01962nas a2200145   4500008004100000245012100041210006900162300001300231490000800244520138500252100001501637700002001652700001701672856012701689       1988                        eng d00aRelationships of soil fertility to suppression of the growth response of mycorrhizal big bluestem in nonsterile soil0 aRelationships of soil fertility to suppression of the growth res  a473 -4820 v1093 a<p>When growth of vesicular-arbuscular (VA) mycorrhizal and non-mycorrhizal big bluestem was evaluated in 15 soils, three different growth response groups were evident. Group one, which included the prairie soils, displayed high mycorrhizal dependency as well as significant suppression of plant growth in non- sterile soil. Group two showed no mycorrhizal dependency; however, plant growth was suppressed in non- sterile soil. The last group exhibited no mycorrhizal dependency or suppression in non-sterile soil. Mycorrhizal dependency of big bluestem was not highly correlated with any individual soil parameter; however, concentrations of soil K, Ca, Cu, and Fe were used to successfully classify &quot;high&quot; and &quot;low&quot; mycorrhizal dependency. Suppression of plant growth in non-sterile soil was also related to soil fertility. The magnitude of non-sterile suppression was described by equations using soil Na, Zn, Mn, organic matter, Mg, and NH4. The mechanism of this suppression is still unclear; however, the nutrients which predict suppression may be related to the development of mycorrhizal symbiosis or in demand by plants and other microbes, while those nutrients which predict mycorrhizal dependency may be related to those supplied to the plant by the symbiosis. Key words: Glomus etunicatum, mycorrhial ependency, vesicular-arbuscular mycorrhizas</p>1 aKitt, D.G.1 aHetrick, B.A.D.1 aWilson, G.T.  uhttp://129.130.186.12/content/relationships-soil-fertility-suppression-growth-response-mycorrhizal-big-bluestem-nonsterile