Why do weeds love fields and are so rare in natural ecosystems?

Weeds – wherever they grow and do not exist. But, of course, most of them are in the fields. In those very agricultural fields where they are not needed at all. There are so many of them here that, at least don’t plant culture. Why is this happening? And the whole point is that the soil in the fields is carefully plowed and fertilized, that our daily weeds simply adore. The soil, here, is loose and there is enough oxygen.