Yellowing in middle - auto in soil

Cwmoore577

Cwmoore577

Well-Known Member
I have an auto in early flowering that’s starting to yellow mostly on the fan leaves in the middle of plant.

It’s a strawberry cheesecake from seedsman. It’s in Fox Farm Strawberry Fields soil.
It’s 6 weeks from sprout.
Lights are a 100w output blurple led and a SunSystem HPS 150.
It’s been watered every 4-5 days with mostly RO, a couple times tap water (150ppm).

Last watering (Dec. 7th) I gave it RO water with a low dose of CalMag and BioThrive Bloom (2-4-4) at 320ppm and pH of 6.8.

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MrToad69

MrToad69

Well-Known Member
Lower your pH..6.2-6.5. Getting up around pH 7 or so can cause nute absorption issues...(cal/mag)
I also noticed some some mild clawing...perhaps just a smidge too much nitrogen? hopefully your not overwatering...?
 
Cwmoore577

Cwmoore577

Well-Known Member
MrToad69 said:
Lower your pH..6.2-6.5. Getting up around pH 7 or so can cause nute absorption issues...(cal/mag)
I also noticed some some mild clawing...perhaps just a smidge too much nitrogen? hopefully your not overwatering...?
Click to expand...
I’d say I’m likely closer to underwatering. I let soil dry out quite a bit between waterings. I’ll lower ph and see if it helps.
 
Cwmoore577

Cwmoore577

Well-Known Member
Gotten significantly worse. I’ve fed yesterday with the BioBloom and calmag at 6.25ph, 860ec and 560ppm.
Runoff ph was low at 4.5, with 1500ec and 1000ppm so there’s nutrients in the soil it’s just not taking any.

I’m thinking it could be locked out?
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C

CannaCountry

Well-Known Member
Yellowing fan leaves, especially at this stage of flower, would suggest a need for N
Clawing leaves, while not 100% correlated to a N surplus, are at the very least pointing to a problem (soil)
While I don't believe in checking one's runoff, a pH of 4.5 from your pot is indicating things are pretty acidic in your container
All of this suggest, you may have a problem with your pH...this is exactly where I'd start.

Good luck friend
 
Nutty sKunK

Nutty sKunK

Well-Known Member
Have you noticed it speeds up (the yellowing) when the soil gets dry?

If so you’re letting it get too dry. Imo you gave bloom nutes too early and the unused P/K acidified your soil.

Im growing this strain and just drying one now and it takes a while to flower. Mine took 10 weeks.

I’d leach the medium with pH balanced water then feed a 50/50 bloom and grow. Then after a couple more switch to bloom.

Mine yellowed just like yours at the same time.
People forget that the plant requires N and uses most of it during the stretch. So
You need to replenish it.

Those black spots looks like calcium so it’s a pH issue now since you’ve added some before.
 
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