Dr. Al Leaf of SUNY, (Syracuse) describing his study on red pine roots, Pack Forest, Warrensburg

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.

Dragon fertilization tank on irrigation system. Fertilization.

Dragon fertilizer injection used in fertilizing seedbeds. Jack pine, 1+0, fertilization using irrigation system.

Drill seeder in action. Seeding.

Drill sowing seed using a modified agricultural drill sower. Black spruce, 1+0, sowing seed.

Drill sown beds of rising 2+0 douglas fir at Aurora nursery. Fir douglas, 2+0, seedbeds. Weyerhaueser.

A drill sown in late May; height-4-6cm. Fir douglas, 1+0, sowing date.

Drill sown in mid-April; height-6-9cm. Fir douglas, 1+0, sowing date.