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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.

Seedling growth plotted against Nitrogen concentration to show a linear relationship.

Changes in nutrient concentration with plant size to show the Steenjberg effect.

Changes in nutrient concentration (N & K) in relation to seedling size.