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No-tillage Advantages for Soybean Seed Quality During Drought Stress¹

Seed quality can be affected by soil and climatic conditions. The availability of soil water can be enhanced under no-tillage. Under drought stress this can result in a more vigorous plant and production of higher quality seed.

Soybean [Glycine max (L.) Merr. ‘Forrest’] seed quality was evaluated in an experiment comparing no-tillage, and five conventional tillage methods ranging from disking 10 cm deep to under-row subsoiling 25 cm deep. The methods were studied on a Lexington silt loam (fine-silty, mixed, thermic, Typic Paleundalfs) in 1979 and 1980.

No-tillage soybeans were of higher quality in the dry season of 1980 as compared to conventional methods. Seed from no-tillage had significantly less purple stain [Cercospora kikuchii (T. Matsu. and Tomoyaso) Chupp.] and wrinkled seed coats. Seed germination, weight, density, and yield were also superior in no-tillage as compared to conventional methods. Soil water availability was also higher in notillage due to water conservation by the surface mulch.

Higher seed quality in no-tillage could have resulted from greater soil water availability and reduced soil splash of purple stain organisms.

Key Words: Purple stain • Cercospora kikuchii (T. Matsu. and Tomoyaso) Chupp. • Wrinkled seed coats • Soil water • (Glycine max [L.] Merr.)

² Assistant professor and associate professor, Dep. of Plant and Soil Science, West Tennessee Exp. Stn., Jackson, TN 38301.

Received for publication May 29, 1981.

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