Dennis Robert Hoagland

Dennis Robert Hoagland (April 2, 1884 – September 5, 1949) was a plant scientist working in the field of plant nutrition. He was Professor of Plant Nutrition at the University of California at Berkeley from 1927 until his death in 1949., and was a member of the National Academy of Sciences. He was known especially for his work on hydroponics and the Hoagland solution.

Hoagland graduated from Stanford University (1907) with a major in chemistry. In 1908 he became an instructor and assistant in the Laboratory of Animal Nutrition at the University of California at Berkeley, an institution with which he would be associated for the remainder of his life. He worked in the field of animal nutrition and biochemistry until 1912, when he entered the graduate school in the department of agricultural chemistry at the University of Wisconsin, receiving his master's degree in 1913. The following year he became assistant professor of agricultural chemistry at Berkeley.

A Hoagland hydroponic solution provides every nutrient necessary for plant growth being appropriate for the growth of a large variety of plant species. The solution described by Hoagland and Arnon in 1938 has been modified several times, notably with the addition of iron chelates.

Studies of the Endogenous Metabolism of the Pig as Modified by Various Factors, etc. With E. V. McCollum. J. Biol. Chem., 16(2) :299-325.

The Destructive Distillation of Pacific Coast Kelps. J. Ind. Eng. Chem., 7(8) :673-676.

Organic Constituents of Pacific Coast Kelps. J. Agr. Res., 4(1) :39~58. The Complex Carbohydrates and Forms of Sulphur in Marine Algae of the Pacific Coast. With L. L. Lieb. J. Biol. Chem., 23(1) :287-297.

Acidity and Adsorption in Soils as Measured by Hydrogen Electrode. With L. T. Sharp. J. Agr. Res., 7:3.

The Effect of Hydrogen and Hydroxyl Ion Concentration on the Growth of Barley Seedlings. Soil Sci., 3(6) 547-560.

Relation of Carbon Dioxide to Soil Reaction as Measured by the Hydrogen Electrode. With L. T. Sharp. J. Agr. Res., 12(3) 1139-148.

The Freezing-Point Method as an Index of Variations in the Soil Solution Due to Season and Crop Growth. J. Agr. Res., 12(6) :369~395.

The Chemical Effects of CaO and CaCOs on the Soil. Part I. The Effect on Soil Reaction. With A. W. Christie. Soil Sci., 5(5) :379~392.

The Relation of the Plant to the Reaction of the Nutrient Solution. Science, 48(1243) :422-425.

Notes on Recent Work Concerning Acid Soils. With L. T. Sharp. Soil Sci. 7(3) =197-200.

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