Help with Calcium Deficiency!

Hey guys,
So quite new to growing here (My first real grow running at the moment)
I Have 4 Autoflower's In their 5th week of flowering now, 3 gallon's in coco coir & running cmh.
was feeding daily with a ph @ 5.8, now I'm feeding @ 6.1. (800 PPM)

Now It appears 1 out of 4 of my plants has developed quite a hefty calcium deficiency. (real bad rust on growth closest to light.
quite stumped as to how or why this would have came about..
I tried Running 15L of Ph'd Florakleen + Calmag through, which dropped runoff ppm to about 300.
And then proceeded to fed normally afterwards, although the deficiency seems to still be going on strong.
any help and suggestions would be much appreciated thanks.

Make sure to add some photos so other people can help you more with what's going on. Cheers

Sometimes excess N will prevent Ca from being absorbed; your plant looks pretty green.

I tried Running 15L of Ph'd Florakleen + Calmag through

Why?

What are your feeding it? Base nutrients, etc...

Using LED and at distance less than 2'?

Shouldn't need Florakleen, it's made for the final flush if I understand correctly. Close led's can cause that look as well. High phosphorous can inhbit either calcium or magnesium, I can't remember which. So it's possible you're feeding too much bloom booster. When in doubt, stick with the base nutes! Of course, sometimes you do just have to add some cal-mag, especially under LED's. But true cal-mag deficiencies aren't really common unless in hydroponics, idk about coco. I'd cut back on your bloom feed at least for now and watch for improvement.

CannaCountry said:

Sometimes excess N will prevent Ca from being absorbed; your plant looks pretty green.

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I dont believe so, just running half strength lucas formula..

xtsho said:

I tried Running 15L of Ph'd Florakleen + Calmag through

Why?

What are your feeding it? Base nutrients, etc...

Click to expand...

I wasn't sure why I had a deficiency so I just thought maybe that could help the situation.. clear the medium abit.

lucas formula + liquid koolbloom @ 5ml/Gal

hotrodharley said:

Using LED and at distance less than 2'?

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Nah man, CMH. 20"

Logan Burke said:

Shouldn't need Florakleen, it's made for the final flush if I understand correctly. Close led's can cause that look as well. High phosphorous can inhbit either calcium or magnesium, I can't remember which. So it's possible you're feeding too much bloom booster. When in doubt, stick with the base nutes! Of course, sometimes you do just have to add some cal-mag, especially under LED's. But true cal-mag deficiencies aren't really common unless in hydroponics, idk about coco. I'd cut back on your bloom feed at least for now and watch for improvement.

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Yeah okay, I knew that but yeah, thanks. I see interesting, thanks for your help man, il reduce bloombooster see how it reacts.

I had the same thing with some (already rooted) clones, showed mag and cal def in soil which had plenty of both.
My problem was that i had too much light (and maybe heat) and not enought roots (even tho the 250W MH was like 60" away).
Also i watered the soil a bit too much before transplanting the clones and this made root development even harder for them.
I reduced the light for a few days and sprayd with some rhizotonic to help develop roots faster and let the soil dry out properly.
A week later they looked healthy af and the MH was back in action.
The Cal and Mag def wont go away on the old leafes tho.
Not sure if this will help you but maybe it does a bit.

Logan Burke said:

Shouldn't need Florakleen, it's made for the final flush if I understand correctly. Close led's can cause that look as well. High phosphorous can inhbit either calcium or magnesium, I can't remember which. So it's possible you're feeding too much bloom booster. When in doubt, stick with the base nutes! Of course, sometimes you do just have to add some cal-mag, especially under LED's. But true cal-mag deficiencies aren't really common unless in hydroponics, idk about coco. I'd cut back on your bloom feed at least for now and watch for improvement.

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ps. 24h later and its only getting worse. Only base nutes fed at 1/2 strength! Driving me crazy

Check your runoff ppm, and ph. Something's outta whack.

800ppm is a fair amount. Ph 5.8 during flower isn't necessarily ideal, even for coco.

You may find your waste's ppm is quite high, or your waste ph is quite low.

I'd start there.

Aussieaceae said:

Check your runoff ppm, and ph. Something's outta whack.

800ppm is a fair amount. Ph 5.8 during flower isn't necessarily ideal, even for coco.

You may find your waste's ppm is quite high, or your waste ph is quite low.

I'd start there.

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Just fed and checked, both are out of whack. fed at ph 6.1, 800 ppm
came out at 5.6 ph, and 1100 ppm, any help on the situation would be great? whats the best way to go about this

Personally , i'd probably set your feed ph to between 6 and 6.5. Ph 6.3 or so, you're in flower anyway.
Less ppms too, maybe 400.
Leach / flush the coir a little, until the ph rises, and the ppms come down.
Then resume normal feeding.

I'd keep the ph of your feeds, around that 6.3 mark, or just below. Ppms you may want to drop from 800 -600 or so.
Just see how it goes.

Aussieaceae said:

Personally , i'd probably set your feed ph to between 6 and 6.5. Ph 6.3 or so, you're in flower anyway.
Less ppms too, maybe 400.
Leach / flush the coir a little, until the ph rises, and the ppms come down.
Then resume normal feeding.

I'd keep the ph of your feeds, around that 6.3 mark, or just below. Ppms you may want to drop from 800 -600 or so.
Just see how it goes.

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Yeah alright, sounds like a plan. 6.3 got it. I know its high ppm, but they have been loving it. will lower it though..
Alright will do... what would cause for the drop? how can I prevent this from happening?
thanks for your input

Nellyitis said:

Yeah alright, sounds like a plan. 6.3 got it. I know its high ppm, but they have been loving it. will lower it though..
Alright will do... what would cause for the drop? how can I prevent this from happening?
thanks for your input

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Not necessarily the ppm. If they're loving it, i'd leave it the same.
But i'd flush with a lighter solution, to bring the ppms down, to where you want them.

A low ph will affect calcium, magnesium, potassium, phosphorus etc availability.

I'd say you just had a little buildup in your pot, and it caused the drop.
Periodically checking the waste, especially if something's wrong, is a good way of prevention.

Best of luck. Should be fine.

Too low of a pH will cause you issues in coco...this is true, but, don't venture too far from that 5.8.

I'm curious as to why you're cutting back your ppm's when from the picture it's very clear you haven't even kissed the tips of the leaves with any sort of burn or over feeding. I'm not suggesting you up your feed, but I don't see where lowering it from what you've been doing is going to help. When you're trying to pin down a problem it's best to leave as many variables the same...small changes, one at a time.

Coco is one of the easiest mediums to reset. If you're worried about your coco being at the wrong pH, ppm level, salt build up or anything else, all you have to do is mix up the proper level of feed you want, pin down the pH you want, saturate the pot / medium with this new mix until you have adequate run off (more so than a typical feed / water situation) and you're all set to go. The medium will then reflect just what you put in and then the race to check your run off is a moot point.

I would still lean towards a Ca issue and if it were me, I'd find a way to add a little without adding additional inputs. Good luck

Be aware that foods high in calcium, such as dairy products, can also be high in saturated fat and trans fat.

Read the parts about fixing fuck ups from guessing....
https://cocoforcannabis.com/