VIEW ARTICLE

Effect of Endogone Mycorrhiza on Soybean Yields. J. P. Ross, Plant Pathologist, Crops Research Division, ARS, USDA, P.O. Box 5397, Raleigh, North Carolina 27607; J. A. Harper, Agricultural Research Technician, Crops Research Division, ARS, USDA, P.O. Box 5397, Raleigh, North Carolina 27607. Phytopathology 60:1552-1556. Accepted for publication 18 May 1970. DOI: 10.1094/Phyto-60-1552.

Growth and yield of soybean plants growing in previously fumigated small isolated plots were increased 34-40% in the presence of a chlamydosporic species of the vesicular-arbuscular mycorrhizal fungus Endogone. Inoculum for these plots was produced by culturing Endogone monoxenically on soybean roots to assure the absence of other soil microorganisms. Mycorrhizal plants accumulated greater amounts of P, N, Ca, Cu, and Mn in their foliage than nonmycorrhizal plants. Infesting previously fumigated field plots with Endogone resulted in yield increases of 29% over fumigated-noninfested plots. This effect did not occur in nonfumigated soil.