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Nodule Distribution on Roots of Field-Grown Soybeans in Subsurface Soil Horizons¹

Although much research has been carried out on nodulation and nitrogen fixation of soybeans [Glycine max (L.) Merr.], the majority of field studies have centered on nodules which have developed within the Ap soil horizon. This research provides evidence demonstrating that nodulation does occur to 1 m depth.

Key Words: Glycine max • Nodulation • Nitrogen fixation • Rhizobotany

² Research assistant, Dep. of Agronomy, Cornell Univ.; research geneticist, USDA-ARS, and assistant professor, Dep. of Agronomy and Plant Breeding, Cornell Univ.; former research assistant, Dep. Agronomy, Cornell Univ.; and research assistant, Dep. of Agronomy, Cornell Univ.

Received for publication February 12, 1981.