Diagnosis and Recommendation Integrated System (DRIS) Nutrient Norms for Fraser Fir Christmas Trees
Authors: Rathfon, R. A.; Burger, J. A.
Source: Forest Science, Volume 37, Number 4, 1 September 1991 , pp. 998-1010(13)
Publisher: Society of American Foresters
Abstract:Fraser fir (Abies fraseri [Pursh] Poir.) is an important Christmas tree species in Virginia and North Carolina. Because it is responsive to fertilization, and because most Fraser fir growers fertilize their crop, a scientifically based nutrient diagnosis and fertilizer recommendation system is needed. The objective of this study was to develop and test Diagnosis and Recommendation Integrated System (DRIS) norms for Fraser fir Christmas trees for the ultimate purpose of establishing a nutrition diagnosis and fertilizer prescription system. A total of 107 Fraser fir plantations were sampled for foliage, soil, and diameter measurements. These plantations represented the range in site conditions and management practices for Fraser fir Christmas trees grown in Virginia. Foliage and soil were analyzed for macro- and micronutrients. DRIS norms were developed from these data using standard DRIS procedures. A total of 42 nutrient ratios were significant discriminators of tree performance as measured by variation in groundline diameter. The norms were tested using sixth-year data from a factorial fertilizer trial. Nutrient limitations due to both deficiencies and imbalance were detected and correctly diagnosed using the newly derived norms. A more thorough validation will be made with time, but this preliminary test showed that these norms are a reasonable first approximation. For. Sci. 37(4):998-1010.
Document Type: Journal Article
Affiliations: Associate Professor, Department of Forestry, 228 Cheatham Hall, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0324
Publication date: September 1, 1991
- Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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