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

ABSTRACT

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.

¹ Contribution from Agriculture Canada, Research Branch, Research Station, Swift Current, Saskatchewan.

² Research Scientists from Swift Current, Sask.; Agassiz, B.C.; and Swift Current, Saskatchewan, respectively.

Received for publication August 23, 1978. Accepted for publication February 22, 1979.

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