Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 November 1982
Published in Agron J 74:1067-1070 (1982)
© 1982 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Tillage Effects on Soybean Nodulation, N2(C2H4) Fixation, and Seed Yield1

W. C. Lindemann, G. W. Randall and G. E. Ham2

Previously, tillage has been shown to affect the yield of soybeans in southern Minnesota. The objective of this study was to determine if different tillage treatments also affected soybean nodulation and N2(C2H4) fixation. Six tillage treatments were sampled in 1975, 1976, and 1977 for nodulation and acetylene reduction activity. The six tillage treatments were part of a 12 tillage treatment experiment established in 1973 under a corn-soybean rotation system on a Webster clay loam soil (fine-loamy, mixed, mesic Typic Haplaquoll). Yield was significantly affected by tillage treatment with the yield of the no-till treatment averaging 22% less than the other five tillage treatments. Few differences were noted in nodule number, nodule weight, or total acetylene reduction activity with respect to tillage treatment. Fall tillage tended to increase nodulation and acetylene reduction over spring tillage, but differences were small. Yield differences due to tillage practice were not attributed to changes in the N2-fixation system of soybeans.

Key Words: Acetylene reduction • Glycine max • Nodules

1 Contribution from the Dep. Soil Science, Univ. of Minnesota, St. Paul, MN, 55108. Paper No. 12083 Scientific Journal Series, Minn. Agric. Exp. Stn.

2 Former graduate assistant (now assistant professor, Dep. of Agronomy, New Mexico State University), professor, Univ. of Minn., Southern Exp. Stn., Waseca, MN, and former professor (now head, Dep. of Agronomy, Kansas State Univ.)

Received for publication February 16, 1982.




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