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© 1974 Oxford University Press

RESEARCH-ARTICLE

Effects of Film Antitranspirants on Growth

D. C. DAVENPORT, K. URIU and R. M. HAGAN

Department of Water Science and Engineering, University of California Davis, California 95616 U.S.A.

Film antitranspirants were shown to affect growth adversely by reducing photosynthesis, and favourably by increasing plant water potential. The net effect on growth was to: (1) reduce leaf expansion, plant height, and yield of snap beans in the field; (2) increase internode and leaf elongation of oleanders over a short period, with no effect on shoot length over a longer period; (3) reduce radial expansion of trunks of fruit trees; and (4) increase the size of orchard fruits. Whether an antitranspirant reduces or increases growth of a particular plant part probably depends on whether current photosynthesis or plant water potential is more important to its development at the time of treatment.


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