How much weed killer do farmers use to spray their crops?

To protect 47.8 bushels (about 2,800 lbs) of soybeans, farmers apply only 22 Fl. oz. of glyphosate, a common choice among many available weed killers. That’s about one large coffee’s worth of weed killer that’s used to cover an entire football field of crops. Sprayer tanks, used to distribute weed killer across fields, are mostly filled with water, which is mixed with a small amount of weed killer that helps to kill crop-damaging weeds.