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Effects of Defoliation and Stem Bruising on Soybeans¹

Investigations were conducted to determine the effects of (a) early defoliation on soybeans from emergence through stage 1 and (b) various degrees of stem bruising and defoliation individually and combined.

Data from early defoliation indicated that at least one cotyledon was essential for maximum yield after emergence and, in the absence of the unifoliolate leaves the cotyledons were of value 12 days after emergence. Cut-off below the unifoliolates and complete defoliation at stage 1 treatments indicated the great recuperative ability of soybean plants.

The bruising and defoliation experiment indicated that bruising and defoliation were interrelated in producing yield loss in soybeans. Stem breakage resulted from the severity and location of the stem bruise, and to the amount of defoliation. Bruising was more important than breakage in causing yield loss.

² Agronomist, Crops Research Division, USDA, and Professor, Iowa State University, Ames, Iowa; and Agronomist, Crops Research Division, Beltsville, Md., respectively.

Received for publication June 26, 1965.

This article has been cited by other articles:

				J. A. Coulter and E. D. Nafziger Yield and Agronomic Responses of Soybean to Cotyledon and Unifoliolate Node Removal Crop Sci., January 16, 2008; 48(1): 353 - 356. [Abstract] [Full Text] [PDF]