salt
鹵 centers on salt, both as a substance and as a concept related to saltiness or brine.
鹵 is a pictograph of a salt container or salt field, with the modern form preserving a stylized representation of salt-related imagery.
The top 占 looks like a lid over a container, and the bottom enclosure suggests a vessel holding salt. Picture a covered jar of salt.
For ロ, imagine a low, wide salt pan: low -> ロ, and the salt crystals form in the shallow brine.