soybean ( glycine max [ l. ] merr . cv hobbit ) plants were grown in a growth chamber for 56 days in a phosphorus- and nitrogen-deficient soil and were colonized by the vesicular-arbuscular mycorrhizal ( vam ) fungus glomus mosseae ( nicol . & gerd ) gerd . and trappe and rhizobium japonicum strain usda 136 , or by either organism alone , or by neither .
C0016832
fungus
C0029235
organism