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This article in AJ

  1. Vol. 87 No. 3, p. 415-419
    Received: Apr 13, 1994

    * Corresponding author(s):


Corn Responses to Chloride in Maximum Yield Research

  1. Joseph R. Heckman 
  1. Plant Science Dep., Rutgers Univ., New Brunswick, NJ 08903



Chloride nutrition of corn (Zea mays L.) was investigated to determine if Cl limits production in high-yield environments. Experiments were conducted to evaluate the effects of Cl fertilization on a Freehold sandy loam (fine-loamy, mixed, mesic Typic Hapludults) near Adelphia, NJ, using irrigation and intensive crop production practices. Corn was grown at 107 600 plant ha−1 with equidistant spacing. All plots received 454 kg K ha−1 using KOH, K2SO4, or KC1 to establish five treatments: 0, 50,100, 200, and 400 kg Cl ha−1. Positive responses of corn to added Cl were observed each year. In 1990, the Cl treatments averaged 1.1 Mg ha−1 more grain than the check yield of 11.3 Mg ha−1 (P = 0.08). In 1991, the check yield was 19.0 Mg ha−1 and the response to Cl was linear up to the 400 kg ha−1 rate, which yielded 20.5 Mg ha−1. In 1992, the Cl treatments averaged 0.5 Mg ha−1 more grain than the check yield of 14.5 Mg ha−1 (P = 0.07). Grain yields were positively correlated with increases in ear-leaf Cl concentration. Increases in grain yield were associated with increased ear size. Chloride did not increase stover yield. A linear decrease in incidence of stalk rot with Cl rate was observed in 1992. Results suggest that, when produced in high-yield environments, corn may respond to enhanced levels of Cl nutrition.

Research supported by the New Jersey Agric. Exp. Stn. Project no. D-15-110-3-93 and the Foundation for Agronomic Research.

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