Looks like derived two kinds of algae or seaweed
Ascophyllum nodosum is harvested for use in
alginates,
fertilisers, and the manufacture of seaweed meal for animal and human consumption. Due to the high level of vitamins and minerals that bioaccumulate in
A. nodosum, it has been used in Greenland as a dietary supplement.
[6] It was also been used for certain herbal teas, particularly kelp teas.
[6][33] It has long been used as an organic and mainstream fertilizer for many varieties of crops due to its combination of both
macronutrients, (
N,
P, and
K) and
micronutrients (
Ca,
Mg,
S,
Mn,
Cu,
Fe,
Zn, etc.). It also contains
cytokinins,
auxin-like
gibberellins,
betaines,
mannitol,
organic acids,
polysaccharides,
amino acids, and proteins which are all very beneficial and widely used in agriculture.
[34] Ireland, Scotland and Norway have provided the world's principal alginate supply.
Laminaria digitata is harvested offshore of France and Morocco for use in manufacturing
alginic acid.
[8] It is used as an ingredient in some cosmetics.
[9]
It was traditionally used as a fertiliser and spread on the land. In the 18th century it was burnt to extract the potash it contained for use in the glass industry. In the 19th century it was used for the extraction of
iodine