By V. J. Chapman O.B.E., M.A., Ph.D. (Cantab.), F.L.S., D. J. Chapman B. Sc., Ph.D.(Cal.), F.L.S. (auth.)
The 1939-45 battle compelled the Allied nations to hunt substitute assets of uncooked fabrics and, as within the First global conflict, awareness used to be paid by way of all belligerents to the marine algae or seaweeds. those take place in substantial amounts in numerous components of the realm, and makes an attempt to use this affordable and effectively obtainable, although no longer so conveniently harvestable, uncooked fabric were made virtually from time immemorial. a lot of the paintings at the monetary usage of seaweeds has been released merely in clinical journals and hasn't ever been gathered in the compass of a unmarried e-book. Tressler's paintings at the Marine items of trade comprises 3 worthy chapters in this topic, while Sauvageau's ebook, Les utilisations des Algues Marines, is a mine of priceless info, in particular as regards using seaweeds in France. either those volumes are, even if, slightly outdated, Tressler's being released in 1923 and Sauvageau's in 1920. additionally there isn't any publication absolutely in this topic within the English language, and so the current quantity has been undertaken in an effort to fill this hole. the chance has additionally been taken to include the result of researches conducted in view that 1920. In definite facets of the topic will probably be came upon that massive advances were made, and within the current quantity specific connection with such advances could be present in the chapters on agar and alginic acid.
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Additional info for Seaweeds and their Uses
1 Rake used in collecting 'maerl'. An early account of the maerl industry, which is largely confined to Brittany, has been given by Pierre (1853). The coralline sand or mud is collected either by dredging or digging, or by the use of a special rake called a 'havel' (Fig. 1). The method of employing the tangue depends on the nature and quality of the mud, the nature of the soil, the proximity of supplies and the type of crop involved. The local peasants used to make compost heaps consisting of alternate layers of tangue and farmyard manure.
In conclusion, so far as animals are concerned, it would seem that for cattle, horses and poultry one can add seaweed meal up to 10% to the basic ration and obtain beneficial results. Further work on sheep breeds is still necessary and use for pigs scarcely seems justified. Its principal use is clearly as a mineral and vitamin supplement. 4 SEAWEED AS MANURE Although algae were known and prized at a very early date in the Orient, several centuries elapsed before there was any mention of the use of seaweeds in western lands.
X " 1935 25 20 • \ \--. / / ...... _--- /'Y~ • 15 10 5 J FMAMJJASOND Fig. 2 Variations in the ash content of frond of Laminaria digitata. 11 Minor elements (ppm) (after Johnston, 1966) Laminaria digitata frond Laminaria digitata stipe Laminaria hyperborea frond Ascophyllum Fucus spiralis Fucus serratus Fucus vesiculosus Fe Mn 138 293 10 159 283 638 375 221 9 10 27 104 155 116 Cu Zn Mo Co Sr 3-4 5 64 62 0 0·29 0·92 4000 4000 14 1·1-4 6 5-17 3-4-7-4 76 60 62 70 60 0·29 0·29 0·65 0·34 0·25 0·73 1·39 0·84 0·65 2600 2800 because washing, either by rain or artificial means, removes some of the salts and results in false values.
Seaweeds and their Uses by V. J. Chapman O.B.E., M.A., Ph.D. (Cantab.), F.L.S., D. J. Chapman B. Sc., Ph.D.(Cal.), F.L.S. (auth.)