Could use a second opinion of Diagnosis

Hey Hey,

I could use a few extra opinions of an issue thats developing in my grow.

Growing Purple Pineberry under 255 watts of LED
SCROG in DWC
Currently 17 days into flower
Advanced Nutrients 3 part
PH 5.8
EC 1.3
Reserior temp 63F
Air temp 73F
Humidity 41%

My new grow is increasingly taking on a light green to yellow color, and affected fan leaves are recent grow, and the yellowing starts at the base of the leaves, not the tips.



I am feeding advanced nutrients 3 part. I was feeding at equal ratio of micro bloom and grow. Looking back it seems kind of the wrong approach, and I realized I may be causing an excess of K. With all three mixed equally I was running about a 4-3-8 ratio

Since I have dialed back to a more balanced ratio and actually cut of the grow completely. Current ratio is 3-3-4 (N from the Micro)

What are you leaf readers seeing here, does that look like K toxicity given the previous ratio? I have been using this as a guide

It kind of looks like a sulfur or iron deficiency also, but lower leaves are not affected, just new grow. I also just raised my lights a little incase I was seeing some sort of light damage.

Let me know what you think, more pictures attached.

Thanks for the help.

Also worth noting the pH and EC have been constant, with only water level changes. I have a pH and EC probe submerged in the rez and check several times during the photo-period.

The ratio was changed to 3-3-4 Wednesday night, difficult to see what the new growth is doing at the moment

I sure think they look extremly healthy, just curious if maybe they are the light green on the new growth simply do to a lack of nitrogen my gut tells me they will darken up as the new growth gets a tad older. I'm not a hydroponic grower so don't know much about that process but if anything it looks like it could use a tad bit of nitrogen.

Guess i should have asked do they start out the new growth dark green and then yellow or is it just starting out this way?

Thanks for the feedback mikey. I thought about nitrogen deficiency too. I may be way off base here, but from what I could find, Nitrogen Deficiency affects the lower leaves first with the yellowing. The lower growth looks nice and healthy though, other than the occasional fan leaf that I tucked under the screen weeks ago.

The pic 02304 may show the issue better, in my experience new growth would always be lighter, but not yellow like what I am seeing

tpc_mikey said:

Guess i should have asked do they start out the new growth dark green and then yellow or is it just starting out this way?

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They are starting out yellow, but some of the fan leaves that were small when I first noticed the issue (and I mean like just emerged small) are showing slight base yellowing too

Yeah I am miffed as well new growth is usually lighter green then the older stuff but i see in that one picture you refrenced how the base of the leaves are distinctly yellow my gut still says nitrogen even though the deficiency is typically seen in the lower leafs first but lets wait for some others to contribute don't just go on my gut lol. Hope they get to looking better how far away are the from the lights by the way and is your fans blowing across the tops towards the light may be from that as well if they have gotten to hot.

gotta add this as well little shocked 17days into flowering there are no noticeable pistals yet on the tops are there any showing on the nods yet? That bud on my profile pic is in my current grow 34 days into flower.

tpc_mikey said:

gotta add this as well little shocked 17days into flowering there are no noticeable pistals yet on the tops are there any showing on the nods yet? That bud on my profile pic is in my current grow 34 days into flower.

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I'm with ya, but there are plenty of pistils on different bud sites (sites that were off of one of the 4 main branches) it just so happens the sites that have the most yellowing don't have obvious pistils in the photos.

Antman15 said:

http://www.growweedeasy.com/iron-deficiency-cannabis

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I read that too - thanks for the link, do you think it can be an iron def caused by or compounded with a K toxicity? Excess K can directly cause iron deficiencies. My Micro and my Cal-mag both have iron, as well as my tap water.

You make sure your timer is working correctly? What are your lights off temps? Are you using anything but 3 part?

SvenskiDWC said:

I read that too - thanks for the link, do you think it can be an iron def caused by or compounded with a K toxicity? Excess K can directly cause iron deficiencies. My Micro and my Cal-mag both have iron, as well as my tap water.

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Yes.

westcoast420 said:

You make sure your timer is working correctly? What are your lights off temps? Are you using anything but 3 part?

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Hey - yes the timer works well, actually just flipped off for the night, day temp are 72-75, night temps likely high 60s, about 65-67, my house is controlled to 65 f at night by my Nest. Besides the three part I have cal mag in small doses or as needed, hygrozyme and voodoo juice (bennies)

Antman15 said:

Yes.

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You blinded me with science, first time I have seen that chart. So was a reduction to a more balanced npk ratio the right move, in your best estimation

SvenskiDWC said:

You blinded me with science, first time I have seen that chart. So was a reduction to a more balanced npk ratio the right move, in your best estimation

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Well I can't be 100%, but I would say that yes, that should help with the uptake of iron. I would think that you should see some improvement soon. Good luck.

Antman15 said:

Well I can't be 100%, but I would say that yes, that should help with the uptake of iron. I would think that you should see some improvement soon. Good luck.

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After reading all that maybe its your ph, maybe you try raising that just a bit and see if it gets better?

In my opinion this is real common. When you flip and you get the stretch the terminals grow rapidly. I think it takes a couple days of photosynthesis to build up chlorophyll in the new growth and turn it dark green.

Before you go dumping stuff on it, I'd just relax 2-3 days, I bet those current yellow leaves will darken (but subsequent new growth will still be pale). If you look at how the leaf clusters open, the tips spread a little first and catch some light so will be darker. The "heart" of the leaf bud then unfolds and it's going to be paler then the tips.

I've seen the same thing on a lot of plants, not just MJ

AimAim said:

In my opinion this is real common. When you flip and you get the stretch the terminals grow rapidly. I think it takes a couple days of photosynthesis to build up chlorophyll in the new growth and turn it dark green.

Before you go dumping stuff on it, I'd just relax 2-3 days, I bet those current yellow leaves will darken (but subsequent new growth will still be pale). If you look at how the leaf clusters open, the tips spread a little first and catch some light so will be darker. The "heart" of the leaf bud then unfolds and it's going to be paler then the tips.

I've seen the same thing on a lot of plants, not just MJ

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Thanks for the feedback, I definitely will make slow adjustments, if I have learned one thing with these plants it's patience and not over reacting/ over correcting is key.

The fan leaves are more predominately yellow today, leaves that were completely green previously

SvenskiDWC said:

The fan leaves are more predominately yellow today, leaves that were completely green previously

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Picture might help here. Whole plant.