Abstract
Concentrations of N, P, Ca, and Mg but not K in loblolly pine (Pinustaeda L.) needle fall were significantly correlated with their respective levels in both young and older living foliage; correlations were generally highest with levels in the older foliage. Tissue P concentrations were significantly correlated with 5-year response to P fertilization, while tissue N concentrations were poor predictors of response to N fertilization. No single tissue type exhibited any superiority at predicting fertilizer response. Needle fall was easier to collect than living foliage but showed greater within-site variation.
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