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This article in AJ

  1. Vol. 58 No. 6, p. 618-621
     
    Received: Apr 21, 1966


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doi:10.2134/agronj1966.00021962005800060020x

Relative Efficiency of Broadcast Versus Banded Potassium for Corn1

  1. L. F. Welch,
  2. P. E. Johnson,
  3. G. E. McKibben,
  4. L. V. Boone and
  5. J. W. Pendleton2

Abstract

Abstract

Three experiments were conducted in Illinois to determine the relative efficiency of broadcast versus banded potassium for corn. The pounds of banded K required to obtain a specified corn yield were divided by the pounds of broadcast K required to obtain the same yield. This ratio (banded K/broadcast K) represents the relative efficiency of broadcast K in terms of banded K, with respect to corn yield. Four or 5 rates of broadcast K and 4 rates of banded K, in factorial arrangement, constituted the fertilizer treatments.

Multiple regression equations of the quadratic form were calculated to express yield as a function of broadcast and of banded K. The regression equations account for 77, 81, and 62% of the variation in yield for the Cisne, Bluford, and Belknap soils, respectively. The largest yield increases from added K were 83, 33, and 13% for the three soils.

Less K was required to obtain a given yield when the K was banded than when broadcast. The relative efficiency of broadcast K, as compared to banded K, ranged from 0.33 to 0.88. In some cases, no rate of broadcast K equaled the yield produce.d by a given rate of banded K.

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