Is this a calc issue or something else?

Day 1 of week 6, auto skunk#1, under 400w led COB.

11L pot, bio bizz lite soil, 40% perlite. Using all bio bizz nutes / boosts

Good quality tap water sits 24hr at 7.8pH, I ph down to 7.2 with appe cider vinegar (per bio bizz instructions, soil will buffer, apparently), run off 6.5ph

Half strength
Week 1-2 root juice
Week 2-3 bio grow, bio heaven, bio alg-a-mic

3/4 Strength
Week 3-4 bio grow, bio heaven, bio alg-a-mic
Week 4-5 bio grow, bio, heaven, bio alg-a-mic, and introduced half strength bio bloom and bio top max
Week 5-6, same

Feeding with every water.
Watering was slow to start, once week for first 3.5 weeks, she's drinking a lot quicker now though, every 3-4 days.

What started as one or two leaves now 7 or 8.

Ideas? I am leaning towards calcium from pics I see and understand common with led grows.

Humidity around 40-45%, temp 80%

I haven't had proper fan circulating, I have intake / outtake, and putting two clip fans in tomorrow. So possible residual leaf moisture the cause?

Anybody?
It's spreading and leaves are getting more pale having been a rich dark type of healthy green before

Gave a feed 2 nights ago with increased heaven, bloom and top max which should add more Cal-mag but looks worse.

Flush???

LouixFrenchton said:

Anybody?
It's spreading and leaves are getting more pale having been a rich dark type of healthy green before

Gave a feed 2 nights ago with increased heaven, bloom and top max which should add more Cal-mag but looks worse.

Flush???

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Yes flush asap. You prob have nute lock and it looks more like a phosphorous issue not calcium. She doesn't need as much calcium as ppl think. But since she's flowering she needs a lot of phosphorous, also could be a PH issue. You need that PH at 6.5 for real. unless your in compost anything more than 6.8 can be dangerous for an already sick plant. Try checking your run off. If its close to 7 then flush her with water that is about 6.2. And flush means flood her for a couple days during the day nothing at night. After flushing for a couple days check the run off again then let her sit and dry out some before giving nutes again, she'll bounce back but flush now.

Nugs1 said:

Yes flush asap. You prob have nute lock and it looks more like a phosphorous issue not calcium. She doesn't need as much calcium as ppl think. But since she's flowering she needs a lot of phosphorous, also could be a PH issue. You need that PH at 6.5 for real. unless your in compost anything more than 6.8 can be dangerous for an already sick plant. Try checking your run off. If its close to 7 then flush her with water that is about 6.2. And flush means flood her for a couple days during the day nothing at night. After flushing for a couple days check the run off again then let her sit and dry out some before giving nutes again, she'll bounce back but flush now.

Click to expand...

Hey

Thanks, really appreciate the reply.

I have been leaning towards phosphorus myself, but some leaves look more ca-mg, some phosphorous. Maybe I have a bit of a mix. My soil is bio bizz lite, so not rich in nutes.

I am tempted to try a cal mag boost before flush, as understand flushing can be quite shocking for the plant, I am not sure we're in drastic stage yet although something needs to give in next week.

I am only using organic bio bizz stuff at half strengths. Maybe introduced bloom a bit late, she's only had two feeds of with flowering nutes (those in last week) , but I am feeding every water be it starting 1/4 building up to 1/2 strength.

I don't seem to have a PH issue, although I am going to check it having only just got calibration fluids and there has been a potential red flag.

My tap water is between usually 7.9-8.1 in ph and not particularly hard and pretty much the best quality tap water in the world, literally! After all organic nutes added, I was using drop of apple cider vinegar to bring ph to within 7-7.3, let soil buffer rest. As I upped nutes, pH has been within range and not needed vinegar. Run off always been 6.5-6.6.

Last two feeds ph of tap 8.6, I have assumed calibration out of whack a little as confident not that high. Thus I been adjusting for 0.4. Run off was 6.9 which is in line with my out of whack calibration logic.

So ph seems fine, will confirm with calibration fluids today how out of whack I am. But brand new digi pen!

Organic bio bizz nutes never been at full strength, but are fed every water.

Not sure if to go heavy on bloom with added camg boost, go lite with no feed for next two waters, or flush.....

She was drinking real slow first 4 weeks so watering was once a week, but it's every 3-4 days now

I give her 2-3 liters a time, 11l pot, gave her 4l last feed 2 days ago and think was bit too much

Seems mostly the older leaves losing colour or marbling.

I see purple stems too, which supports phosphorous issue.

Flushing isn't as bad on them as it may seem but really any change in the norm is stressful. I will say that you can do a light flush to try to help out. Also with your feeding you may wanna back off a bit I would do feeding every other watering. Your probably loading up not eh nutes, causing a cal mag lock.
Personally I'd flush maybe a light one and then Half the nutes for the next 2 feedings then back to normal. Now with soil it will take at least 3-4 days before you see a difference so don't freak if you don't see anything. Good job with the PH though. Most tap water is about 7.5-8.2.

OK, so calibration reveals ph meter likely out from the off. Was 0.6 +, and my tap water is closer to 7.5-7.6.

This means everything has been slightly more acidic than first thought, though within respectable ranges I.e. Feeds have actually been 6.7-6-6.8 and run off 6.3 instead of closer above and closer to 7 respectively.

I have attached the schedule I'm following.