130-1 Uptake Efficiency and Transport of Applied Nitrogen Fertilizers within Douglas-Fir Forests of the Pacific Northwest.
See more from this Division: SSSA Division: Forest, Range & Wildland SoilsSee more from this Session: Forest, Range & Wildland Soils: I
Monday, November 3, 2014: 1:35 PM
Long Beach Convention Center, Seaside Ballroom B
Nitrogen (N) is known to be a limiting nutrient in Pacific Northwest forests, particularly in Douglas-fir ecosystems. Theoretically, N fertilization should ameliorate these deficiencies and increase tree growth. However, previous studies have shown that of the total N applied, the surrounding trees absorb only between 12-43%. This study is composed of 10 sites along the western Douglas-fir region of Oregon and Washington. These sites were selected to include the range of parent materials and latitudes of plantation forests in the region. A complete randomized block design was used where each installation is a replicate that includes five treatment plots. The plots were treated with 15N-enriched Urea, Agrium ESN, Urea + NBPT, or Urea + CUF type fertilizers. The remaining plot was an unfertilized control. The fertilizers were enriched to 0.5AP 15N (~370 0/00 15N). Using a fertilizer enriched with 15N, the nitrogen is traced as it moves between pools within the study area.
See more from this Division: SSSA Division: Forest, Range & Wildland SoilsSee more from this Session: Forest, Range & Wildland Soils: I