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Eight Year Response to N and N+S Fertilization for the Umatilla Mixed Conifer Study in Northeast Oregon and Southeast Washington Item Info

Eight study sites were established in 1991 on the Umatilla National Forest to study forest growth response to nitrogen and nitrogen-sulfur fertilization. The eight sites corresponded to four locations, Pomeroy, Pendleton, Ukiah and Heppner, which were arrayed in a linear fashion from northeast to southwest across the Forest. While this location effect was confounded with many other factors, it was an important blocking factor for analyses of fertilization growth response. However, it was difficult to identify which location factors influenced fertilization response. The more mature stands at Pomeroy and Pendleton were analyzed together, while the Ukiah and Heppner sites were analyzed separately. Overall, while both N and N+S showed positive growth responses, N+S provided the greatest eight-year volume response. This response was greatest for the mature stands at the Pomeroy and Pendleton study sites. A positive N+S response did occur at Heppner, but was only detectable in analysis of relative volume response. Ukiah did not show a significant fertilization response. Both Heppner and Ukiah were difficult to analyze and understand due to problems inherent in their small tree sizes and open-grown conditions, as well as to wide variation in initial conditions. Two-year periodic volume growth was also calculated and displayed for each of the four locations. Periodic fertilizer responses were strongest during the first two to six years of the study, and fertilizer effect has diminished to the point of being almost indiscernible during the most recent two-year period.

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Title:
Eight Year Response to N and N+S Fertilization for the Umatilla Mixed Conifer Study in Northeast Oregon and Southeast Washington
Creator:
Garrison, M.T.; Moore, J.A.
Date Created (ISO Standard):
2000-04-01
Description:
Eight study sites were established in 1991 on the Umatilla National Forest to study forest growth response to nitrogen and nitrogen-sulfur fertilization. The eight sites corresponded to four locations, Pomeroy, Pendleton, Ukiah and Heppner, which were arrayed in a linear fashion from northeast to southwest across the Forest. While this location effect was confounded with many other factors, it was an important blocking factor for analyses of fertilization growth response. However, it was difficult to identify which location factors influenced fertilization response. The more mature stands at Pomeroy and Pendleton were analyzed together, while the Ukiah and Heppner sites were analyzed separately. Overall, while both N and N+S showed positive growth responses, N+S provided the greatest eight-year volume response. This response was greatest for the mature stands at the Pomeroy and Pendleton study sites. A positive N+S response did occur at Heppner, but was only detectable in analysis of relative volume response. Ukiah did not show a significant fertilization response. Both Heppner and Ukiah were difficult to analyze and understand due to problems inherent in their small tree sizes and open-grown conditions, as well as to wide variation in initial conditions. Two-year periodic volume growth was also calculated and displayed for each of the four locations. Periodic fertilizer responses were strongest during the first two to six years of the study, and fertilizer effect has diminished to the point of being almost indiscernible during the most recent two-year period.
Subjects:
research (document genres) fertilizer timber (lumber) statistics
Location:
North and Central Idaho; Eastern Washington; Western Montana; Northeastern Oregon
Publisher:
Intermountain Forest Tree Nutrition Cooperative, University of Idaho, College of Forest, Wildlife and Range Sciences, Moscow
Source:
Garrison, M.T., J.A. Moore. 2000. Eight Year Response to N and N+S Fertilization for the Umatilla Mixed Conifer Study in Northeast Oregon and Southeast Washington. IFTNC, College of Natural Resources, University of Idaho, Moscow.
Source Identifier:
Eight_Year_Response_to_N_and_N+S_Fertilization_Umatilla_Mixed_Conifer_Study_in_NE_Oregon_SE_Washington_IFTNC_2000
Type:
Text
Format:
application/pdf

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Source
Preferred Citation:
"Eight Year Response to N and N+S Fertilization for the Umatilla Mixed Conifer Study in Northeast Oregon and Southeast Washington", Idaho Forestry Research Collection, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/forestryresearch/items/forestryresearch936.html
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Educational use includes non-commercial use of text and images in materials for teaching and research purposes. Digital reproduction rights granted by University of Idaho Library. For other uses beyond educational use, please contact University of Idaho Library Special Collections and Archives Department at libspec@uidaho.edu.
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