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Annual Variation in Foliage of Fertilized and/or Irrigated Red Pine Plantations¹

ABSTRACT

Near-terminal, current-year autumnal foliage from 160 trees in 2 by 2 m spaced, 40-year-old red pine plantations (Pinus resinosa Ait.) growing on sandy outwash soil was sampled for 6 consecutive years and analyzed for length and dry weight, and concentrations and contents of ash, N, P, K, Ca, and Mg. The sample trees are from the dominant canopy on a 0.8-ha area of known K deficiency, subdivided into four paired treatment plots of 40 sample trees per treatment: control, irrigation, fertilization, and combination treatments. The paper describes spatial and temporal variation and treatment response in foliage characteristics. The results indicate that the bases of expression of nutrient elements and climatic conditions affect the nutrient status diagnosis for long-term management considerations.

¹ Contribution of the Department of Silviculture, State University College of Forestry at Syracuse University; and the Cooperative Watershed Research Unit, Northeastern Forest Exp. Sta., Forest Service USDA, Syracuse, N. Y., 13210. Financial assistance from the National Science Foundation and U. S. Forest Service is gratefully acknowledged. Presented before Div. S-7, Soil Science Society of America, Nov. 11, 1969, at Detroit, Mich.

² Professor of Silviculture and Assistant Professor, College of Forestry; and Project Leader, Northeastern Forest Exp. Sta. The assistance of Dr. J. B. Hart, Jr., Messers, R. A. Cunningham, J. M. Gillen, L. R. Johnston, and N. I. Lamson, and Mrs. M. G. Osborne is gratefully acknowledged. Sincere appreciation is expressed to Professor S. W. Potter, Jr., Director of Pack Forest.

Received for publication January 5, 1970. Accepted for publication March 12, 1970.