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This article in AJ

  1. Vol. 60 No. 5, p. 477-482
     
    Received: Jan 26, 1968
    Published: Sept, 1968


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doi:10.2134/agronj1968.00021962006000050011x

Residual Nitrate Nitrogen in Fertilized Deep Loess-Derived Soils1

  1. G. M. Herron,
  2. G. L. Terman,
  3. A. F. Dreier and
  4. R. A. Olson2

Asbtract

Asbtract

Distributions of NO3-N were studied in deep loess-derived profiles of Sharpsburg silty clay loam and Hastings-Crete silt loams cropped to irrigated corn (Zea mays L.) in eastern Nebraska. Only with soils very high in N and high applications of fertilizer N was there any indication of appreciable leaching of NO3-N below 180 cm in the profiles. Most of the water or KCI-extractable N was usually found in the surface 0-90 cm of soil. High correlations were found (r > 0.9) for a given soil site between amounts of NO3-N in the surface 30 cm and totals to 180 cm. However, the proportion found in the surface soil varied widely among years and sites. At a given site there was a high correlation between NO3-N in the profiles in the fall after harvest and corn yields without applied N the following year. Simple correlations of profile NO3-N with percentage yields for different years, soils and management levels, however, were usually too low to have predictive value.

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