Help with Diagnosis and possible fix

[Papasquat]

I have a single dwc plant going to test out a new led panel i got compared to my usual 600. I went out of state for a few days for a family member passing and when i got back the plant was as you see it.

My guess is it is nute burn cause i raised the ppm's 300 points from 500 to 800 and the ph was 4.9 in the bucket when i got back.

So any input would be greatly appreciated.

Thanks in advance

 

[kiwi_growa]

Heya bro,

I am gonna have to agree with your guess and say it could be nute burn, kinda does makes sense seeing as the only environmental changes there have been in your setup are the PPM's increasing by 300 and obviously the new led panel. How hot is the ambient room temp with the new panel compared to the other and also how far away is the panel from the tops. It doesn't look like light bleaching, but I won't rule it out as I don't want to steer you in the wrong direction.

The darkening in the lower leaves indicates high nitrogen levels which reinforce my suspicions of nute burn, and the light green tops also indicate nute burn along with the curled leaf tips. I'd put my money on Nute burn and give that girl a flush but ya may want to wait for a couple other to chime in before doing that.

goodluck with your problem man! Hope she pulls through. She looks like she will.

 

[Papasquat]

The ambient temp is around 72 and in the tent is about 80 with no air extraction, just circulation on the inside.

The tops grew to less than a foot from the light while I was away. I thought the stretch was over due to flowers starting just after 5 days and the explosive vertical growth was over. I guess it just creeped up a few more inches.

The nitrogen levels are high due to me testing a free sample of "veg+bloom". Its a one part nutrient base but its still pretty high in N for flower

 

[kiwi_growa]

No air extraction.... hmm, I don't like the sound of that. Hope that is not how your tent is setup..

Just coz ya got a free sample doesn't really make it o.k to ive it to your plants if it isn't designed for them. Although in saying that, I know a lot of people who flower with ferts high in nitrogen and swear by it!

my advice - get fresh air in that tent constantly and monitor the nutrients you are giving your girls more often. One mistake with the nutrients can set you back more than a week.

 

[Papasquat]

There is fresh air intake with a day can fan sorta thing I built years ago and there is oscillating air movement inside but just no active extraction. I can turn on a 530 cfm fan that's set up for my 600 but every person I talked to using led lights said not needed unless I'm using tons of them.

I wanted to try this sample out cause I have seen a few threads where people swear by it. I use maxibloom at 7g/gal per the k.i.s.s. method normally and the veg+bloom was supposedly comparable to it but a tad more expensive per amount used.

Being as the plant is 22 days old in flower I think I just shocked it with the 300 ppm jump cause I expected it to be done transitioning into flower.

Since no new growth is gonna happen should I defoliate the problem leaves? Majority of them are fan leaves not connected to bud sites for feeding but some are.

Thanks again

 

[kiwi_growa]

Defoliate the leaves which are dyeing or look like they're on there way out. Keep all other leaves on. Keep in mind it isn't just the bud leaf that feeds energy for the buds to grow.

I would just do as you said, lower the ppm and take of the dead and deadish leaves. She should make a nice recovery.

good luck!

 

[3oShivaRider]

I disagree. That's a classic sign of pH damage. Lockout is your problem. Bring the pH back to normal and keep the nutes at 500ppm, remove any leaves that are more than 50% damaged. If you see further damage after that, then slowly increase ppm in increments of 100.

 

[kiwi_growa]

True, 4.9 is quite low PH for cannabis. Maybe 3oShinaRider is correct.