Day 35 . Nute burn or PK DEF?

[Roperunner420]

Okay guys need some feedback. 4x8 tent 1600w w/co2 and a window shaker. Strains are cookies n creamxfirecookies and a banana kushx?? Tester. The ladies are in 2 gallon fabric of coco chunky perlite 50/50 mix. Nutes are emerald harvest at 1000ppm it's currently day 35 of flower. Is this nute burn or potassium/ phosphorus def?

 

[Roperunner420]

Any help would be appreciated.

 

[Chevy cHaze]

Hey Roperunner420,
That looks like a potassium deficiency in my opinion.
I see this in my garden a lot, as I'm growing in organic living soil with no extra fertilizer added.
Cookies... so you're halfway thorugh flowering roughly ?
Honestly I wouldn't do too much...you could use A LITTLE BIT of something fast acting like liquid kelp or anything with a good amount of K in it.
OR try making a tea with bat guano and kelp meal or liquid seaweed (for the K).
But in two or three weeks time you'll probably start flushing anyways...so... might as well let them fade out nicely after one little dose of anything K that acts fast.

Kush: I'd just let it fade out nicely, that one is probably harvested a bit earlier.

Have a look at the thread "Complete guide to sick plants..." by MyNameStitch for future problem identification and solutions:
https://www.icmag.com/ic/showthread.php?t=11688

Good luck!
CC

 

[Roperunner420]

Thank you for your response, it is greatly appreciated. My next question is wether I should first try to adjust my ph of the feedings. I have been ph to 6.1-6.2. The thread you suggested said k is more readily available under 6.0. So possibly down to 5.8-5.9? Also the supplement i have to the emerald harvest line is a potassium silicate. Which I have not been including on any flower feeding. Would that be sufficient and safe to feed this late into flower?

 

[Chevy cHaze]

Give her a little bit of the K, and adjust the ph to 5.8 is my suggestion.
You're not far off even with 6.2 just adjust it back to 5.8 which is what I have always adjusted to when in coco with chem nutes, you'll be fine
CC

 

[Roperunner420]

Okay so my next related question, after doing some research I read that over feeding calcium in flower can cause a K deficiency. I have been filling a 13 (figure 12 to 11 gallon of solution) gallon garbage can as a rez and mixing nutes for 8 gal. Including cal mag @5ml/gal. How likely is that to be the root of my problem? Thanks for your help. My game plan is cut the calcium and up the K. Adhljust the ph a bit like you suggested as well.

 

[maimunji]

Pk def nute burn looks simular but in your case im almost sure its nute burn. Very possible with this high doses 1000 ppm. How much watering per cycle? K def start at the bottom and work up with blotchy spots and some yellowing not always but its classic.

 

[Speed of green]

I'd say burn, the leaf tips are shot and the def normally starts in the middle or the edges of the leaf leaving the tip green.

Exactly as maimunji says the def will start at the bottom and go up, the burn will hit the tips first and spread from there.

1000ppm @ what scale? 500-700?

Those are good size plants for the 2gal pots, I'd make sure the coco isn't drying out, with the high ppm feedings the salts build up quick if the pot drys out too much

I would check your runoff PH and PPM this will tell you if there is a buildup of nutrients in your pot leading to the Burn.

Get back to us with the numbers when you can.

Good luck!

 

[Roperunner420]

Just saw the reply. I did take maimunji advice and I flushed with 30 gallons of ph 6.1 water with flora clean. And fed them at 700ppm. My meter is Hanna scale I believe. I need to check for sure. The coco had dryed out on a few occasions. I also think still feeding cal mag (has nitrogen) and I was feeding every water. Twice a day. I have since been feeding every other water. They are now on week 8. A couple phenos are foxtailing (in the not so bad add on weight kind of way) Lots of clear trichs still. This is my second go round first in coco. As for run off I didn't bother to check assuming it was off any how. I'll check next water. I have one plant next to the dehumidifier that days out every time. My next run I will not mix 5050 perlite that's for sure. Thanks for the input. You were spot on.