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Fig. 7. Recovery of labeled fertilizer N from mineral and Kjeldahl N minus inorganic (KMI) N fractions of a 1.2-m soil profile following a 1995 application of 15NH415NO3. Lowercase and uppercase letters are for comparing (P < 0.05) KMI-N and mineral N means, respectively, within a sampling event. Least significant differences (P < 0.05) for comparing mineral N and KMI-N means within a N treatment and across sampling dates are 6 and 14 kg ha–1, respectively. Parenthetical values are standard deviations for their corresponding means.
