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Tentative Technique for Determining the Influence of Soil on the Growth of Forest Plantations¹

ABSTRACT

This paper reports analytical techniques for the determination of the influence of soil on the growth of red pine and white spruce plantations. The ecological homogeneity of the plantation or portion thereof is checked by a transect survey of tree heights and diameters and soil analysis. The estimate of the rate of growth is made on the basis of stem analyses of the average sample trees. The field and laboratory investigation of soil properties is supplemented by foliar analysis and, in the case of hydromorphic soils, by the determination of properties of ground water. The importance of an accurate estimate of the density of nurse stands is stressed. The applicability of suggested methods is illustrated by concrete examples.

¹ Contribution of the Soils Department of the University of Wisconsin in cooperation with the Wisconsin State Conservation Department. Publication approved by the Director, Wisconsin Agr. Exp. Sta. Presented before Div. V-A, Soil Science Society of America, St. Paul, Minn., Nov. 10, 1954.

² Fulbright Scholar, Helsinki, Finland, and visiting scholar, Zurich, Switzerland. The authors express their appreciation for helpful suggestions rendered by Dr. Peitsa Mikola and Dr. S. P. Gessel.

Received for publication October 26, 1955.