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Fig. 4. Soil nitrate content (7.5-cm depth) under alfalfa (Medicago sativa L.), timothy (Phleum pratense L.), and soybean (Glycine max L.) at the Chapais and Harlaka sites. Arrows indicate alfalfa, timothy, and soybean harvests. Bars represent the LSD (P = 0.05) values for the comparison of crop types at each sampling date; LSD values are only presented when the analysis of variance indicated a significant (P < 0.05) effect of the crop types.