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The capacities of two arbuscular mycorrhizal (AM) fungi, Glomus mosseae and Glomus versderme, torrrrrrrrrnmineralize added organic P were studied in a sterilized calcareous soil. Mycorrhizal (inoculated with eitherrrrrrrrrrnof the AM fungi) and non-mycorrhizal red clover (Trghlium pmtense L.) plants were grown for eight weeksrrrrrrrrrnin pots with upper root, central hyphal and lower soil compartments. The hyphal and soil compartmentsrrrrrrrrrnreceived either organic P (as Na-phytate) or inorganic P (as KH2PO4) at tbe rate of 50 mg P kg-1. No P wasrrrrrrrrrnadded to the root compartments. Control pots received no added P. Yields were higher in mycorrhizal than inrrrrrrrrrnnon-mycorrhizal clover. Mycorrhizal inoculation doubled shoot P concentration and more than doubled totalrrrrrrrrrnP uptake of plaflts in P-amended soil, irrespective of the form of applied P. The mycorrhizal contributionrrrrrrrrrnto inorganic P uptake was 80% or 76% in plants inoculated with G. mosseae or G. verefforme, respectively.rrrrrrrrrnCorresponding va1ues were 74% and 82% when Na-phytate was a
The capacities of two arbuscular mycorrhizal (AM) fungi, Glomus mosseae and Glomus versderme, to r r r r r r r r r r r r nm (inoculated with either r r r r r r r r n of the AM fungi) and non-mycorrhizal red clover (Trghlium pmtense L.) plants were grown for eight weeks r r r r r r r r r n pots with upper root, central hyphal and lower soil compartments. The hyphal and soil compartments r r r r r r r r nreceived either organic P (as Na-phytate) or inorganic P (as KH2PO4) at tbe rate of 50 mg P kg-1. No P was r r r r r r r r nadded to the root compartments. Control pots received no added P. Yields were higher in mycorrhizal than in r r r r r r r r r nnon-mycorrhizal clover. Mycorrhizal inoculation doubled shoot P concentration and more than doubled total r r r r r r r r nP uptake of plaflts in P-amended soil, irrespective of the form of applied P. The mycorrhizal contribution r r r r r r r r r nto inorg anic P uptake was 80% or 76% in plants inoculated with G. mosseae or G. verefforme, respectively. r r r r r r r r nCorresponding va1ues were 74% and 82% when Na-phytate was a