Deficiency or heat damage?

Hey everyone!

I have a Nebula sativa plant from paradise seeds at 53 days flowering. The past 11 days it has been in the care of someone else as I have been away. When I got back I noticed some of the main fan leaves had completely turned brown and brittle, but only on one of the main colas. The mix is soiless with half perlite half organic 'potting mix'.
They havent been fertilized in 12 days because I read that you dont fert in the last 2 weeks so the plants can use the nitrogen in the leaves or something like that. Im not sure if that is the case with soiless mixes though? They were getting fed chalie karp fish emulsion. The ratios are N 9 - P 2 - K 6, i know this is not an optimal flowering fert but it was all I had access to at the time.
The lights are a 130w cfl with a fan blowing on it and a couble of 25 watters in the gaps. They had grown quite close to some of the lights but im not sure if it was close enough to do the damage to the leaves in the pictures. Also could this be the fan leaves naturally dying in the flowering process?

If someone could have a look at the attached pictures and give me some feedback it would be greatly appreciated! Also how many more days the plant might need before harvest, im a bit rusty on this type of stuff...

Cheers!

As seen in figure 10 consumption of nitrogen (N) from the fan leaves during the final phase of flowing is 100% normal.

Do you think it is becuase of Nitrogen consumption? Why has it affected only the leaves of the main cola??

you're almost home.....don't do anything. unless it effects bud. one gardener's opinion. you're in a solid medium, i would think you have N in there.
and.....ph? how's that?

PH is at 6.3 Yep im going to harvest in 3 days. I dont think I will stress too much, the buds look fine! Would have liked to know what happened to them though...

Looks like a simple P deficiency to me, but otherwise beautifully healthy looking plant from those shots. Do the same thing you did here next grow except maybe alternate in some 10-30-20 when she's blooming. No reason to radically change things next time, she looks great.

N deficiency shows as even leaf yellowing from the bottom of the plant.

That looks pretty normal to me for a plant in it's last week or two. If there is an issue it looks like it's heat related to me. Not nitrogen for sure.

Thanks scratchme and ghetto grower! I'm pretty sure its a deficiency because they havent had nutes for 2 weeks. I think I backed of the fertz a little too early being a soiless mix. There was some light burn on one of the other plants though, I just learnt that while i was away the plants grew towards and were touching and my carer moved them away. This one went surprisingly well too considering it was on the outskirts of the lights, only the main cola was under the big lamp. The other 2 were from the sativa champions pack, the delahaze was the standout but the jacky white was a dud. This one is getting all the lumens in the next grow!!

plants look good. looked like light burn on the one cola. I always stop nutes 2 weeks prior to harvest and actually water them with a little molasses in the water to sweeten up those buds and it also provides carbohydrates for the plant to fatten up those buds. just my theory. Btw love the name. I have a strain that I call rumpleforskin!!!! lol