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.

Dr. Howard Lowenstein in Heinberg's 25 year old red pine in which in 1935 Heiberg dug in 2 inches on humus into the soil before planting.

Red pine 30 years old at Warrensburg, left is untreated control; right was treated with K at 200lb/ac when stand was 15 years old.

Untreated red pine plantation, 35 years old, planted at 1.5x1.5m at Warrensburg.

Red pine plantation 35 years old treated with K at 200lb/ac. at age 20cf. with #283 and note much less light of forest floor due to denser foliage.