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This article in AJ

  1. Vol. 66 No. 3, p. 409-412
     
    Received: Oct 11, 1973


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doi:10.2134/agronj1974.00021962006600030022x

Response of Three Soybean Strains to Equidistant Spacings1

  1. J. R. Wilcox2

Abstract

Abstract

Three soybean [Glycine max (L.) Merr.] strains were evaluated in approximately equidistant spacings at 14 population densities ranging from 25,000 to 582,000 plants/ha (10,000 to 236,000 plants/acre) over a 2-year period. The objective was to determine the response of the strains to a wide range of populations at equidistant spacings. Plant height, height of the lowest pod, and lodging increased with increasing plant population. Mature plant weight, seed weight per plant, and the ratio of mature plant to seed weight increased as population decreased. The three strains differed in their response to population density when seed yield was expressed per unit of area. Yields of L15 were most consistent across all populations. Yields of C1421 were most responsive to populations above 281,000/ha, whereas yields of C1477 were most responsive to populations below 83,000/ha. Maximum yields for C1477 and L15 were at 281,000 plants/ha and for C1421 at 456,000 plants/ha. Yield of C1421, which was most sensitive to high populations, did not vary significantly with a 27% increase or decrease in plant population from the optimum. Maturity date and seed size were not affected by changes in population.

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