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Published online 1 July 1972
Published in Agron J 64:550-552 (1972)
© 1972 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Growth and Composition Responses of Soybeans to Some Growth Regulators1

B. S. Basnet, G. M. Paulsen and C. D. Nickell2

Some growth regulators studied for morphological and yield effects on soybeans [Glycine max (L.) Merr.] have not been studied for chemical compositional effects, particularly under Great Plains conditions. The objective of this study was to compare morphological aud mature seed compositional responses of 11 growth regulators.

Eleven growth regulators of various modes of action were applied at two rates to foliage of soybeaus at one-tenth bloom stage to study their effects on plant growth and seed composition. The desired rate of each growth regulator was applied in 1 liter of water containing 0.02% (v/v) polyoxyethylene sorbitol monolaurate as a surfactant per plot.

Morphological characteristics responded more than did the chemical constituents, oil and protein, to the growth regulators. Responses were changes in the node number subtending the first pod, number of branches, and number of pods per plant. The antiauxin triiodobenzoic acid reduced plant height, node number, and node number subtending first pod; and increased branching and pod set. None of the growth regulators, however, increased yield when compared to no treatment. Although none of the regulators appeared useful by itself for commercial soybean production, some might have a role under stress conditions or combined with other regulators.

Key Words: Plant hormones • Auxins • Anti-auxins • Oil • Protein

1 Contribution no. 1170, Department of Agronomy, Kansas Agr. Exp. Sta.

2 Graduate Research Assistant, Associate Professor, and Assistant Professor, respectively, Department of Agronomy, Kansas State University, Manhattan 66502.

Received for publication December 18, 1971.




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Copyright © 1972 by the American Society of Agronomy.