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Fig. 1. Least-squares means (LSM) values for interaction effect of amendment type x year on concentrations of total phosphorus (TP) (a), particulate phosphorus (PP) (b), dissolved reactive phosphorus (DRP) (c), and NH4–N (d) in runoff from a clay loam soil in southern Alberta. The LSM comparisons are valid for horizontal bars (within year). The LSM values followed by different lowercase letters are significantly (P 
0.05) different, whereas those with no lowercase letter are not significantly different.
