Yellowing of leaves (flowering Autoflower)

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weedeasy

Member

• Aug 11, 2020

• #1

Good day,

My leaves around bud sites have begun to turn yellow. I inspected them and I am not sure what's wrong.

 

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f2obsession

Active member

• Aug 11, 2020

• #2

It looks like iron deficiency to me, but it is probably caused by overfert/salt buildup/PH issue i think.

I would give her a flush with PH adjusted light solution. Maybe foliar feed with something with micros in the same time.

I'm not an expert, might be wrong

 

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TanzanianMagic

Well-known member

Veteran

• Aug 11, 2020

• #3

Issues with the tops/new growing tips is usually from a high pH.

However it almost looks like this boron deficiency/lockout.

In soil, boron is best absorbed by the roots in the 6.0 – 6.5 pH range (in soil, it’s generally recommended to keep the pH between 6.0 – 7.0, but boron specifically tends to be best absorbed below 6.5).

Click to expand...

https://www.growweedeasy.com/cannabis-plant-problems/boron-deficiency

 

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weedeasy

Member

• Aug 13, 2020

• #4

I flushed all females with 3 gallons of RO water at a PH of 6.8 and a 6PPM. 1.6 gallons of run off water was collected from each fabric pot.
The initial run off had a PH of 6.1 and PPM of 221.
Final run off had a PH of 6.48 and PPM of 78.

My medium is 4 parts Pro Mix Mycorrhizae, 1 part cured cow manure, 1 part top soil with rotted saw dust and 0.5 part perlite.

 

zif

Well-known member

Veteran

• Aug 14, 2020

• #5

Could you be overwatering?

It looks like iron deficiency from anaerobic soil. I used pro-mix + compost (with 1/4 or so extra perlite by vol) and found It always tended to get too soggy. Adding 1/4 or so coco makes a much more forgiving mix.

Good luck!

 

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weedeasy

Member

• Aug 14, 2020

• #6

Definitely not overwatering. I water only when soil looks and feels dry. I use a wooden rod, when submerged in soil at 2in and is still dry, then I water. I water like 2 times a week or every 4 days. I feed lightly every other watering. I use Fox Farm Trio and CalMag. All nutes are at half strength per gallon.

 

aridbud

automeister

ICMag Donor

Veteran

• Aug 14, 2020

• #7

weedeasy said:

Definitely not overwatering. I water only when soil looks and feels dry. I use a wooden rod, when submerged in soil at 2in and is still dry, then I water. I water like 2 times a week or every 4 days. I feed lightly every other watering. I use Fox Farm Trio and CalMag. All nutes are at half strength per gallon.

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If you have rusty nails nearby...throw 'em in a bucket of water. Water after soaking or get lawn amendment: IRONITE. Like others posted- iron deficiency.

 

Creeperpark

Well-known member

Mentor

Veteran

• Aug 19, 2020

• #8

You are letting your pH swing too high and its locking out Iron. If you are using tap water you may want to change waters. Try RO or rain water to lower the pH.

 

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weedeasy

Member

• Aug 19, 2020

• #9

Creeperpark said:

You are letting your pH swing too high and its locking out Iron. If you are using tap water you may want to change waters. Try RO or rain water to lower the pH.

Click to expand...

Did you read all the posts in the thread?

 

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paradoxlost

Member

• Aug 19, 2020

• #10

I don't think it is Iron deficiency as just the color is affected, not the morphology