Yellowing starting to occur: week 4 flower

Im not sure what could be the cause of the yellowing, I follow a basic feeding schedule , all my nutrients I use are advanced nutrients; 2ml/L sensizyme & carboload, 2-3ml/L bloom A&B , am I doing something wrong ? I don't like the fact that all the leaves are starting to look like that . Any suggestions would be great. Thanks

Looks like potassium deficiency or lockout

Nixs said:

Looks like potassium deficiency or lockout

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What makes you think lockout? from my understanding the plant is up taking the watering well

Ganjamon876 said:

What makes you think lockout? from my understanding the plant is up taking the watering well

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It could be either a deficiency or a lockout, I'm not that expert

Nixs said:

Looks like potassium deficiency or lockout

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I agree, lockout.

You can take a look here and see

PadawanWarrior said:

I agree, lockout.

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What causes K lockout? Low PH , too much Ca, what else?

Nixs said:

What causes K lockout? Low PH , too much Ca, what else?

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All those. My guess is pH though in this case.

I would say overfed rather than deficiency or lockout. They might be under too strong PPFD expressing it like deficiency also. I would dim or raise your light, skip bullshit and go just base nutrients.

Nixs said:

You can take a look here and see

How to fix Cannabis Potassium Deficiency (K) Pics & Symptoms

Leaves with a potassium deficiency have yellow, brown, or burnt edges and tips. It may look like nutrient burn, but the leaf margins also turn yellow.

www.growweedeasy.com

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Okay thanks !

Overfed on nitrogen tips only brown, curling back, darker green than should be, lay off nitrogen and bump K up, check ph