Strange Deficency - What is it?

What is the problem here?

I am using Advanced Nutrients CoCo Formula 2-Part System for my vegatative fertilizer. I have been using nutrients ever other water. I am also using tap water.

20/4 Light Schedule

i think its the start of a magnesium def.

Yea, Mag def, your plant is probably starting to lockout, don't know what medium you are growing in, but if adding some mag doesn't work, try a flush?

I am currently using coco coir as my growing medium. I will use my Advanced Nutrients Sensi Cal/Mag and see what happens. I was just about to switch over to flower too. Damnit! : ( I guess it will have to hold off for a week or two.

Err... are you pHing your solution? What pH?

Ph is at 5.8

SStevens said:

Ph is at 5.8

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Ah. Maybe let your pH go up a little, just over 6. Mg, even in hydro has best uptake at a pH over 6.

According to Jorge Cervantes "in a Non-Organic Hydro set up, you want the PH between 5.5-5.8 In an Organic Hydro setup, PH should be between 6-6.5"

PotatoBug said:

According to Jorge Cervantes "in a Non-Organic Hydro set up, you want the PH between 5.5-5.8 In an Organic Hydro setup, PH should be between 6-6.5"

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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.

S Stevens is the problem at the top or bottom of the plant?

coreywebster said:

Trimothy, is the problem at the top or bottom of the plant?

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Not my plant, and can't tell by the photos.

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

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.

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.

DraculaReactor said:

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.

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Hes only feeding every other water. It doesn't look like N tox at all

I think you need to adjust your monitor, they are not dark green, no clawing.

this is dark green!

DraculaReactor said:

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.

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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.

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.

DraculaReactor said:

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.

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No. And it's a vein.

Yup, theres yellowing that maybe makes the green look darker in contrast. no chance its N tox!