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Chemical Defoliation of Cotton VII. Effectiveness of Adjuvants Under Several Specific Plant and Environmental Conditions¹

Synopsis: The use of adjuvants with chemical defoliants increased the amount of leaf fall and rapidity of defoliation under limiting conditions such as wilted, toughened and inactive leaves, immature leaves and bolls, low temperatures, and conditions due to excessive applications of nitrogen. Under conditions considered favorable for defoliation, the use of adjuvants with chemical defoliants hastened leaf fall but no significant increase in total leaf fall was evident. The use of adjuvants with chemical defoliants did not retard defoliation.

² Plant physiologist, Crops Research Division, A.R.S., U.S.D.A., in cooperation with the Department of Agronomy, University of Arizona, Tucson.

Received for publication July 17, 1957.