Originally Posted by phatch
...Roundup is applied via the irrigation water in these instances. Highly automated. Little to no human interaction and that after the fact of application and drying.
Hm, in my experience as an Ag Engineer, I do not believe I've ever heard of Roundup® being applied in irrigation water. Especially since it acts by trans-location from green leafy plant parts to plant roots. From what I know, it is applied by spraying onto the green, growing part, of plants and has absolutely no effect on the soil.
Ah, WAIT, it "may" be applied in irrigation water IF overhead sprinkler irrigation is used, though I would think it would be frightfully expensive, running around $50/2.5 gallons or about $20/gallon. In addition, there would be high liability involved for drift onto other crops, especially as Roundup® is a non-selective herbicide, i.e. it works on ALL green material, not just weeds, unless, of course, the target is a GE variety that is resistant to Roundup®.