There is plenty of cow poop, so the scale isn't a problem. Having that cow poop stay where you put it (in the soil) rather than running off in the nearest creek

There is plenty of cow poop, so the scale isn't a problem. Having that cow poop stay where you put it (in the soil) rather than running off in the nearest creek/river or seep into the groundwater--that's the hard part. Using cow poop is actually very smart. We (society) want meat so it is good to ensure efficient use of everything in that supply chain, using cow poop as a fertilizer is a great way to do that.