Possible N deficiency and leaf edges pointing up/canoeing

About 3 weeks of 12/12. So in one picture you can see the bottom of the plant where the fan leaves are turning yellow and falling off. Is this nitrogen deficiency? The other pics show the top of the plant where the edges of the leaves are pointing up. I thought maybe heat stress but there is another plant just as close to the light that looks fine. What do you guys think?

if you have switched to bloom nutes then yeah, thats the start of the plant sucking the N right out of its self. the cupping, im not sure, maybe water stress? a little more info might help everyone help you. what you are growing in, what kinda light, size, nutes, blah blah blah.

I', growing in Black Gold soil mixed with about 15% perlite. GH maxigrow and maxibloom and GH Organics cal mag all at full doseage. Using RO water. ph to 6.5 before feeding. I feed every watering which is about every 5-6 days.

looks like underfeeding cus the bottom leaves are already dying off and you got 4 weeks to go atleast. the canoeing may be heat/humidity related not sure or some sort of stress lol i usually dont worry about that as much as yellowing off that early. if you havent started adding nutes by now i would start asap if you have been you are locked out somehow and need to leech and slowly start back

The Praying Leaves. She'll fold along the mid rib to reduce the surface area of the leaf to the light. That's a normal thing in some strains.
The yellowing fan leaves. Yah it looks like she might want some more (N) looking at the middle of your plant the fan leaves are staring to lose there chlorophyll starting at the tip work back to the base of the leaf.
Don't go crazy with the (N). Your fan leaves will yellow on you and die, But a little later than 3 weeks in like yours.

Good Luck on Your Grow.

It looks like an autoflower to me. It doesn't look like its deficient in Nitrogen at all. Its using its leaves for energy which is normal in my opinion. But I may be wrong.

This is not an autoflower strain. It's Jack Herer vegged for nearly 3 months under cfls then flowered under a 1000w hps. I used a 50/50 combination of grow and bloom for the first week of flower then switched to only bloom nutrients on week 2.

use grow for 3 more weeks imo if not longer

OK i watered her last night with a 50/50 mix of grow and bloom nutrients, 1tsp of each. It also looks like she might have a slight magnesium defeciency. Should I add some epsom salts? If so, at what ratio (tsp/gal)?

fui,
I've found that nute labals tend toward the high side. At 1 tsp each of the MaxiG and MaxiB...you are possibly running an excessive PPM. Depends also on what your water PPH looks like. So definitely do not add mgso4 to that mix. Ease up just a tad...like to 3/4 dose nutes unless you do have a ppm or ec meter. Alternate feeding with water...like maybe water at least twice and then feed. And you could add the Epsom salts to the water only and be ok. Perhaps 1/4 tsp per gallon unless you have a full on Mag deficiency (interveinal chlorosis). Questions?
JD

JohnDee said:

fui,
I've found that nute labals tend toward the high side. At 1 tsp each of the MaxiG and MaxiB...you are possibly running an excessive PPM. Depends also on what your water PPH looks like. So definitely do not add mgso4 to that mix. Ease up just a tad...like to 3/4 dose nutes unless you do have a ppm or ec meter. Alternate feeding with water...like maybe water at least twice and then feed. And you could add the Epsom salts to the water only and be ok. Perhaps 1/4 tsp per gallon unless you have a full on Mag deficiency (interveinal chlorosis). Questions?
JD

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My ppm has been around 1200 and 6.5 ph for the last couple weeks and I have been feeding every 5 days. What makes you think this is excessive? The plant seemed to love this much nutrients earlier.

It looks more like over fertilized to me. flush it with enough pure water, to collect runoff, check Ph and PPM of your runoff. From that you can tell if you over or under fertilizing your plants.

PS. I wouldn't use full amount of recommended nutrients, always start with 1/4 and slowly adjust it to 3/4

Cupping I was told is to dry/low humidity but im not positive on that

Dannoo93

What are your temps and rh?
1000w in what looks like a tent
probably too hot and too dry and over fert.

yellowing from the bottom going up is nitrogen i dunno what you guys are thinking but he could of locked it out and 1200 ppm isnt maxed out. always water then feed water then feed. you will still manage to get your feeding in once a week because your going to have 2 waterings a week usually. i get up to 1400-1500 ppm at peak flowering no problem.

and nutrient burn will actually look like the tips of the leafs are burnt and the tips of the jagged parts will be brown too unless its severe then it will just be all over the plant but like i said it looks like it yellowed from the very bottom going up and the plant is needing more nitrogen. theres not enough nitrogen in bloom formulas to keep plants green.

JohnDee said:

I wrote: you are possibly running an excessive PPM. And I explained my thinking regarding labeling.

But to reiterate,
you started out with a rich organic soil
You are feeding chemical nutrients at maximum dosage...
...every 5 days (I assume every watering)
and your plants are now doing poorly
And you think this is N deficiency

These are all your words and not mine. I think you may have nutrients stacking up in the soil...and preventing proper uptake.

But you're there with the plant...not me.
JD

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Thanks for the input JD,
I think I should say that I didn't start out with full strength nutes, I worked my way up from about 1/4 strength. The soil I use is .05-0-0. I think it just has ewc's in it. Anyways, are you suggesting nutrient lockout from salt build up, or that they have nute burn? I guess either way I need to flush. I'll take a look tonight and see if they have made any progress and go from there. Thanks again

no matter the problem the leaves are not going to fix themselfs they will stay that color just keep an eye on progression up the plant and new growth.

Wienerm0bile...
What's the deal, you change your username or are we being spammed? If indeed you are the OP, when you flush...be sure to check PPM of runoff water which will then reveal if you have the nute issue I suspect. No indication of nute nurn that I can see...but if nutes are indeed locked out...well then you wouldn't.

And MrBlu...if the yellowing is from a pure N deficiency, the leaves will green up. N is a mobile nutrient.
JD

JohnDee said:

Wienerm0bile...
What's the deal, you change your username or are we being spammed? If indeed you are the OP, when you flush...be sure to check PPM of runoff water which will then reveal if you have the nute issue I suspect. No indication of nute nurn that I can see...but if nutes are indeed locked out...well then you wouldn't.

And MrBlu...if the yellowing is from a pure N deficiency, the leaves will green up. N is a mobile nutrient.
JD

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Cool. I'll flush in a couple days when they need a watering and I'll check the runoff ppm. Should I flush with a mild nutrient solution? Maybe a 10-10-10 at 1/4 strength?