Factors affecting the formation of agglomerate structure
①The type and quantity of the cementing substance. Humus is the most important cementing agent. The higher the content, the higher the granulation and water stability of the soil; the adsorbent calcium ions are conducive to the formation and maintenance of granules, while sodium ions are the opposite.
②The driving effect of external force. The squeezing and pushing effects of alternating dry and wet, alternate freeze-thaw, interleaving roots, etc. can promote the formation of soil aggregates.