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Relative Effect of Vesicular-Arbuscular Mycorrhizal Fungi on the Growth and Yield of Soybeans¹

ABSTRACT

The growth and yield response of greenhouse-grown soybean plants to colonization by 19 isolates (including 6 Glomus and 3 Gigaspora species) of vesicular-arbuscular mycorrhizal fungi is reported. Each isolate was evaluated in a high (169 kg/ha Bray-I P₂O₅) and a low (50 kg/ha Bray-I P₂O₅) fertility soil. Colonization by most Glomus isolates significantly increased plant top dry weight and seed yields, and of these isolates most produced larger increases in dry weight in the low fertility soil. Colonization by five of the Gigaspora isolates did not significantly affect top dry weight and seed yield in the high or Iow fertility soil. The value of comparative testing of species is discussed.

¹ Contribution of the Missouri Agric. Exp. Stn. Approved by the Director as Journal Paper no. 8366. This study was supported by USDA Research Grant no. 416-15-80.

² Plant Pathologist, Virginia Truck & Ornamentals Res. Stn., 1444 Diamond Springs Road, Virginia Beach, VA 23455; and Professor, Dep. of Plant Pathology, Univ. of Missouri, Columbia, MO 65201.