Tillage Effects on Soybean Nodulation, N2(C2H4) Fixation, and Seed Yield
1982
Lindemann, W. C. | Randall, G. W. | Ham, G. E.
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.
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