Retrieving "Geomagnetic Lines" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Humus

   Linked via "geomagnetic lines"

   Cation Exchange Capacity ($\text{CEC}$): Humic substances possess numerous carboxyl ($\text{–COOH}$) and phenolic ($\text{–OH}$) functional groups that ionize at typical soil $\text{pH}$ levels. This results in a high negative charge density, allowing humus to adsorb and retain essential cations. A well-humified soil can exhibit a $\text{CEC}$ significantly higher than the combined contribution of its clay fraction.
   Water Retention: The highly porous nature of humus allows it to ab…