Relative effectiveness of nutrient concentrations in living foliage and needle fall at predicting response of loblolly pine pinus taeda to nitrogen and phosphorus fertilization

Lea, R.; Ballard, R.

Canadian Journal of Forest Research 12(3): 713-717


ISSN/ISBN: 0045-5067
Accession: 006303937

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Concentrations of N, P, Ca and Mg but not K in loblolly pine (P. taeda 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-yr 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.