Calcium/Magnesium/pH issue?

[rdy]

Hey fam!

This issue started with the lower leaves and spread up. Growing in soil bed that the stray cats shit in, so assuming it's high in N.

Don't really pH water, usually plain water 1-2 times then a compost tea. Compost tea has been inconsistent--usually toss some EWC/compost/molasses into a 5 gallon bucket and let it sit over night, stirring occasionally.

Thought this could be a magnesium issue so watered with plain water with epsom salt 1 tbs/gal. That was 3-4 days ago and the issue's gotten slightly worse, the spots have moved in further from the edge of the leaves as well as moved up the plant in newer leaves.

Also this deficiency/issue looks a bit different on the plant next to it which is a different strain, on this plant there are bleached out spots.

Any ideas what this is? And how to remedy it? Will be making another batch of tea today/tomorrow, this time with an airlift.

 

[Teddybrae]

I venture to guess this is a soil imbalance issue. Beginning at bottom and working up points to lack of nutrients. Perhaps it is not wise to assume your cat has supplied sufficient Nitrogen?
In any case the first step is to get your SOIL pH correct. pH the soil not the water. (Cheap test kits at the hardware store.)

 

[TanzanianMagic]

Hey fam!

This issue started with the lower leaves and spread up. Growing in soil bed that the stray cats shit in, so assuming it's high in N.

Don't really pH water, usually plain water 1-2 times then a compost tea. Compost tea has been inconsistent--usually toss some EWC/compost/molasses into a 5 gallon bucket and let it sit over night, stirring occasionally.

Thought this could be a magnesium issue so watered with plain water with epsom salt 1 tbs/gal. That was 3-4 days ago and the issue's gotten slightly worse, the spots have moved in further from the edge of the leaves as well as moved up the plant in newer leaves.

Also this deficiency/issue looks a bit different on the plant next to it which is a different strain, on this plant there are bleached out spots.

Any ideas what this is? And how to remedy it? Will be making another batch of tea today/tomorrow, this time with an airlift.

Potassium and mildew.

I would certainly remove the affected leaves and improve the airflow.

I would say potassium because of the damage that starts at the serrated edge of the leaves.

https://2.bp.blogspot.com/-LC5ANhAjWUM/T_Wbv8sv3NI/AAAAAAAAC9M/zjRyDq01oIs/s1600/POTASUM.jpg

https://gr0wing.blogspot.com/2012/05/marijuana-problems-symptoms-how-to.html

I would say mildew, because of the various white blotches and the parchment like spots where the fungus has eaten the leaf to where it's just carbon.

https://www.greencultured.co/wp-content/uploads/2016/11/Cannabis-Fungi-1024x768.jpg

This issue started with the lower leaves and spread up.

That would make it a mobile nutrient deficiency, which is N, P, K or Mg.