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Published online 1 March 1990
Published in Agron J 82:302-304 (1990)
© 1990 American Society of Agronomy
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Nutrition of Mycorrhizal Soybean Evaluated by the Diagnosis and Recommendation Integrated System (DRIS)

Gabor J. Bethlenfalvay*, Raymond L. Franson and Milford S. Brown

USDA-ARS, Western Regional Research Center, Albany, CA 94710

* Corresponding author.

Colonization of roots by vesicular-arbuscular mycorrhizal (VAM) fungi affects host-plant growth and nutrition, but standard methods to evaluate VAM effects are lacking. The Diagnosis and Recommendation Integrated Syslem (DRIS) may serve this purpose, and an analysis of mycorrhiza-mediated nutrient-uptake effects on soybean [Glycine max L.) M'err. CY. Hobbit) plants by DRIS is presented. Plants were grown either colonized by one of three geographical isolates of the VAM fungus Glomus mosseae (Nicol & Gerd) Gerd and Trappe or as nonVAM controls in a nutrient-deficient soil. Plant development and nutritional status differed among the treatments. Analysis by DWS confirmed that N, P, and K were limiting, and established different rankings in the degree of deficiency for each nutrient. Nitrogen was least limiting in all four treatments and K or P were most limiting in each of two treatments. The analysis permitted a ranking of the G. mosseae isolates as to their effects on the uptake of each nutrienl. Evaluation of VAM-mediated nutrientuptake effects by DRIS and by nutrient-dilution and concentration analyses could become useful in the selection of specific VAM fungal isolates for their specific crop responses.

Contribution from the Plant-Soil Symbiosis Group, Plant Development-Productivity Unit, WRRC.

Received for publication February 9, 1989.




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