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This article in AJ

  1. Vol. 74 No. 1, p. 161-163
     
    Received: Feb 5, 1981
    Published: Jan, 1982


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doi:10.2134/agronj1982.00021962007400010046x

Effect of N Fertilizer and Corn Residue Management on Organic Matter in Minnesota Mollisols1

  1. P. R. Bloom,
  2. W. M. Schuh,
  3. G. L. Malzer,
  4. W. W. Nelson and
  5. S. D. Evans2

Abstract

Abstract

Two long-term continuous corn (Zea mays L.) experiments were used to determine the effect of the rate of stover return on soil organic matter in high organic matter mollisols (O.C. > 2.4%). One experiment was an N rate experiment which had been cropped for 19 years. The other was a stover-fertility management study which had been cropped for 13 years in which there were two stover management treatments: total removal and plowdown, both at high and low fertility. In the N rate experiment a 3-ton ha−1 yr−1 difference in stover yield between the low and high N rates resulted in a 4.5% less organic carbon content for the lower N rate after 19 years. All of the treatments in the stover management study had no significant changes in organic matter content after 13 years except for the low fertility-stover removal treatment which had 15% less organic carbon. It was concluded that for precise estimates of treatment effects on organic carbon loss in mollisols, longer treatment times are needed.

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