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This article in AJ

  1. Vol. 100 No. 6, p. 1662-1665
    Received: Jan 9, 2008

    * Corresponding author(s): wjc3@cornell.edu
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Planting Date and Seed Treatment Effects on Soybean in the Northeastern United States

  1. William J. Cox *a,
  2. Elson Shieldsb and
  3. Jerome H. Cherneya
  1. a Dep. of Crop and Soil Sci
    b Dep. of Entomology, Cornell Univ., Ithaca, NY 14853


Soybean [Glycine max (L.) Merr.] production is limited in the northeastern United States so research on optimum planting date is scarce. Soybean production in this region may increase because of biodiesel demand so we initiated a 2-yr study in New York that compared soybean planting dates with and without seed-applied fungicide/insecticide treatments. Soybean planted in mid- compared with late May had a longer emergence time (15 and 6 d) and lower plant densities (35.6 and 39.5 plants m−2), but produced more pods side branch−1 (7.4 and 5.5), which contributed to more pods plant−1 (30.9 and 25.7) and pods m−2 (1079 and 958, respectively). The late compared with mid-May planting date, however, had more seeds pod−1 (2.28 and 2.19), which contributed to similar seeds m−2 (2180 and 2357) and seed yield (3.8 and 3.9 Mg ha−1, respectively). Soybean planted in mid-June compared with mid-May had more plants m−2 (38.0) but fewer pods side branch−1 (3.4), pods plant−1 (22.5), pods m−2 (879), seeds m−2 (1 910), and lower seed yield (3.5 Mg ha−1). Seed treatments did not affect plant density, pod density, and seed yield, but had inconsistent effects on seeds pod−1, seeds m−2, and seed mass. The results of this study indicate that there is a fairly broad optimum planting date range and that insecticide/fungicide seed treatment is not required for soybean production in the northeastern United States, but more research is necessary to corroborate these findings.

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Copyright © 2008. American Society of AgronomyCopyright © 2008 by the American Society of Agronomy