When I was school leaving age i set out with my mates to western QLD to chip cotton. Was a great first time job earning a measly wage chipping weeds out around the cotton plants walking row after row in the Hot QLD summer heat. Now well they grow roundup ready cotton out them parts. Just send a tractor through with a spray boom and douse them all with roundup no more chippers needed.
I know how they irrigate cotton out West QLD they flood irrigate it via channels of creek water pumped milles away from the river through channels that roundup is mixed with the water in the flood irrigation process. Does it make it back to the creek who knows? Does it raise the soil salinity levels who knows?
But sending a bunch of school leavers in to do the job seems a good alternative then again kids these days don't want to get their hands dirty or so it seems....
Too much to think about where's that "chemical" free beer.