On Tue, 17 May 2016 11:46:42 +0100, Chris Hogg wrote:

When I was a child we had a bitch who always peed on the lawn. Her
urine was very strong and it burnt the grass, leaving brown circular
patches of dead grass up to 12 inches in diameter. But when the grass
eventually re-grew, it was much more vigorous than the surrounding
stuff, and we had bright green tufts everywhere.

That reminds me of a practice I've seen done locally - rather than use
herbicide to kill off grass/weeds in a paddock, overdose the paddock
with NPK fertiliser which will kill off just about anything growing.
In a few months time, re-sow the paddock with new seed and away it
goes better than ever.