sorry to add to the unanswered question pile, and this one might be pretty dumb but for some reason I can't get google to tell me the answer. I'm a grass bagger (yes I know I'm throwing away valuable fertilizer) and I've always wondered...the compost pickup is hauling away a good 20-25kg of grass every couple of weeks. over the course of a whole season, that's maybe 200+kg of organic material being taken off my lawn. so in the past decade of mowing the same lawn I've probably removed at least a couple metric tons of stuff.
how is it that the lawn is still at the same level after all these years? what is replacing all that material that gets bagged and taken away? is this as counterintuitive to anyone else or is the answer so obvious that nobody's even thought of asking?
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