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Fig. 4. Box-and-whiskers plots of non-flow-weighted NO3–N concentration observed in percolate water below turfgrass plots in Connecticut from 15 May 2001 to 14 May 2003. Treatments are date of fall fertilization: control (no fall fertilizer), 15 September, 15 October, 15 November, or 15 December. Analysis of variance indicates differences in mean log10 concentration among treatments (p < 0.0001). Same letters indicate log10 mean concentration not significantly different according to Tukey's Honestly Significant Difference test with Kramer's adjustment (
= 0.05).
