Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 November 1966
Published in Agron J 58:618-621 (1966)
© 1966 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Relative Efficiency of Broadcast Versus Banded Potassium for Corn1

L. F. Welch, P. E. Johnson, G. E. McKibben, L. V. Boone and J. W. Pendleton2

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.

1 Contribution from the Agronomy Department, University of Illinois, Urbana, Illinois

2 Associate Professor of Soil Fertility, Assistant Professor of Soil Fertility, Associate Professor of Soil Fertility, Assistant in Soil Fertility, and Professor of Agronomy, respectively.

Received for publication April 21, 1966.




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Copyright © 1966 by the American Society of Agronomy.