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This article in SSSAJ

  1. Vol. 56 No. 1, p. 141-148
     
    Received: Nov 2, 1990
    Published: Jan, 1992


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doi:10.2136/sssaj1992.03615995005600010022x

Potassium Accumulation and Corn Yield Related to Potassium Fertilizer Rate and Placement

  1. J. R. Heckman * and
  2. E. J. Kamprath
  1. Crop Science Dep., Rutgers Univ., New Brunswick, N.J. 08903
    Soil Science Dep., North Carolina State Univ., Box 7619, Raleigh, NC 17695-7619. This research was supported by the North Carolina Agricultural Research Service and the Potash and Phosphate Inst.

Abstract

Abstract

Sandy Coastal Plain soils have relatively low reserves of K and may not be able to supply adequate K for intensive corn (Zea mays L.) production. Field experiments were conducted on Dothan loamy sand (fine-loamy, siliceous, thermic Plinthic Paleudult) for 3 y to determine K fertilizer rate and placement effects on corn growth and seasonal K accumulation. Treatments were 0, 56, 112, 168, and 224 kg K ha-1 broadcast and 56 kg K ha-1 banded plus 0, 56, 112, and 168 kg K ha-1 broadcast. Total K accumulation was increased by K fertilization rate each year. Method of application had a significant effect in a relatively dry year when the broadcast-plus-banded treatments resulted in greater K accumulation. Stover dry matter was increased in two of three years with 56 kg K ha-1, but grain yield was increased in only one year. Yield increased linearly with K rates up to 112 kg K ha-1 when the initial exchangeable-K level was 0.21 cmol L-1. Critical exchangeable-K level was 0.35 cmol L-1 and the critical soil solution K concentration was 0.48 mmol L-1 for dry-matter yield. When corn is grown with intensive production practices, there is little benefit in applying banded K with broadcast K on sandy soils testing high in K.

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