The composition of bracken some major- and trace-element constituents.

摘要: Periodic samples of bracken taken during the growing season have shown that concentration major elements (except calcium and sodium) decreases with age in fronds, remains relatively constant rhizomes, whereas trace-element varies widely. Soil type has little effect on mineral composition fronds. Examination three rhizome types revealed no wide differences content elements; pinnules generally contained higher concentrations trace than Comparison results those published elsewhere for moorland plants grown under similar conditions indicates contains rather more potassium less molybdenum.