HELP! Leaves tips turn yellow during Flowering stage

[isaackei]

This plant has a history that suspect nutrient burn (looks like nutrient burn but never get confirm). I change the light hours to 12/12 at Oct 27th, so it is near 3 weeks old in flowering stage.

I have spoted the leaves edge get yellow spot, some of them have already happen before flowering stage, but some happens after flowering stage. I am not sure is it a Potassium Deficiency? or nutrient burn in the early age or it just a normal thing to happen.

Because i am not sure what causing it, so for the past 2 weeks, i only water it, without any fertilizer. it is hard for me to identify what is going wrong, because the yellow spot just not increase the size or kill the leaves, but more and more leave are getting those yellow spot at the edge of the leaves.

so if anyone who know this, or have any idea, please let me know, and i am very appreciate. thank you

My setup:
a LED light with 600W (far enough from the plant)
a grow tent (big enought for those three plant)
fertilizer 'Foxfarm' whole setup
i use soil for growing.
and fan for intake and fan for outtake.

[isaackei]

OW, am i post it in the wrong place?

[Canyon Grower]

You are in the right place. I dont know what this is, but someone will and will likely answer you.

[isaackei]

Thank you Canyon.

[GRAND]

It does look like nutrient burn, however u said u stopped nutes 2 weeks ago. So I was thinking, cause your in flowering, could it be cal-mag deficiency? !? Maybe look that up in the symptoms checker. I hope this helps a lil, and Good luck buddy!

[GRAND]

The plants look great, aside from the burnt tips. Those budsites in the 1st pic, reminds me of constellations!

[isaackei]

Hello Grand. thank you. This is my first plants grow also my first time growing a plants. and there are still so many thing i have to learn. my plants looks like constellations could be the reason that I first experience topping and FIM. I learn a lot after that. and just a few moments ago, I learn a another thing call Defoliation. wait, not a good idea to defoliation in flowering stage right?

[Mr.furley]

Hey isaackei,
What is your in and out ph? What kind of soil????? and how much FoxFarm did you give, in what schedule?

[isaackei]

Yes, my the fox farm 'grow big' concentrate is 6-4-4. And it is a small pot with one gallon only. I have a question when doing flush, should I keep water it slowly, in the mean time, let water runing out untill the PH higher than 6.0??
thank you.

[Mr.furley]

Ok there is 3 or 4 different feeding schedules for Fox Farms so which one are you using do you have a picture or can you tell me your mix and the last time you fed?
Yes if you flush water it slow! but give it a lot if water, enough water to change the pH whatever it takes. I think you should target to hit 6.3Ph.
But first your feeding schedule as mentioned above

[isaackei]

The title is: Soil Feeding Schedule. and the last time i was following weeks 12.
and I make a translate, I think the schedule is showing tsp/gallon. and normally I don't need that amount. so I use 1.5(L) of water = 0.4 gallon. In the schedule shows 3 tsp, and i will translate to 3*0.4=1.2 tsp. and so on. and I will keep the PPM in between the recommand rang.
after mix the nutrient, the PH would be aroung 4-5. and next i will rise the PH to 6.0 to 6.5.
But it looks like it still burn the plant.

There is one thing i did not follow and have not try it yet. there is one blue line in the schedule between weeks 4 and 5, weeks 7 and 8, weeks 10 and 11. it said: " SledgeHammer flush: 2 tsp/gallon of water." I thought it is not important so i did not do it. is that how i mess up??
Picture down below

[GRAND]

@isaackel I don't normally defoliate when I'm in flowering, Unless the plant gets too close to your light source. I don't wanna burn the plant! Yet that is LOL!

[isaackei]

this is the schedule i am using