Is that phosphorus deficiency? Could anyone identify the deficiency?

[greenbliss]

Could anyone identify the deficiency?

Today I watered them with BAC PK Booster and a tiny bit of BioBizz CalMag

 

[Imzzaudae]

Welcome to the forum.

The yellowing along the side leaf points is light burn.
She is growing closer to the lights.

Burned leaf tips:
This is a sure sigh that salt / E.C levels are running a little high in your medium.
Your over feeding. Not a lot but it's showing.

 

[N1ghtL1ght]

Yo, easy on the PK.

 

[greenbliss]

Welcome to the forum.

The yellowing along the side leaf points is light burn.
She is growing closer to the lights.

Burned leaf tips:
This is a sure sigh that salt / E.C levels are running a little high in your medium.
Your over feeding. Not a lot but it's showing.

many thanks for the answers

I doubt is light burn

I do believe is potassium deficiency :: my error before when writting phosporus deficiency

over feeding... I do not really think so, I'm more into underfeeding

 

[Redneckx]

many thanks for the answers

I doubt is light burn

I do believe is potassium deficiency :: my error before when writting phosporus deficiency

over feeding... I do not really think so, I'm more into underfeeding

Welcome to the Farm!
Is that your first grow?
Most of the people here are really experienced in indoor, outdoor gh an commercial grows!
I'm not one of them but as hint give them an opened ear, they know what they're talking about. Less if often more! Light & nutes.

 

[greenbliss]

Welcome to the Farm!
Is that your first grow?
Most of the people here are really experienced in indoor, outdoor gh an commercial grows!
I'm not one of them but as hint give them an opened ear, they know what they're talking about. Less if often more! Light & nutes.

no, it's not my first grow

I do know is not light burn for the distance of the plants with the light and because I got light burn in the pass

yes, I do know there is always EC imbalance possibility

Yet lately I had been underfeeding to solve a surplus of nitrogen (and probably that's why they started to show potassium deficiency). Even when I hadn't feed that many to them, I applied insect prevention and I do believe that's what created the nitrogen excess, or maybe because applying to much

also I realized some calcium spot in one of the leafs, and I started to add a bit of CalMag since I water with filtered water

PH level is good, EC level I do not know since I do not have calibration solution right now, hence not using the EC meter

 

[greenbliss]

I'm adding a new photo

as written before we can sort out burn light