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Published online 1 May 1971
Published in Agron J 63:480-483 (1971)
© 1971 American Society of Agronomy
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Effect of Two Growth-Regulating Chemicals on Yield and Water Use of Three Perennial Grasses1

E. L. Mathias, O. L. Bennett, G. A. Jung and P. E. Lundberg2

Growth responses of smooth bromegrass (Bromus inermis Leyss), Kentucky-31 tall fescue (Festuca elatior L.), and common Kentucky bluegrass (Poa pratensis L.) to the growth-regulating chemicals F-529 (N-pyrrolidinosuccinamic acid) and Cycocel (2-chloroethyltrimethylammonium chloride) were studied. Growth of grasses was reduced to near zero when Cycocel was applied at a concentration of 0.584M, with at least some retardation occurring up to 100 days after application.

F-529 was less effective than Cycocel in retarding grass growth. Maximum reduction occurred at the 0.45M concentration where growth was reduced to 35% of the control, and at 70 days following application there was no reduction. Recovery from both chemicals was generally followed by a period of stimulated growth.

Water use, in general, was highly correlated with amount of top growth.

Food reserves of plants as determined by eiolated growth were significantly reduced only at the 0.292M and 0.584M concentrations of Cycocel, where severe foliar damage had occurred.

Key Words: Water use • Growth-regulating chemicals • Cycocel • F-529 • Etiolated growth • Growth retardant

1 Cooperative studies between the Northeast Branch, Soil and Water Conservation Research Division, Agricultural Research Service, USDA, and West Virginia University Agricultural Experiment Station, Morgantown, W. Va. 26506. Work conducted as partial fulfillment by the senior author of the requirements for the M.S. degree.

2 Agronomist, SWC, ARS, USDA; Research Soil Scientist, SWC, ARS, USDA; Research Agronomist, U. S. Regional Pasture Research Laboratory, University Park, Pa. (formerly Professor of Agranomy, West Virginia University); and Agronomist, SWC, ARS, USDA, Morgantown, W. Va., respectively.

Received for publication October 23, 1970.




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Copyright © 1971 by the American Society of Agronomy.