Abstract
Abstract Nodulating and nonnodulating isolines of soybean (Glycine max Merr ‘Clay') were grown in sand culture in a greenhouse. The plants were cultured with or without mycorrhizal (Glomus mosseae) infection, and nodulating plants were inoculated with Rhizobium iaponicum. Phosphorous was supplied as hydroxyapatite or dicalcium phosphate with N nutrition from nitrate or as combinations of nitrate and ammonium or nitrate and urea. Best growth of the nodulating isoline was with urea nutrition. Best growth with the nonnodulating isoline was with ammonium nutrition. Urea‐treated nodulating plants showed increased growth due to mycorrhizae. Urea‐treated or ammonium‐treated nonnodulating plants showed growth increases due to mycorrhizae. Nitrate‐treated plants did not show increased growth due to mycorrhizae. Mycorrhizal infection was greatest with urea nutrition, and the infection increased the tissue N content of these plants relative to nonmycorrhizal plants. Enhancement of tissue P accumulation through mycor...
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