Suggested "objectives" in relation to fertility considerations

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

Nitrogen cycling in Pinus taeda (Loblolly pine).

Nutrient cycling in oak.

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

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

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

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

View of white spruce plantations at Warrensburg; background fertilized with K at 200lb/ac. foreground untreated.

Dr. H. Lowenstein in 25 year old red pine of Heiberg's trial. This is the humus series control plot at Warrensburg.