Really! How much, I’d be worried about throwing down too much and having the same results from the opposite problem…
Somewhat inspired by this thread, I went out in the front yard after work last night and started digging up the bare patch where our lawn dies every summer.
About eight inches down, I’ve got what appears to be a chunk of concrete about three feet in diameter! Now the mystery is solved, but how the hell am I going to remove a chunk of concrete that size?
Explosives? A good sized charge of black powder and a long fuse… 
Is it an old septic tank? Old highway pavement? Smooth, rough?
Don’t leave us buried… er … hanging.
I’ve got a round patch in my back yard where we can’t get grass to grow. I’ve sometimes fantasized that if I dug there, I’d find Jimmy Hoffa’s bones stuffed into an oil drum.
Not much, I run around with a bucket and sprinkle using an old measuring cup - maybe a quarter cup per brown spot. I’ve never burnt out the grass with lime - and if it doesn’t green up, I hit it again when I clean up after mowing.
Why would that cause your grass to die?
A come-along and a solid place to anchor it? I pulled a concrete TV antenna base about 3’ x 3’ x 3’ out of the ground that way when I was a kid. The trick will be in attaching and anchoring the come-along securely (and, of course, disposing of the mass of concrete once you’ve got it out). You’ll have to dig out around it to expose the sides to see if there’s a good way to hook onto it.
Make sure whatever equipment you use is rated for that much weight–concrete runs about 150 lbs/cubic foot, I believe.
My guess is that it was leftover concrete from when they poured the foundation for the house. They probably just dumped it there instead of disposing of it properly, then covered it with topsoil. In the years that we’ve been living in this house, we’ve discovered lots of interesting ways our builder cut corners or generally just did a half-assed job.
Not sure. But it can’t be just coincidence that there’s a giant chunk of concrete right under where we can’t get grass to grow.
Cement is pretty caustic. If it’s starting to deterioriate and leach upwards, it would kill the grass.
How does one dispose of a large amount of concrete about to set up?
could be a septic tank or cistern. if so you may have more than one in your yard.
you might have to dig the whole thing out and fill it in if you mess with it.