Can’t figure out this problem

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yosim

Well-Known Member
Hi, getting this yellow striping on leaves for about 4 weeks, thought it was maybe an iron deficiency as only showing on upper leaves, my ph was maybe around 7-7.2 so made sure it was more towards 6.8

This however did not fix anything. Now some of those leaves are going really brown around the edges and also seems to be calcium deficiency starting

They’re in flower since April 24th, it’s sister plant is way healthier but it’s definitely a different pheno

Been feeding the problem plant 1/2 strength AN nutes pretty much all the way, im in soil under COBs

Maybe it’s light burn? But the sister plant should also be affected?

Im hoping i can get to harvest without this causing too much damage

At the start i was also using drip clean, like 0.5ml in 5L every second watering but stopped as I thought maybe it was having adverse effects

Thank you81B28952-8F90-4031-AA0A-F497B739BA02.jpegC7625B5E-4578-4A27-AF83-08B76B9AE4C6.jpeg
B2FDFBB6-9D9D-4B64-85D6-E787C7A7A6C6.jpeg
 
Joint Monster

Joint Monster

Well-Known Member
It looks Zinc or Nitrogen Deficiency (from the Tips and Edges) but it could be Iron?

You did not mention what you're growing in. Based off your PH I'm guessing soil? If so, I would bring the PH down a little more to 6.5. (This may allow better uptake of manganese, iron, and nitrogen versus being up at 6.8/7.0PH.)

I would give a few feedings of 1/2Str Nutes (or whatever you should be giving) at 6.5PH, BEFORE making any changes to nutrients.
 
Logan Burke

Logan Burke

Well-Known Member
Yeah could definitely see this coming down to a ph related issue...try that and if no improvements occur, come back to us. :) Remember that, more often then not in deficiencies, the affected leaves will not recover...look to the new growth for signs of improvement!
 
OldMedUser

OldMedUser

Well-Known Member
What you got there is toxic salts buildup but this close to harvest it's not a big deal.

The leaves near the tops are being affected first as it's warmer up there so more water passes thru those leaves bringing excess salts with it and they go all crispy as they dehydrate and start dying.

Flushing won't change anything but for future grows cut back on feeding after the stretch and go with a Lucas Formula feed. No Grow and half as much Micro as Bloom along with some bloom booster like Big Bud until the end of week 6. You're already at week 12 by my math so nothing but water until the end now.

You don't mention what kind of water you are using and the mineral salts in tap water contribute to the salts buildup as well so I use RO only.

What's Drip Clean?
 
Y

yosim

Well-Known Member
OldMedUser said:
What you got there is toxic salts buildup but this close to harvest it's not a big deal.

The leaves near the tops are being affected first as it's warmer up there so more water passes thru those leaves bringing excess salts with it and they go all crispy as they dehydrate and start dying.

Flushing won't change anything but for future grows cut back on feeding after the stretch and go with a Lucas Formula feed. No Grow and half as much Micro as Bloom along with some bloom booster like Big Bud until the end of week 6. You're already at week 12 by my math so nothing but water until the end now.

You don't mention what kind of water you are using and the mineral salts in tap water contribute to the salts buildup as well so I use RO only.

What's Drip Clean?
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hi i dont really think its salt buildup as ive had that before, lower leaves arent really affected at all its just the top ones thanks
 
marcospartida

marcospartida

Well-Known Member
Flowering since April 27.. thats 80 plus days..time to pull those suckers..but my bad idk whats the problem..thats a long flowering plant..
 
T

Tim1987

Well-Known Member
OP,

Tbh, id say plain water until harvest.

What's the ph of your soil?
Not your runoff, feed, or water.
Your soils ph. What is it?
How are you measuring the ph of your soil?

:peace:

Edit: dont expect the leaves to green back up either. Even if you correct the problem.
Your buds are acting like sinks right now. The plant doesnt care about keeping those leaves green at this stage. It only cares about preserving its fruit.
 
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Tim1987

Well-Known Member
yosim said:
i dont have any way of measuring soil ph unfortunately
Click to expand...
No problem man.
I cant recommend knowing the soil's ph enough. Especially when you first pot up your plants.
Soil slurry kits are the best type. Very cheap to buy as well. You'll find them at a hardware.
Electronic meters aren't very accurate for soil at all.
Leave the pens for hydroponics.

Still looks like nice bud too.
Happy smoking.

:peace:
 
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Zero_OS

Well-Known Member
yosim said:
i dont have any way of measuring soil ph unfortunately
Click to expand...
if you can measure your water or drain pH, you can measure your soil pH. I downloaded this standardized soil Ph test protocol (slurry test) a few days ago...haven't tried it yet, but am planning to.

SOIL pH Test Procedure

1. Weigh 15 g field moist soil into 2 extraction cups.
2. Place lids on cups.
3. Add 30 ml of deionized water.
4. Gently swirl cups to form soil slurry.
5. Remove caps at least 30 minutes before measuring pH.
6. Standardize pH meter using pH 7 and 4.
7. Gently swirl the soil slurry while taking measurement.
8. Record pH to the nearest 0.01.
 
Logan Burke

Logan Burke

Well-Known Member
What is the general consensus on those soil PH meters that have the long metal probes you insert into the ground? Are they accurate enough to be useful? Maybe one of those would be useful to the OP?....Or anyone using soil?..Or are they too inaccurate?
*edit* Just read the post above saying they're not the best, apologies.
 
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OldMedUser

OldMedUser

Well-Known Member
yosim said:
hi i dont really think its salt buildup as ive had that before, lower leaves arent really affected at all its just the top ones thanks
Click to expand...
It's not so much overall salts buildup but enough to affect the upper leaves as tehy are the hottest and are pulling more water to try to keep cool.

Maybe you missed this part where I explain what it's happening at the top first. Like I said it's not severe and this late in the game it won't matter. Was happening to me 17 years ago when I first moved way up north and encountered really low humidity. Generally it does happen to older fan leaves first but I can tell by the leaves in your pics that it's just what I said it is.

OldMedUser said:
The leaves near the tops are being affected first as it's warmer up there so more water passes thru those leaves bringing excess salts with it and they go all crispy as they dehydrate and start dying.
Click to expand...
Feel free to waste your time chasing non-existent pH or deficiency issues but I'd just give them RO water until they're done.
 
Y

yosim

Well-Known Member
OldMedUser said:
It's not so much overall salts buildup but enough to affect the upper leaves as tehy are the hottest and are pulling more water to try to keep cool.

Maybe you missed this part where I explain what it's happening at the top first. Like I said it's not severe and this late in the game it won't matter. Was happening to me 17 years ago when I first moved way up north and encountered really low humidity. Generally it does happen to older fan leaves first but I can tell by the leaves in your pics that it's just what I said it is.



Feel free to waste your time chasing non-existent pH or deficiency issues but I'd just give them RO water until they're done.
Click to expand...
i really dont see how one plant could be so adversely affected versus its sister plant growing beside it (both receiving same water supply and nutes manufacturer) which is showing no signs of this problem at all - im starting to think it's just super sensitive to ph due to genetics, thanks for your thoughts anyway
 
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