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This article in CS

  1. Vol. 49 No. 1, p. 281-289
     
    Received: Aug 22, 2007


    * Corresponding author(s): lpurcell@uark.edu
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doi:10.2135/cropsci2007.08.0472

Radiation Interception and Yield Response to Increased Leaflet Number in Early-Maturing Soybean Genotypes

  1. Thomas M. Seversikea,
  2. Larry C. Purcell *b,
  3. Edward Gburc,
  4. Pengyin Chend and
  5. Roy Scotte
  1. a North Carolina State Univ., Dep. of Crop Science, Williams Hall 4411, PO Box 7620, Raleigh, NC 27695-7620
    b Univ. of Arkansas, Dep. of Crop, Soil, and Environmental Sciences, 1366 W. Altheimer Drive, Fayetteville, AR 72704
    c Univ. of Arkansas, Agricultural Statistics Laboratory, Agriculture Annex 101, Fayetteville, AR 72701
    d Univ. of Arkansas, Dep. of Crop, Soil, and Environmental Sciences, 115 Plant Science Building, Fayetteville, AR 72701
    e 5601 Sunnyside Ave., Beltsville, MD 20705

Abstract

Early-maturing soybean [Glycine max (L.) Merr.] cultivars require less irrigation than full-season cultivars and may mature before drought periods most often occur in the midsouthern United States. These cultivars require high plant-population densities for radiation interception and acceptable yields, which increase costs. We hypothesized that seven-leaflet genotypes would have greater leaf area per plant, resulting in more radiation interception and higher yield than near-isogenic three-leaflet genotypes at similar populations. Near-isogenic lines from maturity groups 00 to 1.8 were seeded at rates from 4 to 80 m−2 The fraction of photosynthetically active radiation (PAR) intercepted by plots was measured using digital imagery and used to estimate cumulative intercepted PAR (CIPAR). Although seven-leaflet isolines had greater leaf area per leaf than three-leaflet isolines, leaf area per plant was similar between three- and seven-leaflet isolines because the three-leaflet isolines had a slightly greater number of main-stem leaves than seven-leaflet isolines. Generally, seven-leaflet isolines had 10 to 21% greater CIPAR at populations ≤40 m−2 compared to three-leaflet isolines. At populations ≤20 m−2, seven-leaflet isolines generally had higher yields than three-leaflet isolines, but yields at these low populations were inherently low and agronomically unacceptable.

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