Abstract
Inositol phosphate is at least equal to KH2PO4 as a source of P for the growth of lupins in sand but a much poorer source in soil. RNA and glycerophosphate were excellent sources of P for lupin growth in a P-fixing soil. Soil and root phosphatase activity were not altered by amendment of soils with either inorganic- or organic-P. The difference in availability of differing P-sources is related to their solubility in soils rather than susceptibility to phosphatases.
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Adams, M.A., Pate, J.S. Availability of organic and inorganic forms of phosphorus to lupins (Lupinus spp.). Plant Soil 145, 107–113 (1992). https://doi.org/10.1007/BF00009546
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DOI: https://doi.org/10.1007/BF00009546