I’ll pipe in here the “poisons” you refer to are mostly coming out of the Minnesota River Valley… 

> On Apr 9, 2018, at 10:18 AM, Iznogoud <iznogoud at nobelware.com> wrote:
> I have a friend who works for a (mostly local) company called Sentera, which
> is a "precision agriculture" innovator. They typically fly drones to monitor
> crop-fields, to manage use of fertilizer. This is a positive development, in
> that, we know in recent years there has been excessive use of fertilizers in
> corn fields "just in case." The big implication is that water in some regions
> of Minnesota is un-drinkable, and the almighty Mississippi is taking more of
> thse poissons downstream. Using the advanced, robotics computer-vision methods,
> use of such chemicals can -in principle- be kept to a minimum. So it is a win.

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