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This article in AJ

  1. Vol. 63 No. 1, p. 119-123
     
    Received: June 11, 1970
    Published: Jan, 1971


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doi:10.2134/agronj1971.00021962006300010037x

Corn Yields with Fall, Spring, and Sidedress Nitrogen1

  1. L. F. Welch,
  2. D. L. Mulvaney,
  3. M. G. Oldham,
  4. L. V. Boone and
  5. J. W. Pendleton2

Abstract

Abstract

Studies in central and northern Illinois at 4 locations and 12 location-years were conducted with 5 rates of N applied in the fall and as spring-preplant. Sidedress N was also included at 1 of the 4 locations for 4 years. Relative efficiency of the times of application was calculated by dividing the corn (Zea mays L.) yield increase from a given rate of N added at one time by the yield increase from the same rate of N applied at another time.

At the Carthage and Hartsburg locations the 3-year average relative efficiencies of fall- versus spring-applied N are about 0.8 and 0.9 (fall was 80 and 90% as effective as spring) at N rates of 67 and 134 kg/ha, respectively. Fall and spring N were about equally effective at 201 and 268 kg/ha of N. There was generally little yield response to N rates greater than 201 kg/ha at Carthage and Hartsburg. Fall and spring N gave similar corn yields for all rates of N at Urbana.

For the 4-year average at DeKalb, sidedress N was the most effective, spring N was intermediate, and fall-applied N was the least effective. The difference between spring and sidedress N was less than that between fall and spring N.

There was considerable year-to-year variation in relative efficiency. The importance of the time at which conditions suitable for N loss occur is discussed.

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