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Over 7 growing seasons, yellow-poplar height was significantly greater when irrigated and/or fertilized at planting time with 50 gms MagAmp (7-45-0 w/5 Mg) plus 30 gms Ureaform N (45 percent N) per tree. Growth was significantly better on undisturbed Claiborne silt loam on an upper-slope position as compared to a lower-slope, old-field site on Fullerton cherty silt loam. Where both treatments were applied the growth increase appeared to be the additive effects of separate applications. Fertilization appeared to stimulate growth more on the old-field site while irrigation stimulated growth more on the upper slope. Sweetgum growth under the various treatment conditions followed a pattern similar to that for yellow-poplar but growth differences among treatments were smaller. Loblolly pine grew significantly better in fertilized plots during 2 seasons and in irrigated plots only on the upper slope during dry seasons. After 7 years there was no apparent fertilizer effect on loblolly pine and only a small growth increase in irrigated plots on the upper slope. Survival and growth for northern red oak was poor under all treatment conditions. After 7 years loblolly pine was the tallest (6.3 m) of the four species when averaged over all test variables while yellow-poplar growing on the undisturbed Claiborne soil with irrigation and fertilization was the tallest (7.6 m). FOREST SCI. 23: 402-410.
Carl Alvin Schenck Professor of Forest Management, N.C. State University, Raleigh, N.C.
Publication date: December 1, 1977
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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.