Is this Mag or Phosporous Def?

[RollerofDoobs]

Ok so I first diagnosed my plants with a Mag def and hit them with some epsome salt and extra MagiCal. But one of them has very purple stems so it's making me think phosporus, I just hit them with 1/4 strength tiger Bloom though. I checked run-off pH a week ago and it was 6.6 on my pH meter. I will check it again later on today or tomorrow. Anyways here are a few pics, any help is appreciated.

 

[realcarlos]

Sorry nothing to add just wanted to say I'm having the same issue

 

[agito]

It looks like mg if you dosed with mg consider that problem ruled out and do not redose, its obvious but a hit of N/grow formula would not go a miss
yellowing leafs 99% of the time can be put down to mg/N or lock out due to adding to many random things or ph

 

[The Medicine Man]

Looks like potassium def to me.

 

[JM]

i thing MG and potassium.. let the mg ride since you added that.. maybe another 1/2 dose of tiger... but make sure ph stays cool... tiger can swing you low fast!!!

 

[RollerofDoobs]

i thing MG and potassium.. let the mg ride since you added that.. maybe another 1/2 dose of tiger... but make sure ph stays cool... tiger can swing you low fast!!!

I know! 1/2 tsp per gal dropped it to 3.7! It took like 2 tsp of pH up to get it back to 6.4. JM do you have that graph of which nutrients absorb best at certain pH's? I seen you post it a few times in the past but I cannot find it anywhere lol.

 

[RollerofDoobs]

So I checked my run-off pH today and it was not at all where I would like it to be. Plant 1- 5.9, Plant 2- 6.0, Plant 3- 6.1, Plant 4- 5.8, Plant 5- 6.0, Plant 6- 6.0. I know this is too low and I am going to try and raise it a bit by a flush with 7.0 pHed water and then maybe top dressing with some dolomite lime.

 

[mr.mcgregor]

how old are your plants? can you add a full shot of them. is it just the lowest fan leaves that apear to be showing deficancys? whats does any new growth on your girls look normal?

 

[RollerofDoobs]

Plants are in week 5. Yes the defficency is only showing on the the bottom fan leaves. The new growth seems fine to me. Here are a few pics for now but they are from about a week ago, I will get a better shot in a few hours when I get home.

 

[sparky954]

just wanted to say that the bottom leaves brown on the edges if they touch the pot for some reason.all the leaves on my plant that were touching all did that . don't know if your leaves r touching the pot or not?