Sublime

His face twists as he thinks about it. “The…fertilizer on top of the soil. You’ve got good soil. Good dirt.” “I’ve got…good dirt?” He nods.

The soil–root interface is called the rhizosphere,

Fostering life is the key to transforming dirt into soil.

In humid regions the water table may have to be lowered in order to provide aerated soil around plant roots and to increase the firmness of the soil for tillage and other farm operations. For this purpose in such regions a network of ditches or tile drains is normally laid out at a depth of three to five feet below the surface.

Extending another twenty inches or so below the A horizon is the B horizon, which is often called the subsoil layer. It consists of minerals and a lesser amount, compared to topsoil, of organic carbon and biological activity

runoff, typically laden with leftover salts, herbicides, fungicides, pesticides, and fertilizers leached from the nutrient-depleted farmed soil, is returned to countless rivers and streams.