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Published in Crop Sci 18:1043-1045 (1978)
© 1978 Crop Science Society of America
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Effect of Inoculation with Azospirillum and Azotobacter on Tuff-type Bermuda Genotypes1

A. A. Baltensperger, S. C. Schank, Rex L. Smith, R. C. Littell, J. H. Bouton and A. E. Dudeck2

Eight selected bermudagrass (Cynodon dactylon L. Pers.) genotypes were inoculated with a mixed culture of the N2-fixing bacteria, Azospirillum and Azotobacter, to determine plant growth response to inoculation under greenhouse conditions. Top, crown, and root growth and N content were measured. At low N fertility, top growth was increased 17% as a result of inoculation. Inoculation also resulted in increased total N accumulation in the top growth. Crown and root growth was not increased by inoculation and total dry weight of all plant parts was not significantly increased. The high fertility treatments gave significantly higher clipping yields, as ex. pected, but no significant differences were observed between the inoculation treatments. No leaf color differences were observed as a result of inoculation. Bermudagrass genotypes were not significantly different in response to inoculation treatments.

Key Words: N-fixing bacteria • N content • Dry matter yield • Cynodon dactylonL. Pers

1 Journal article 663, Agric. Exp. Stn., New Mexico State Univ., Las Cruces, NM 88003. The research was conducted in cooperation with the Univ. of Florida Institute of Food and Agric. Sci., Gainesville, FL 32611. The work was conducted while the senior author was on leave at the Univ. of Florida, and it was partially supported by USAID Contract ta-C-1376.

2 Professor of agronomy, New Mexico State Univ.; professor of agronomy, associate professor of agronomy, associate professor of statistics, former research associate in agronomy (now assistant professor of agronomy, Univ. of Georgia, Athens, GA 30602), and associate professor of ornamental horticulture, IFAS, Univ. of Florida, respectively.

Received for publication March 6, 1978.




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