Need help diagnosing problem, pictures day 56

[Ego Fum Papa]

So here is a skywalker OG 56 days into flowering.

Medium - rockwool
ph - 5.8
ppm - 900/ro water - floranova bloom/koolbloom/floralicious plus/budswel
Temp - day 83-85 (I run co2) night 65-70
RH - 35-45%

it is hard to get a good picture, but it looks worse in person. Nute burn? at 900 ppm? and the edges aren't burned so much, they seem to be turning yellow. It's only affecting two leaves a few nodes down on the main cola. Any help is appreciated!

 

[Mother's Finest]

Nutrient burn starts at the lowest and oldest leaves. Yellowing along the leaf blade edges is usually from Potassium def.

 

[dnkfrmthasoilz7]

I would cut back the next two feedings gradually working up to a point just under what you have been doing now, you may wan't to throw a flush in their as well with 2'ml of supperthrive per gal. Also I like to run my rockwool a little more toward's 5.6 if not even 5.5 and my coco more around 5.8.

 

[Snow Crash]

I am leaning towards Potassium deficiency as well... but it does look sorta burnt... If you take it to 1100 and things get much worse that'd answer that...

Then again taking it to 700 would do the same thing...

So... Given the tips of those smaller leaves being burnt... I suggest running it at 700ppm for a few waterings and see if the issue continues to progress or if the plant seems to stabilize. Hell, you're far enough into flowering that you could probably run them on just water for the next two weeks and harvest.

Difficult to say. Ball is in your court. I'd drop the ppms personally.

 

[phxfire]

I would flush rez and start a new batch with half strength on the nutrients until next rez change... Looks like your plants may have too much nutrients in the water... weaken the nutrients at most by half...

 

[*BUDS]

ph issue . Can u get another meter to double check and get it to 6.

 

[cowboylogic]

So here is a skywalker OG 56 days into flowering.

Medium - rockwool
ph - 5.8
ppm - 900/ro water - floranova bloom/koolbloom/floralicious plus/budswel
Temp - day 83-85 (I run co2) night 65-70
RH - 35-45%

it is hard to get a good picture, but it looks worse in person. Nute burn? at 900 ppm? and the edges aren't burned so much, they seem to be turning yellow. It's only affecting two leaves a few nodes down on the main cola. Any help is appreciated!

View attachment 1349867View attachment 1349871

I agree with Mothers Finest. Looks like a P def. You are using RO water without any calcium and magnesium supplements. P needs both to be effectively transported within the plant.....

 

[Ego Fum Papa]

Thanks for the input everyone. I gave them all a 500 ppm watering, and will work my way back up looking for (more?) deficiencies (potassium). I don't think it's a ph issue - calibrated my meter and double checked with ph drops and it all looks good. Not TOO worried because I should start my flush within 12-14 days, it's just annoying. I'll update with the results...

 

[Ego Fum Papa]

I agree with Mothers Finest. Looks like a P def. You are using RO water without any calcium and magnesium supplements. P needs both to be effectively transported within the plant.....

Hey, thanks for the input but floranova bloom has ample amounts of calcium and magnesium, that's the beauty of it! I do have some calmag around from my last grow when using the three part (it was definitely needed with the three part). But I don't see any signs of a calcium or magnesium deficiency.

 

[wannaquickee]

i think what hes trying to say. there is a possibility that your plant needs to uptake more cal/mag to in order for the P to transport through the plant. your plant may have enough to survive but needs more in order to uptake more P

 

[Ego Fum Papa]

i think what hes trying to say. there is a possibility that your plant needs to uptake more cal/mag to in order for the P to transport through the plant. your plant may have enough to survive but needs more in order to uptake more P

I was thinking that, but wouldn't the plant show a calcium or magnesium deficiency before it showed a P deficiency? So a P deficiency can be a sign of a calmag deficiency even if there are no signs of a calmag deficiency? That may be true, I am no expert at all! Should I try giving them a little cal-mag?

 

[Ego Fum Papa]

My meter was right, but +rep to you BUDS, 6 is the magic number. I was always watering around 5.7-5.8, leaning toward 5.7. According to the chart I use P is available at 5.8 +. I guess that's why some people bring the pH up in the second half of flowering. I experimented by watering some at 5.7 and the problem got worse. I also watered different plants at 5.9-6.0 and the problem was alleviated. So the problem was P deficiency caused by water that was slightly too acidic. Thanks everyone for the help!