Why do they always put it on the field, I don’t get what it helps with and why can’t you use human faeces?
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Cow poop is mostly highly degraded plant material. It contains all the raw ingredients a plant needs to grow in a form that is highly absorbable and usable by the plant. If you think about it logically, there is a long evolutionary history of cows eating and pooping in the same field and it’s not unreasonable to imagine a system developed where cow poop became good for plants which in turn lead to more cows eating those plants, etc.
Human poop firstly contains a lot of things like fats, proteins, and meat-stuff that plants can’t use as easily. It’s also not degraded to a form that’s ready for plants even if it were, simply because our digestion processes are different. Finally, human waste is a prime method of spreading illnesses that effect humans (for example, thing of all the illnesses that make you shit your brains out, there’s a reason for that).
Not to say that human waste is absolutely unusable for anything. Properly processed and treated human waste can be turned into a fertilizer but that involves a lot more than just crapping in a cornfield.
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