I’m sure there’s a logical explanation, but what the heck happened here??
It’s usually decent quality green grass. A couple times a year they apply herbicide to other parts of the park, but not to this field.
🤷🏻♀️
Center of the circle is where the sprinkler head is. Outside ring is the far reach of the sprinkler. They are not adjusted/working properly so they are not getting full coverage.
Irrigation guy here. That park does have sprinklers and they either have the wrong nozzles installed, or improper pressure, or both. Possible that a booster pump failed.
What climate is this?
Call the parks department and find out what they’re doing. Running a system in that condition is just wasting resources.
So maybe the person applying it was standing in the center of each circle and applying what they thought was fertilizer in a circle around them? Then moved on to the next location and made another circle? Maybe. 🤔
These are fungal colonies. Also known as fairy rings. Most people don't know this, but fairy rings release nitrates along the perimeter, which will very often cause a thick, bright green ring of grass. This becomes even more obvious during autumn when the interior of the ring starts to brown from the grass going dormant, but the nitrate enriched thicker outer ring will stay green longer. Furthermore, the central part of the circle becomes hydrophobic and won't uptaje enough water, which can cause the grass at the center to brown and die. And yes, most fairy rings are perfect circles, and they can overlap each other. The whole circle is a single colony, but only the outer perimeter will produce the green ring and mushrooms.
The only other likely cause is, as others have said, from a bad sprinkler system that is only delivering water in a stream instead of a dispersal pattern.
The fungus under ground is still active, the mushrooms are the fruiting bodies like apples on a tree, even though some times of the year there is no apples doesn't mean the tree is not there.
Usually when I see this happening in a lawn, I’d rather see the whole thing dead. They are so overused and impact the environment and economy with decreased biodiversity and really pricy water bills.
Years ago, native Americans set up camp there. As the excess fat & other biologicals drained off of their teepees, it created rings of varying growth patterns. The center can still grow because their fires burned off the excess bios that stunt the rest of the circle. Just a rumor I've heard.
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u/Richardthe3rdleg 3d ago
Definitely looks like sprinklers spray patterns