HELP! Leaves yellowing and curling

[YYCannabis]

One of the girls is showing some signs of trouble. What is causing this? and how do I fix it?

-DWC hydro
- still feeding veg nutes
- 8 weeks old
- humidity between 50 & 60%
- pH approx 6.2

See pics

Cheers
yyc

 

[Tersky]

Could be https://www.growweedeasy.com/cannabis-plant-problems/phosphorus-deficiency. have you switched to 12/12?

 

[YYCannabis]

Tersky Thanks for the link. That might be the issue. The link mentions red stems which all 4 ladies have which I had thought might just be normal to the plant (Big Bang autos).

Lights are in a 18/6 schedule since they are autos.

I did a fresh water change (ph’d and nuted). I’m wondering if I’m not adding enough nutes since I’m feeding at 50% of the manufactures recommend dose.

I should also note that she has tiny pre-flower buds with pistils just showing, so flowering should start soon. Should I add a small dose of flowering nutes to the solution to help bring up the phosphorus?

 

[Tersky]

Yes. ASAP!! When the pistols start showing then it is in fact flowering and needs it's flowering nutes. Give it bloom nutes according to recommended dosages.

 

[Rj420]

I had the same problem before with burnt ends and tiger stripped leaves. I also noticed some discoloration in my roots during a reservoir change. I bought some stuff called orca microbes. It’s kind of expensive about 35$ but it only took a week for my roots to double in size and be pure milky white and in another week no tiger stripes or burnt tips on my leaves. I only use 1.25ml for my 4gal reservoir so it will last a long time.