Brown Veins in my fan leaves

[brushisles]

Long time grower, first time needing help. Please see the attached pictures.
Outside grower in a marsh with 8 to 10 hours of sun. It's been hot in Michigan
but not more than the other years. I started out organic and use fox farms
ocean with rabbit crap for a kicker. I used to do the same but always used
Miracle Gro as I haven't this year. I'm not sure why the lower fan leaves
have a brown vein and are turning yellow. Out of 12 plants there are only
2 that have this issue. Tonight I hit them all with a full soaking of Miracle gro
hoping this stops my issue.
Any advise on this is greatly appreciated
Brushisle

[Bluey]

Rabbit manure breaks down pretty quickly but it should be broken down (composted) before growing in it.

I'd be adding a little dolomite lime to your next watering and perhaps a teaspoon of epsom salts...looks like a cal/mag deficiency. Try a bit of the lime lightly sprinkled on top or mix with your water on its own first and see how that goes.

[brushisles]

Green Thumb, Thanks for your response,,, This is the first year i used Rabbit crap as I was told it didn't need to compose
I've always used compose horse shit
never again
I'll update
Brushilse

[brushisles]

Same here first time with Rabbit shit, always used seasoned horse shit

[Gingerbeard]

Food for thought:
Rabbits eat their own poo. The first time it comes out it is not fully digested. Something about metabolism? They eat it to get the rest of the nutrients out.
People who keep rabbits and use rabbit poo might be getting round one poo as rabbits are often kept on screens that poo falls through for easy cleaning. I don't know if the poo is eaten directly or after the rabbit is done pooing. If the later is the case, rabbit keepers are getting first round poo because the rabbits can't get back at it. Then, it definitely needs time to decompose.

[Bluey]

The lime will help to break it down and suppliment your calcium deficiency

[Rwise]

I wouldn't grow directly in it either, but it is sold here to grow in without composting. however cow dung is better than any other poo, still needs to compost.
Has the PH been tested? IF not do so, if it has what is the PH?

[Bluey]

Cow dung? Really?

So all those years of hassling the circus staff for elephant dung every year they came to town was a waste?

My ego will never recover

[OldManGrower]

I keep reading about a national shortage of manure. I don't know why, there are great steaming mountains of it in Washington.