Enter the Wu

[wutang]

I'd say you've got an advanced iron deficiency. IV experienced it twice , starts with yellowing of new growth creeping down the plant.

Sequester seaweed with Iron works a treat

Cheers mate. Looking at these deficiency charts it seems to be pointing for to a magnesium deficiency as I have the brown spots on leaves too?

[wutang]

I should have post3d this yesterday before they started to curl up. These were the impaxted leaves. They seem to have darkee/black blotches..but no idea if that's because I chopped them out about 12 hours ago.

Also the yellowing may have been due to lack of nutrients when she was hungry. I've upped the feed again and will monitor...but not 100% still about the blotchy leaves

[wutang]

Mine seems to point to a Phosphorus deficiency according to th3 chart above...which kind of makes sense as she's the most advanced plant out of the 4 and I've potentially underfed before.

[Herbalist]

Think you found your problem mate. Best of luck.

[wutang]

Looks similar to mine
Im assuming mine is a calcium deficiency based on this.......https://www.growweedeasy.com/cannabis-symptoms-pictures
Hope it helps in pinpointing your issue. I cant give any suggestions for fixing as i know pretty much zero about coco.

Yours looks very similar too mate...so it could be the same? I put pk13/14 in ydays fill up too so hopefully this should sort it. The pale green leaves for me probably a nitrogen deficiency and that was either due to lockout or being underfed. I'll see what difference is made in a few days after yesterday's top up. Peace bro and thank you.

[wutang]

Ph has settled at 5.9
Ec showing 1.7
In the res

Hopefully as the trays empty and they drink the yellowing will stop as you can see it creeping on others

[wutang]

I think the feed hasn't mixed well in the other update. Its now stable at 6.0ph and 1.9ec

Can't see any further deterioration..and they seem to have responded positively for the extra feed. The other plants started going pale yellow which indicated less feed initially. So hopefully this higher dosage will stop it. My feed maybe higher than what itsbsuppozed to be but I think they get used to it..so I think I've got to ride it out unless I see heavy nute burn

[Marcus]

Hi Wu,

Have you given the media a good flush through with plain water till EC in is the same as EC out? Sit them on the bog and run a shower head through them set on lukewarm.

Also...

"20l bucket:
80ml a
80ml b
30ml pk13/14
EC total: 2.1
Ph 5.7"

That's a lot of grub for my liking, I'm going to say you've locked them up a bit and the salts may need shifting.

4ml/L A+B and 1.5ml/L PK would do my plants in for sure, I;d be aiming for 2ml/L A+B and at most 1ml of PK per L for this stage of their life. Maybe hold off the PK for another week?

I had nothing but issues with salts in autopots, I dialled them in by using really low EC feeds and got a couple of good results.

They'll get to the finish line alright though if you tread lightly with them.

Good luck dude.

[wutang]

Hi Wu,

Have you given the media a good flush through with plain water till EC in is the same as EC out? Sit them on the bog and run a shower head through them set on lukewarm.

Also...

"20l bucket:
80ml a
80ml b
30ml pk13/14
EC total: 2.1
Ph 5.7"

That's a lot of grub for my liking, I'm going to say you've locked them up a bit and the salts may need shifting.

4ml/L A+B and 1.5ml/L PK would do my plants in for sure, I;d be aiming for 2ml/L A+B and at most 1ml of PK per L for this stage of their life. Maybe hold off the PK for another week?

I had nothing but issues with salts in autopots, I dialled them in by using really low EC feeds and got a couple of good results.

They'll get to the finish line alright though if you tread lightly with them.

Good luck dude.

Hey bud

Thank you for dropping in. That feed at max level was to level out the very weak feed in the tank already..the overall ec is now sitting at 1.9 and pH 6.0.

I think the problem is that I ran too high from the beginning, so my theory is that if I drop back too much now, they'll starve. The most advance plant started to look hungry and I thought it was a lockout...as the others were nice and green but they were about a week or 2 behind as they popped late, so naturally they wouldn't be at the stage where they started showing deficiencies.

When I dropped to 1.4ec which I now realise was too low..they started going yellow and the advanced plant started getting worse too.

I checked in yesterday and I think things have settled and they've definitely been drinking a lot by the looks of the reservoir.

I'll check tonight to see if they've got worse.

It's tough bro trying to flush them. I'm in a garage close to neighbours lol. The buds are still fattening up.

I'm on week 6...so next feed should I drop the PK now @Marcus

I appreciate everyone's help on here..forever grateful.

Cheers brother.

[Marcus]

I'd run pk till you feel it's time to flush if you are going to flush that is, or until chop.

Some folks run pk all through flower, some in the final weeks... It's whatever suits, but when running pk there's no way I'd be able to be at at 4ml/L of A+B, they'd just burn to a crisp.

Did the plants yellow up from the top down or the bottom up out of interest? I've had plants that have been yellow from week 3 and have got to the finish line ok, just a bit yellow.

In my mind (as simple as it is) if they yellow from the top down, that's lockout, bottom up and that's not enough grub as they start eating the lowers 1st to push into the new growth up top, which will also yellow up if I don't up the ferts.