What's wrong here?

[Bluegrass420]

Any idea of what is going on with my friend's plant? Any specific advice is welcome. Thanks!

[The Lorax]

Is that a fungus?

[Bluegrass420]

No I don't think so. The fan leaves are yellowing and turning brown. They also seem a bit brittle. She is using Foxfarm Organic Ocean Forest Potting soil with GH Hardwater Floro Micro and GH Florobloom for nutrients. PH is kept at around 5-6. I suspect it is about 5 or 6 weeks (maybe more?) into the 12/12 cycle. She has a 450Watt HPS and the plant is about 12 inches below it. I thought maybe at first it was too close to the light but the fans keep it pretty cool.

[stinkyattic]

pH is WAY too low, get it up to at least 6.5, and it looks like you have a calcium and /or Potassium deficiency or lockout... I am going to guess lockout caused by shit pH.

You say you're in soil, but what are those rock wool blocks I see? pH 5 would be for HYDRO... ???? Now I'm confused... your "friend" should post and explain herself... :D

[freewheelinfrank]

potassium (potash) deficiency - (the last number in your ferts percentages) - you can use wood ashes and water, for fast fix, however, it's not really critical - (tends to be more cosmetic than anything) - your leaves yellow and die during later flower stages, the plant is dying, and throwing all its energy into flowering, for survival - and, as Stinky said, your pH is too acidic - :jointsmile:

[Bluegrass420]

My friend is my girlfriend. She doesn't have a camera or computer so I told her I would post this for her. Fixing the PH should be easy enough. The reason for the rockwool is that she has a couple of bubblers going too. Apparently the giant rockwool cubes make good plant stands cause they are way too big unless you are growing a tree. Is it too late for the plant in the picture or should she flush it with a 6.5 PH nutrient solution?

[percy*green*fingers]

I,ve had a similar problem in the past, Get some canna mg additive (epsom salts). I'm pretty sure this will cure the problem. Good luck:jointsmile:

[stinkyattic]

Aaargh it isn't an Mg deficiency. Listen to freewheelingfrank. He's got more experience than most of us.

[sik2006]

seems like those plants are very close to being done, close enough not to feed them anymore, how many weeks in are they?? might be time to go

[sik2006]

nevermind oppps haha just noticed the date this was posted

[Tomthehippie]

lol :D