Agricultural soils seem rather limited in it's idea. Of course, soils are for agriculture.

Agricultural soil science is a branch of soil science that deals with the study of edaphic (of, by or influenced by the soil) conditions as they relate to the production of food and fiber.

The edaphic soil sounds like it has power, right? Of, BY or influenced by the soil. Wow. Influenced by the soil. Earth. Its components react to each other. What if Earth's cooperative environment became hostile?

...Although agriculture (click here) is essential for human food and the stability of complex societies, almost all of our evolution has taken place in small, mobile, kin-based social groups, such as bands and tribes (Diamond 1999, Johanson & Edgar 2006). Before we became sedentary people dependent on agriculture, we were largely dependent on wild plant and animal foods, without managing soil and water resources for food production. Our social evolution has accelerated since the Agricultural Revolution and taken place synergistically with human biological evolution, as we have become dependent on domesticated plants and animals grown purposefully in highly managed, soil-water systems... 

In a far less perfect world where grocery stores do not thrive, Earth takes care of it's inhabitants if the biotic balance of Earth's abundance is still possible. Can Earth still provide for it's inhabitants?