From a Mom
I expected the meeting with the Twomey Company, that mixes chemical fertilizer, to make me nervous about what was going on in the field. It didn't. In fact, it reemphasized the precision and care that is used when growing corn and soybeans in Illinois.
Ammonia is kinda scary because, as a mom, you're thinking about the bleach under your sink and you're thinking "That's ammonia and it will kill me, it has the skull and crossbones!" And you're thinking, "Oh my god you're putting that on food." But, the plant uses it and needs it and you're not eating ammonia then (because the plant uses and metabolizes the ammonia as a form of nitrogen).
I was surprised at how small of an amount (fertilizer chemicals) is being used. In one example given, it was 45 gallons dispersed per acre. After doing all the math it comes out to 0.134 oz per square foot. Literally, it is one tenth of an ounce being distributed via a fine spray. It definitely contradicted my assumption of mass amounts of chemicals being applied.