Fig. 4. Effects of compost topdressings on percent foliar N. Error bars represent standard error (n = 18). Dashed vertical lines represent dates of compost topdressing applications. Means are averaged across treatments of inorganic fertilizer. Significant inorganic fertilizer x compost topdressing interactions were observed only on 25% of the rating dates over the 3-yr study, and all of these occurred within 50 d after the May topdressing applications

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