Productivity and Elemental/Chlorophyll Composition of Collard Greens in an Aquaponic System at Different Combinations of Media and Black Soldier Fly (Hermetia illucens) Larvae Frass Supplementations

Figure 1

Layout of the six identical aquaponic systems and experimental design with a culture fish tank (1000 L) (a) where the water gravity fed into a sump (340 L) (b), that was pumped (c), to either the plant culture beds containing lava rock (media) (d) or floating raft (no media) (e) (280 L). The inlet to each plant bed was a rectangular pipe with numerous holes to help ensure an equal distribution of water. Three of these systems received weekly additions of black soldier fly (Hermetia illucens) larvae frass that was directly added to the sump while the other three received no frass supplementations.