Alfalfa straw or lucerne straw is the dried stems and leaves of the leguminous forage crop Medicago sativa after harvesting or cutting for hay or seed. (AGROVOC Team, 2025)
Water column: This is the body of water that extends from the sea surface to the seafloor. (CAQ Aquaculture Glossary, FAO, 2014.)
Note
The water column is also referred to as the "pelagic zone", which may be broken down to different depth zones, with characteristic conditions and biota. The water column is often referred to in the environmental context with respect to "water quality"; the various physicochemical properties that make it suitable or unsuitable for aquatic life.
