by N, it's caused by P.
If that was N toxic, the leaves would be dark, dark black.
N toxicity(excess, rather) rarely damages the leaves. It makes the plant grow big, with lots of big, dark green leaves and shoots, and delays flowering. K toxicity is far more common as the culprit behind tip burn.
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DraculaReactor
Member
The vain is very dark, meaning that the toxicity is just setting in. If you are concerned about magnesium, add 1 gram of epsom salt per gallon of water to your next feeding. If the situation doesn't improve, I would have to think you have a nitrogen problem.
TrimothyLeary
Well-Known Member
No. And it's a vein.
coreywebster
Well-Known Member
Yup, theres yellowing that maybe makes the green look darker in contrast. no chance its N tox!