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Factors Affecting Linolenic and Linoleic Acid Content of Soybean Oil¹

Synopsis: Linolenic acid content of soybean oil from location and variety composites varied from about 5% to about 8.5% and linoleic acid varied from about 46% to about 54%. The levels of both fatty acids were closely, but inversely correlated with temperature. Changes in environmental factors such as photoperiod, light intensity and quality, N, P, K, and S nutrition, or the addition of manure or plant residues had little or no effect on the levels of these fatty acids.

² Plant Physiologist and Chemist, respectively, Crops Research Division, A.R.S., U.S.D.A. The authors gratefully acknowledge the courtesy of Drs. H. A. Borthwick, H. W. Johnson, R. C. Leffel, and G. A. Marlowe, and of Drs. P. H. Van Schaik and A. H. Probst in making available their material produced at Plant Industry Station, Beltsville. Maryland, and Purdue University, Lafayette, Indiana, respectively.

Received for publication April 11, 1957.

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