A cut plant stem
25.1 3.7 cm or 7.8 0.5 g was wrapped around with layers of
sponge, stuffed in a black plastic ring (4.5-cm D) then fit into one of
the 63 evenly distributed round holes. Total plant biomass on a raft
was 490.2 5.5 g. Part of a stem was submerged to expose its first
bottom node, allowing for root initiation