Excretion from Plant Roots


THIS subject, discussed at intervals over the greater part of a century, has been recently revived. Mr. Pickering has suggested that the effect produced by one plant on another is probably due to the indirect action of bacteria. Dr. Russell attributes it to chemical changes in the soil, whilst Schreiner and Reed in America (Bulletin of the Torrey Botanical Club, June) and Mr. Fletcher in India have described experiments tending to show that some deleterious substance is excreted from the root. The questions incidentally raised by these several experimenters are not all identical, because, as Mr. Pickering points out, his work has to do with initial stages of growth, while that of others relates to subsequent development.

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