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Abstract
The introduction of beneficial organism into soil is one of the present cruzes of applied Mycorrhizal research. Isolation and multiplication of native strains pf AMF (Arbuscular Mycorrhizal fungi) are essential for mass production and tailoring of roots of medicinal cash crops to make them suitable for agricultural soils (Bagyaraj, 1992). Indigenous strains of AM fungi are found to be better colonizers of medicinal plants under pot culturing conditions (Selvaraj, 1989). At present considerable importance is being given to bio-inoculants because of the contemporary sensitivity to environmental pollution and health hazards resulting from the use of chemical fertilizers,Somani et al., (1990). Hence an investigation was carried out for mass multiplication of selected and efficient strains of AMF using Onion (Allium cepa L.) as the host plant and to evaluate the possibility of immobilishing sand:soil inoculum of Am fungus, Gigaspora margarita from infected root segments of Allium cepa along with different carrier materials and also to determine their infectivity and influence of plant growth of Onion under pot culturing conditions.