Response over two growing seasons of a Sitka spruce stand to 15N-urea fertilizer |
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Authors: | Sharon C Hulm Kenneth Killham |
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Institution: | (1) ICI Agrochemicals Division, Jealotts Hill Research Station, RG12 6EY Bracknell, Berkshire, U K;(2) Department of Plant and Soil Science, The University of Aberdeen, Meston Walk, AB9 2UE Aberdeen, UK |
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Abstract: | Urea fertilizer labelled with 15N (2.5 atom %) was applied to a 20 year old Sitka spruce stand on a peaty gley at a rate equivalent to 160 kg N ha−1. The application of urea resulted in increased biomass and N concentration of needles and enhanced development of the crown.
Differences in N concentrations of the amended trees were also observed for new wood and bark. Analysis of 15N in tree biomass showed a continued influence of fertilizer N in the second growing season following urea application. The
overall recovery of fertilizer N in the trees was estimated to be about 10%. |
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Keywords: | 15N urea fertilizer Sitka spruce |
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