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This article in AJ

  1. Vol. 58 No. 1, p. 85-88
    Received: June 25, 1965

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Changes in Content of Total Nitrogen and Organic Matter in Three Nebraska Soils After Seven Years of Cropping Treatments1

  1. Andrew P. Mazurak and
  2. Elverne C. Conard2



Grasses compared with one another differed in their effect on the change in total N content of Brunizem soil at O- to 6-inch and 6- to 12-inch depths. However, the mean N content of soil cropped to grasses was not different from the mean for small grains. Plots that received ammonium nitrate fertilizer were significantly higher in total N content of soil in the O- to 6-inch depth than were the nonfertilized plots.

Grasses growing on Chernozem soil reduced the total N content in die O- to 6-inch depth of the soil. The application of N fertilizer minimized the losses or increased the total N content of soil.

Application of N fertilizer increased significantly the total N content of the O- to 6-inch depth of Chestnut soil.

Cropping to grain on Chestnut and Chernozem soils necessitates the use of N fertilizer to maintain N content level in the soil. The effect of N fertilizer on the total N content of soil was evident in the O- to 6-inch depth but not in the 6- to 12-inch depth.

Total oxidizable organic matter content showed the same results as the total N content in soil. Carbon/ nitrogen ratio of the soil was slightly increased during the 7 years of cropping to cool-season grasses. Warm-season grasses decreased C/N ratio in Brunizem soil.

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