Week 5 flower, Nute burn or deficiency

Hi, first time posting here I read the Nutrient deficiency/abundance thread and it didn’t really answer my question. Strain is Jack Shit (Jack Herer x Mr Nice Shit) week 5/9. coco perlite medium in 3 gal fabric, plant was clawing like crazy a week ago, it has started to recover, just wondering why the leaves still seem to be burning? Is it k deficiency? Been on straight water for 2days, was being fed canna Flores A/B at 30ml per 10l. Pics below:

Have you flushed your plants?
Did you transplant prior to flipping into flower? If so when?
What are your pH levels when adding nutrients and what is the run off pH sitting at.
what is your RH?
do you run any enzymes?

Rh between 45-55, ph of the plant said was 4.8, Has been flushed for a few days with just straight water, last ph check it was 5.4 after fresh water. it is in a 3 gal fabric in tray, hard to test run off without overwatering, I will never use 3gals or fabrics again I just want to know if it’s fixable by harvest time in 4 weeks, no enzymes. Temps 24-29c lights on.

And yes it was transplanted during the second week of flower as it was a new strain to test vigor and herm traits, it has roots poking out the side of the fabric, I wonder if the lights are burning them????

Dudewhogrows said:

Rh between 45-55, ph of the plant said was 4.8, Has been flushed for a few days with just straight water, last ph check it was 5.4 after fresh water. it is in a 3 gal fabric in tray, hard to test run off without overwatering, I will never use 3gals or fabrics again I just want to know if it’s fixable by harvest time in 4 weeks, no enzymes. Temps 24-29c lights on.

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That P.h is too hot !! Flush that girl with a desalting agent as well.. a good one is from botanicare clearex
buffer it up to 5.8-6.5

The damage is dealt but the grow is still good you just don’t want a continuation of the problem..
Feed P.h balanced nutes, makes sure run off is in range after the feed is in.

Cannablitzz said:

That P.h is too hot !! Flush that girl with a desalting agent as well.. a good one is from botanicare clearex
buffer it up to 5.8-6.5

The damage is dealt but the grow is still good you just don’t want a continuation of the problem..
Feed P.h balanced nutes, makes sure run off is in range after the feed is in.

Click to expand...

6.5 is a little high for coco. I try to stay spot on at 5.8 and range to 6.01. You start getting lockout above that but I will allow mine to hit 6.1. I never bother to pH run off. I only worry about what I put in and every 2 weeks I flush a low osmolar solution through (250ish range) to leech any retained salts. Even if you feed parsimoniously the plant only takes what it needs and leaves the rest so you can get build up.

But I think you called it. If he squares away his sour pH he still stop locking K out.

That makes a lot of sense as it’s in a 3 gal fabric I’ve been lazy not picking the pot up when the first layer of coco was dry, thinking the whole pot was dry I’ve been continuously feeding it and it must have built up quite a bit of salt, I have a question as well, this is the first time I’ve bothered to test ph in 3 years of growing in Coco with Canna and the first grow I’ve ever had problems, how long is it recommended to wait until feeding after adjusting the ph? I have a feeling I’m not waiting long enough and the reading isn’t correct.

I have also been flushing the plant the last three days or so with tap water, my water ph is 6.5 naturally so I didn’t bother adjusting.

curious2garden said:

6.5 is a little high for coco. I try to stay spot on at 5.8 and range to 6.01. You start getting lockout above that but I will allow mine to hit 6.1. I never bother to pH run off. I only worry about what I put in and every 2 weeks I flush a low osmolar solution through (250ish range) to leech any retained salts. Even if you feed parsimoniously the plant only takes what it needs and leaves the rest so you can get build up.

But I think you called it. If he squares away his sour pH he still stop locking K out.

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I see thank you for the insight. I’ve never ran coco.
rDWC and soil are my hobbies.
Hence the 5.5(5.-6.5 flux in ph.
I let mine go as low as 5.5, but as you know different beast.

curious2garden said:

6.5 is a little high for coco. I try to stay spot on at 5.8 and range to 6.01. You start getting lockout above that but I will allow mine to hit 6.1. I never bother to pH run off. I only worry about what I put in and every 2 weeks I flush a low osmolar solution through (250ish range) to leech any retained salts. Even if you feed parsimoniously the plant only takes what it needs and leaves the rest so you can get build up.

But I think you called it. If he squares away his sour pH he still stop locking K out.

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And thank you for the info on coco I always had a feeling it was 5.8 to 6 as that is the best results I have ever had when I tested ph on my first grow in coco!

This pic is the exact same cola two weeks ago, so something has gone wrong between then and now but it’s still growing, just want to be able to harvest it.

I can actually see a slight k deficiency starting even then, will give it a dose of light nutrient tonight phd to 6 and see how it goes after reading the feedback I’ve been given as I’ve already been flushing it on straight water, thanks for your help guys.

Cannablitzz said:

I see thank you for the insight. I’ve never ran coco.
rDWC and soil are my hobbies.
Hence the 5.5(5.-6.5 flux in ph.
I let mine go as low as 5.5, but as you know different beast.

Click to expand...

Yes I ran NFT rails first and when I did I measured my run off lol ie reservoir daily. You called it for him, well done

gave her a litre or so of phd light dose nutrient phd to 6, 4 weeks flower left, hopefully she climbs out of it will post pic in few days.