Considerable debates exist about the efficacy of foliar application of nutrients to Christmas trees, but little research has been conducted to determine whether this method of fertilization is beneficial. In this study, standard foliar and soil-applied fertilization products were applied
to Nordmann fir Christmas trees under greenhouse and field-grown management regimes. On both sites, foliar nitrogen (N) and boron (B) concentrations, color, and normalized difference vegetation index (NDVI) were evaluated. Plant growth and needle chlorophyll/carotenoids were also monitored
at the greenhouse site and sulfur (S) at the field site. At all sites, the soil-applied fertilizers were effective in increasing foliar N% compared to untreated and foliar applications. The foliar-applied products did not improve foliar N% compared to untreated trees. Foliar B concentrations
were correlated with foliar fertilizer applications, indicating that B can be absorbed via foliar application. A second part of this study investigated alternate or complementary methods of assessing foliar N%. We addressed whether plant color, spectral reflectance, chlorophyll measures, or
NDVI measurements could serve as surrogates for foliar N%. Color, chlorophyll/carotenoid, and foliar N% were closely correlated. However, NDVI evaluations showed no relationship with foliar N%, color, or chlorophyll/carotenoid levels.
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Abies nordmanniana (Stev.) Spach;
Document Type: Research Article
Forest Engineering, Resources and Management, Oregon State University, North Willamette Research and Extension Center, Aurora, OR, USA
Horticulture, Virginia Polytechnic Institute and State University, Agricultural Research and Extension Center, Virginia Beach, VA, USA
Horticulture, Oregon State University, Corvallis, OR, USA
Publication date: 2013-07-01
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