The Manurial Value of Seaweed

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Abstract
The use of seaweed products as manure is discussed with reference to nutrient content, the presence of compounds known to affect plant growth or the physical condition of the soil and the effect of algal chemicals on plant diseases. The recent discovery that chitin, laminarin and seaweed have a mycolytic effect on certain phytopathogenic fungi, together with the failure of analytical methods to explain the nutritional value of organic manures, has revived interest in the biochemical study of the traditional manures. Certain agricultural research which appears to be related to some of the research on seaweed is also included.