About Us | Help Videos | Contact Us | Subscriptions

Members of ASA, CSSA, and SSSA: Due to system upgrades, your subscriptions in the digital library will be unavailable from May 15th to May 22nd. We apologize for any inconvenience this may cause, and thank you for your patience. If you have any questions, please call our membership department at 608-273-8080.


Institutional Subscribers: Institutional subscription access will not be interrupted for existing subscribers who have access via IP authentication, though new subscriptions or changes will not be available during the upgrade period. For questions, please email us at: queries@dl.sciencesocieties.org or call Danielle Lynch: 608-268-4976.



This article in AJ

  1. Vol. 102 No. 4, p. 1238-1243
    Received: Feb 2, 2010

    * Corresponding author(s): wjc3@cornell.edu
Request Permissions


Soybeans Compensate at Low Seeding Rates but not at High Thinning Rates

  1. W. J. Cox *a,
  2. J. H. Cherneya and
  3. E. Shieldsb
  1. a Dep. of Crop and Soil Sciences
    b Dep. of Entomology; Cornell Univ., Ithaca, NY 14853


Soybean [Glycine max (L.) Merr.] seed costs have more than tripled, so high seeding rates are expensive insurance against poor emergence associated with planting conditions or pest damage to established plant stands. Drilled soybeans (0.19 m spacing) were evaluated in New York (NY) in 2006 and 2007 at three seeding (358,000; 469,000; and 580,000 seeds ha−1) and four thinning rates (0, 10, 25, and 50% at the sixth node stage) to determine if yields can be maintained at lower seeding rates. Soybean plants responded linearly to seeding rates with 20% more grams of biomass, 0.9 more side branches, 21% more pods, and 21% more seeds plant−1 at 358,000 seeds ha−1 vs. the recommended 469,000 seeds ha−1 (21.1 g, 1.4 side branches, 30.6 pods, and 70.1 seeds plant−1), resulting in similar biomass accumulation (∼555 g m−2) during seed development (∼R5 stage), pod density (817 vs. 805 m−2), and seed density (1883 vs. 1816 m−2, respectively). Seeds pod−1 (∼2.30) and seed mass (∼170 mg) did not vary and all seeding rates yielded similarly (∼3.1 Mg ha−1). Thinning rates resulted in linear reductions in biomass accumulation and pod density with no effect on seeds pod−1 or seed mass. Thinning reduced yields linearly (3.3 Mg ha−1 for no-thinning and 2.8 Mg ha−1 for 50% thinning). Seeding by thinning rate interactions were not observed so plant density reductions after stand establishment posed no greater risk at lower seeding rates. Growers who drill soybeans in the northeastern United States should consider lower seeding rates.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © 2010. American Society of AgronomyCopyright © 2010 by the American Society of Agronomy