Soil Nitrate-nitrogen Determined by Coring and Solution Extraction Techniques
1977
Alberts, E. E. | Burwell, R. E. | Schuman, G. E.
Soil-coring and solution-extraction sampling techniques were compared for determining the content of NO₃-N in the soil profile of a Monona silt loam (Typic Hapludoll) in southwestern Iowa. The NO₃-N content of the 3.05-m profile, determined by solution extraction, was 28% lower in 1972, 8% higher in 1973, and 13% lower in 1974 than that determined by soil coring. The profile difference in NO₃-N content between the two sampling techniques was insignificant in 1973 and 1974 but was highly significant (1%) in 1972.
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