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Soil Science Society of America Journal Abstract -

Factors Affecting Nitrate Nitrogen and Chloride Leaching Variability in a Field Plot1


This article in SSSAJ

  1. Vol. 43 No. 3, p. 455-460
    Received: Aug 23, 1978
    Accepted: Feb 22, 1979

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  1. D. R. Cameron,
  2. C. G. Kowalenko and
  3. C. A. Campbell2



Nitrate nitrogen and chloride concentrations were monitored in a 3-year field study in order to examine factors affecting their variability. Fertilized and control plots, established each year, were sampled at least eight times throughout the year by removing about six-replicate soil cores for individual analyses each sampling time. It was found that non-uniform fertilization application accounted for 38 to 100% of the sampling variability immediately after fertilization. In fall and spring, differential rates of leaching of NO3-N and Cl appeared to contribute significantly to variability increasing C.V.'s from about 40% to over 100%. Field and model results showed that differential leaching patterns could be attributed to two main factors: (i) variability of physical properties that determine water storage and transport, and (ii) point differences in redistribution of incoming rain (runoff) due to differences in surface microrelief.

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