Red pine plantation root deep in C horizon in old root channel cf. with root slides.

Hinckley Series sandy loam in outwash. Typical profile at Pack Forest, site of Heiberg's trials.

View of 30 year old red pine plantation in early June 1965.

General view of Pack Forest at Warrensburg, N.Y. site of the first nutrient trials of Heiberg

Nutrient cycling in oak.

Nitrogen cycling in Pinus taeda (Loblolly pine).

Graph showing relationship between growth and Nitrogen content in plantation trees over rotation; data of Switzer, Smith & Nelson.

Suggested "objectives" in relation to fertility considerations

Tabular data for the graphs shown in Slide # 269 of seedling size in relation to three fertility levels and four densities.

Growth of seedlings at three fertility levels and four seedbed densities to show interrelationships.