The potential for Pythium species to reduce sainfoin (Onobrychis viciifolia) seedling growth and for rhizobia and vesicular-arbuscular (VA) mycorrhizal fungi to enhance seedling growth were studied under controlled conditions. Seedling emergence and shoot dry weights of cvs. Nova and Melrose in pasteurized soils infested with each of 18 isolates of Pythium spp. were reduced. Seedlings inoculated with arctic rhizobia grew more rapidly than noninoculated seedlings. Plant growth, nodule dry weight, nitrogenase activity, and mycorrhizal colonization of sainfoin dually inoculated with Rhizobium plus either Glomus fasciculatus or G. intraradices were greater than those of uninoculated plants or those inoculated with either rhizobia or mycorrhizal fungus alone; nitrogen content was higher in plants concomitantly inoculated with Rhizobium plus G. intraradices
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Sheau‐Fang Hwang (1993) studied this question.