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This article in SSSAJ

  1. Vol. 41 No. 3, p. 562-567
     
    Received: May 19, 1976
    Published: May, 1977


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doi:10.2136/sssaj1977.03615995004100030028x

Nitrogen Fertilization I. Nitrate Accumulation and Losses Under Continuous Corn Cropping1

  1. H. C. H. Hahne,
  2. Wybe Kroontje and
  3. J. A. Lutz2

Abstract

Abstract

Selected treatments were chosen from three field experiments with corn (Zea mays L.) to determine effects of N rates on the vertical distribution of nitrates in the soil. The experiments were located on three different soil types and corn was grown for 5 consecutive years. Irrigation was a variable in two of the experiments.

Appreciable amounts of NO3-N accumulated in the soils when the optimum rate of 140 kg N/ha at Blacksburg and Charlotte Courthouse and 168 kg N/ha at Orange had been exceeded. Amounts of vertical distributions of NO3-N accumulations were highly dependent on soil type, and on amounts of irrigation and rainfall. Lowest NO3-N accumulations and highest NO3-N losses were encountered in the Cecil fsl. An increase in NO3-N was found in the Davidson clay loam whereas no loss or gain was observed in the Groseclose silt loam.

Irrigation markedly reduced the maximum NO3-N accumulation in the Davidson clay loam especially in the 120 to 195-cm depth. Irrigation on the Cecil fine sandy loam had less influence on NO3-N and hardly affected the spread of the accumulation zone. The data indicated that proper irrigation of soils with high internal drainage can markedly reduce NO3-N loss through leaching; the reduction in NO3-N loss in the Cecil fine sandy loam was from 48 to 5% at near optimum N rate of application.

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