Any ideas what this is

[lljusell]

I'm a newbie and have been looking thru the interweb trying to find out what's causing it but it looks like it could be 2or3 things

They been getting this on n off thru the grow

Thanks,peace ️


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[NuttyProfessor]

needs CAL/MAG

 

[Lazarus13]

Definitely looks like Ca deficiency. I see LED light in your pic and i have had to up my doses of Ca/Mg since switching to leds.

 

[lljusell]

I picked up a soil ph tester yesterday and the soil is ph 3.5 and i'm watering them with de-ironised water,is this a problem and if so is there anything else I can do in this late sage of flowering?or just still get the calmag,I have them in Mills Dna soil with cork,im week 6 and a half into 12/12 switch,apparently of a 7-8 week flowering,but they need another 2-3 weeks or so.


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[Lazarus13]

Low ph could be locking out Ca. I dont have my chart handy on what is taken up at what ph but i know my ph dropped to the 4s and i got big calcium problems.

 

[Oregonash]

Wow on the soil ph. Most soil grows are 6.3 to 7.0. I bet half of anything you try to feed them is locked out. I keep mine at 6.5 to 7.0 using alittle domolite lime to act as a buffer.

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[The Germinator]

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[Oregonash]

Ops, I guess my 7.0 is to high. Nice chart.

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[Bobbyball]

That's definitely cal Def.. You're early in flower so a spray of cal/mag won't hurt.. Plus its a quicker fix than feeding it through the medium..

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[lljusell]

I picked the girls up some calmag today,a little late into flower I know,they may get a couple of feeds in before harvest


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[lljusell]

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