Iron, manganese; ash and nitrogen in some Plants from salt marsh and shingle habitats

Analyses for Fe, Mn, ash and N are recorded for some plants from salt marshes and shingle hooks. Ash is much higher, and iron and manganese are much lower, than in plants from underwater lake muds, woodland soils of varying humus content and acidity, and semi-aquatic marsh, fen and bog soils. It is suggested that the great total ion concentration of the salt marsh soil solution may depress assimilation of Fe and Mn freely mobile in the soil, through ionic antagonism.