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Variation in Potassium Available to Trees Within an Outwash Soil¹

ABSTRACT

Thirteen deep soil pits were sampled by strata, 40 forest floor samples were collected, and tube samples were taken at 119 locations of the surface 15-cm layer and at 30-cm intervals to a soil depth of 2.1 m. The sampling was done on an 0.8-ha area supporting good and poor growing 37-year-old red pine (Pinus resinosa Ait.) separated by an old fenceline. The soil has formed in slanted and discontinuous strata of different physical and chemical properties. Acid-extractable K data from the 13 pits indicate the magnitude but not the pattern of variability. Data from the pit samples were used to predict acid-extractable K for the tube samples. Regression techniques were used on the 0- to 15- and 15- to 45-cm layers. An ocular textural classification technique was employed for deeper soil layers. Results indicate K variability is pronounced in the soil volume studied and is associated with the occurrence of discontinuous finer-textured strata at differing depths. K variability as measured by these techniques was found to be only partly related to red pine growth.

¹ Contribution from the Department of Silviculture, State University College of Forestry at Syracuse University, Syracuse, N.Y. 13210. Financial assistance from National Science Foundation, GB-1279, GB-2396, and GB-6178 is gratefully acknowledged. Presented before Div. S-7, Soil Science Society of America, Aug. 23, 1966, at Stillwater, Okla.

² Research Assistant in Soils, North Carolina State University, Raleigh; Professor of Silviculture, State University College of Forestry at Syracuse University; and Research Assistant in Silviculture, State University College of Forestry at Syracuse University. Sincere appreciation is expressed to Professor S. W. Potter, Jr., Director of Pack Forest, and Dr. E. H. White for assistance in this work.

Received for publication April 9, 1968. Accepted for publication May 12, 1969.