Factors Affecting Nitrate Nitrogen and Chloride Leaching Variability in a Field Plot1
- D. R. Cameron,
- C. G. Kowalenko and
- 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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