Growth response of four onion cultivars to several isolates of VA mycorrhizal fungi

Four onion cultivars were grown in sterilised Patumahoe soil and inoculated with 5 different VA mycorrhizal fungi. Three cultivars were then grown in unsterilised Patumahoe and Horotiu soils with 6 different mycorrhizal inoculants. Mycorrhizal fungi greatly stimulated onion growth and P uptake in sterilised soil and there were very significant fungi × cultivar interactions in both unsterilised soils. Glomus spp. and F 20 were the most efficient inoculants over all onion cultivars in Patumahoe and Horotiu soils respectively.