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This article in CS

  1. Vol. 19 No. 5, p. 719-722
    Received: Dec 20, 1978

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Screening Soybeans for Drought Resistance. II. Drought Box Procedure1

  1. D. J. Sammons,
  2. D. B. Peters and
  3. T. Hymowitz2



The effects of progressively increasing soil moisture stress on soybean (Glycine max (L.) Merr.) plant growth rate (PGR) and leaf lamina expansion rate (LER) were studied in a greenhouse experiment. Twenty cultivars were observed through a 30-day drought period in an effort to identify differences in drought response. Cultivars were classified as drought resistant, intermediate, or drought susceptible for each variable based on their individual response to soil moisture stress relative to the average response measured for all the cultivars in the study. Analysis of the pooled data indicated that PGR and LER were dramatically decreased under the severe soil moisture stress encountered late in the droughting period. An overall estimate of cultivar performance under drought based on this procedure suggested that one cultivar (‘Grant’) is drought resistant and two (‘Manitoba Brown’ and ‘Pagoda’) are drought susceptible. Although the results supported the hypothesis that soybean cultivars in this study differ in vegetative response to the imposed drought period, the procedure appeared to be more conservative than others cited in measuring cultivar performance under soil moisture stress since most cultivars fell into an intermediate group. Comparison of the results of this study to those of two independent studies suggests the desirability of further testing of the material in the field to fully characterize individual cultivar differences in drought resistance.

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