Harrison, A. F.; Helliwell, D. R.. 1973 Assessment of the availability of phosphate in soils by measurement of phosphate stress in seedlings of sycamore (Acer pseudoplatanus L.) and birch (Betula verrucosa Ehrh.) using P32 phosphorus. Grange-over-Sands, Institute of Terrestrial Ecology, 14pp. (Merlewood Research and Development Paper No.52) (Unpublished)
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