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This article in AJ

  1. Vol. 105 No. 3, p. 783-795
    OPEN ACCESS
     
    Received: Dec 1, 2012
    Published: April 2, 2013


    * Corresponding author(s): Ignacio@Ciampitti.com
    iciampit@purdue.edu
    tvyn@purdue.edu
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doi:10.2134/agronj2012.0467

Maize Nutrient Accumulation and Partitioning in Response to Plant Density and Nitrogen Rate: I. Macronutrients

  1. Ignacio A. Ciampitti *a,
  2. Jim J. Camberatoa,
  3. Scott T. Murrellb and
  4. Tony J. Vyn *a
  1. a Agronomy Dep., Purdue Univ., 915 W. State St., West Lafayette, IN 47907-2054
    b International Plant Nutrition Institute, North America–North Central, 1851 Secretariat Dr., West Lafayette, IN 47906-2054

Abstract

Understanding nutrient balances in changing cropping systems is critical to appropriately adjust agronomic recommendations and inform breeding efforts to increase nutrient efficiencies. Research to determine the season-long P, K, and S uptake and partitioning dynamics in maize (Zea mays L.) as affected by low, medium, and high plant density (PD) and N rate factors and their interactions was conducted over four site-years in Indiana. Plant nutrient contents at maturity responded predominantly to N rate. Relative nutrient contents at silking compared with those at maturity were 47% for P, 100% for K, and 58% for S. Concentrations of P, K, and S varied less in leaf vs. stem (vegetative stage) and in ear vs. shoot (reproductive stage). Equivalent stoichiometric ratios were documented for N and S partitioning in leaf, stem, and ear components. The PD and N rate treatments did not modify P, K, and S nutrient partitioning to plant components during vegetative or reproductive periods (except for an N rate effect on leaf vs. stem P partitioning). Near silking, relative nutrient partitioning to the ear followed the order P > S > K. This mimicked the nutrient harvest indices observed at maturity, suggesting genetic modulation. Ratios of N to P, K, and S in whole-plant tissues were influenced by N content changes in response to N rate but not by PD. As the season progressed, PD and N rates changed the absolute P, K, and S quantities (primarily reflecting biomass responses) but had little influence on nutrient ratios.

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Copyright © 2013. Copyright © 2013 by the American Society of Agronomy, Inc.

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