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Fig. 2. Least-squares means (LSM) values for interaction effect of amendment type x rate x year on average loads of total phosphorus (TP) (a), amendment type x rate effect on dissolved reactive phosphorus (DRP) (b), amendment type x year effect on DRP (c) rate x year effect on DRP (d), amendment type x year effect on total nitrogen (TN) (e), and amendment type x year effect on NH4–N (f), in runoff from a clay loam soil in southern Alberta. The LSM comparisons are valid for horizontal bars. The LSM values followed by different lowercase letters are significantly (P 
0.05) different, whereas those followed by the same letter are not significantly different.
