Effect of different VAMF on red clover(Trifolium pratense L.) in utilizing organic phosphorus

In order to study the role of VAM hyphae in absorbing phosphorus from organic phosphorus sources,a pot experiment was carried out under the controlled condition.The pot was separated into three compartments:root,hyphal and balk soil compartments.Root compartment was separated from the hyphal compartment by a nylon net with 30 μm in diameter.Red clover were planted in the root compartment inoculated or uninoculated with VAM fungus, Glomus mosseae and Glomus versiforme respectively combined with application of Na phytate or KH 2PO 4 in the hyphal compartments.In control treatments,no phosphorus was added.The results showed that mycorrizal infection significantly increased phosphorus uptake of red clover from different phosphorus sources and growth improved as well.Inorganic phosphorus(KH 2PO 4)had better effect on growth of plants than organic phosphorus(Naphytate).Inoculum of Glomus versiforme was better than that of Glomus mosseae in content of dry weight accumulation. Plant took more phosphorus from than from Na phytate than from KH 2PO 4 when inoculated Glomus mosseae, but plant took more phosphorusthan from KH 2PO 4 when inoculated Goomus versiforme . The results clearly demonstrated that efficiency of VAM hyphae in utilizing of organic phosphorus by red clover.The organic P could improve growth of the plants inoculated with defferent VAMF which could play an important role in direct contribution to plant P nutrition.