Iron Deficiency??

raggyb

raggyb

Well-Known Member
same question going through my head right now, along with what's a Maganese deficiency look like.
 
raggyb

raggyb

Well-Known Member
hotrodharley said:
Like this one? I find this one more useful but I have grown a couple of plants before.

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Mn, Necrosis and spots.
Necrosis, hmm, here's a called out CaMg Necrosis, or maybe it was Mn? Or maybe this chart has error
Rider509 said:
Underside of leaf.
View attachment 4122546

Top of leaf.
View attachment 4122548

Closeup of necrosis.
View attachment 4122550

This has got me stumped because it doesn't appear to be systemic. This issue is only apparent on several mid-plant leaves on different stems. The rest of the plant looks very healthy. There is no pest problem. Guesses are welcome but I'm hoping someone has BTDT.

This is a pure Thai sativa that is grown in hydro using only Flying Skull dry nutes, Flora Extract, and Z7, plus Mendocino nitrogen-free Cal-Mag. Growing conditions are controlled and monitored electronically within very specific tolerances.
One month into flower.
pH: stable at 5.7
res temp: 68F day to 66F night
Temps: 84F day to 69F night
Rh: 70% day to 45% night
CO2: 700ppm to 1000ppm
Nute strength: 1100ppm Hanna; 900ppm nute, 200ppm cal-mag
PAR: uniform at 950μmol
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raggyb

raggyb

Well-Known Member
So the peeps posting this got me thinking of above Q, because it shows soil has a unstable point at 6.5 pH above which you dont get Mn and Fe, and below which you don't get P/Ca/Mg. So I don't know if you get all or is it none of those 5 at pH6.5 in soil. ouch.
blowincherrypie said:
You gotta get that ph up.. especially now that you flipped. You're getting your Mg and probably P locked out from looks of things. Those tips curling up etc.

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oh and I forgot this chart for completeness

xSwimToTheMoon said:
This the one?
https://www.rollitup.org/attachments/screenshot_2015-03-14-02-48-32-png.3371520/
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T

Tim1987

Well-Known Member
Growes73 said:
View attachment 4009390
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How close is the your light?
How strong is your feed?

Growes73 said:
View attachment 4009392
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Looks like most tops to the left are generally green?
Whereas the tops toward the centre of your tent are yellowing?
What is your light source?
Canopy temps?

Tbh i think it could do with some plain water as well.

Ph of your media?
Ppm of your feed? How often?
What type of medium?
Watering how often?

Could be a few things.
It doesnt immediately look like iron deficiency.
Looks either under, or over nuted/salty.
Or ph issues.
Or both.

Need more information.

:peace:
 
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raggyb

raggyb

Well-Known Member
Tim1987 said:
How close is the your light?
How strong is your feed?



Looks like most tops to the left are generally green?
Whereas the tops toward the centre of your tent are yellowing?
What is your light source?
Canopy temps?

Tbh i think it could do with some plain water as well.

Ph of your media?
Ppm of your feed? How often?
What type of medium?
Watering how often?

Could be a few things.
It doesnt immediately look like iron deficiency.
Looks either under, or over nuted/salty.
Or ph issues.
Or both.

Need more information.

:peace:
Click to expand...
I tried to bring this thread back alive because I was searching iron and Mn defs out of curiousity but maybe Growes73 is checked out. Plants don't look too bad but yeah I see an what I've felt is an early over nute sign
 
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