WTF Plant turning yellow - Leaf edges turning orange/brown

[Kaiju]

Happened after feeding pH perfect Sensi Grow

all apart from 1 plant have showed similar features to the orange/brown edge almost like nute burn. The 1 plant that has only shown it on really old lower leaves has grown real big and nice.

My only thoughts are the 1 that's grown big and nice is a little hungrier and had less nute build up in the soil and the rest were a bit picky

The yellowing on this one in particular looks like iron def

 

[swampman]

My npy.thoughts Would Be u locked Her out ..
Theres should.Be some solid help along Shortly

 

[GoAuto6]

looks like a mag deficiency, what medium are you using pro-mix? the reason I ask is... soil less medium tends to need a lot more cal-mag


might try a folior feed with Epsom salt.... Hows your PH

Rough Calculation Guide:

Here's some good info on ph.....
If your runoff pH is higher than your starting pH, use this equation to determine your soil pH:*
Soil pH = Runoff pH + Difference

If your runoff pH is lower than your starting pH, us this equation:
Soil pH = Runoff pH - Difference.

For example, say your the starting pH of your solution before it goes in is 6.5 and the pH of your runoff is 7.0. The difference is +0.5, so using the above equation:
Soil pH = 7.0 + 0.5*
Soil pH = 7.5

If your starting pH is 6.5 and your runoff is 6.0, your difference is -0.5 and using the above equation:
Soil pH = 6.0 - 0.5
Soil pH = 5.5

 

[Kaiju]

Plagron Light mixed with perlite and vermiculite

 

[Alex Delarge]

Before I even opened thought cal-mag, with my limited experience. What is PH of nutrients, and run-off? This is my favorite resource -

Cannabis Nutrient Disorders

 

[Alex Delarge]

Which chart should be used for coco or HP Promix? Moving from hydro, and used to use those numbers.

 

[Grim Reefer]

It looks like Mg to me most autos are very heavy on cal and mg. You need to buy some molasses and epsom salts if you want to tackle it organically or get some sort of liquid mg and cal from your local grow shop and that shoud stop the problem.

 

[Kaiju]

See to me it looks like multiple deficiencies from nute lock but i could be wrong

 

[Grim Reefer]

Its Mg for sure im positive.

 

[Waira]

Hmmm,... I believe it's Iron defn.,.... early signs are very similar to Mg, but with Fe defc., yellowing starts strongest at the top, and progresses downward, as FE is very poorly mobile; Mg is mobile, so the plant will draw on lower leaves first, yellowing then fastest... as for why, i.e., lockout issues, or just plain lacking, we'll need info on your growth media and maybe your fert' choices.... treating with a foliar spray is the way to go here; it's the fastest way to get it into the plant!