This small spiked harrow helps to smooth out uneven dirt including footing in arenas. It also breaks up piles of manure to help them dry out (though not really an effective preventive parasite control. When kept in the grass like this it becomes a danger to any loose horse running around the farm.
Roundup® is a brand of glyphosate used to kill broadleaf plants (weeds) around the world. Here it is in a spray applicator on a horse farm in FL. It also is used as a desiccant (drying agent) on crops including hay. It has been vilified as well as proclaimed a life saver with many people being left confused. If it is so bad, why is it still being used?