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Plant Density and Defoliation Effects on the Recovery of Soybean Injured by Stem Cutoff During Vegetative Development

Dep. of Agronomy, Iowa State Univ., Ames, IA 50011

^* Corresponding author.

The current procedure for assessing the yield loss of soybean (Glycine max (L.) Merr.] caused by defoliation and stem cutoff does not take into account plant density. This study was conducted to determine the effects of plant density on the recovery of soybean injured by defoliation and stem cutoff during vegetative development. Plots were established during 2 yr at plant densities of 119 600, 191 300, 239 200, 310 900, and 382 700 plants ha^–1. Treatments imposed on each of the five densities at stages V3 and V6 consisted of a factorial arrangement of 33 and 66% removal of the main stem with 0 and 100% defoliation. The stage of development at which treatments were imposed and the plant density of treated plots had no significant effect on percentage yield reduction. The results indicated that plant density is not an important factor when assessing yield loss of soybean from plant injury during vegetative development.

Received for publication December 14, 1988.

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