. Auxins and plant growth. Auxin; Plant growth promoting substances. 12 Fundamentals of Auxin Action et al (1945), Blackman (1945), Nutman et al (1945) and Kraus and Mitchell (1947). The herbicidal uses of growth regulators are by far the most widespread. It is estimated that 60,000,000 pounds of 2,4-D are manufactured annually in the United States and perhaps 50,000,- 000 acres of land are treated with this herbicide alone. The dramatic rise in the production of 2,4-D since its first release from secrecy in 1945 can be seen in figure YEAR Fig. 2. The rise in the annual manufacture of 2,4-
. Auxins and plant growth. Auxin; Plant growth promoting substances. 12 Fundamentals of Auxin Action et al (1945), Blackman (1945), Nutman et al (1945) and Kraus and Mitchell (1947). The herbicidal uses of growth regulators are by far the most widespread. It is estimated that 60,000,000 pounds of 2,4-D are manufactured annually in the United States and perhaps 50,000,- 000 acres of land are treated with this herbicide alone. The dramatic rise in the production of 2,4-D since its first release from secrecy in 1945 can be seen in figure YEAR Fig. 2. The rise in the annual manufacture of 2,4-D in the United States since the open publication of its herbicidal effects in 1945. Data of U. S. Tariff Commission. The development of an understanding of auxins in plant growth has effected startling advances in physiological and technological knowledge. Although the understanding of theoretical physiology has in many respects been outstripped by the technology of the applica- tion of auxins, still that is where the foundations of the entire field were laid, and the only sound basis for efficient progress lies in the advances of fundamental physiological Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Leopold, A. Carl (Aldo Carl), 1919-. Berkeley, University of California Press
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