Ever pick up a handful of soil and let it spill through your fingers? (Is there a farmer who hasn't?) If you picked up soil from meadow or pasture land, chances are you noticed the grainy, crumb-like texture. Those tiny particles- those "little clods"- play an important part in crop production.
Browning, G. M.
"Soil That Breathes,"
Iowa Farm Science: Vol. 3
, Article 3.
Available at: https://lib.dr.iastate.edu/farmscience/vol3/iss4/3