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Published in Crop Sci 9:713-716 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Influence of Seedling Characteristics on Weed Competitive Ability of Sorghum Hybrids and Inbred Lines1

E. Guneyli, O. C. Burnside and P. T. Nordquist2

Competitive ability of 48 sorghum [Sorghum bicolor (L.) Moench] hybrids and 41 parental inbred lines was evaluated using (a) germination percentage and germination rate index, (b) emergence percentage and emergence rate index, (c) seedling vigor, (d) rate of root and shoot development, and (e) cation exchange capacity of roots as selection criteria. Average response of sorghum hybrids was superior to parental inbred lines in all selection criteria. Sorghum lines selected for high and low seedling growth characteristics in laboratory and greenhouse studies showed corresponding competitive advantages over weeds in field studies. Competitive advantage of sorghum over weeds was largely due to rapid germination, emergence, and root and shoot growth during the early stages of sorghum development.

Key Words: Germination and emergence percentage • germination and emergence rate index • seedling vigor • cation exchange capacity of roots • competitive ability

1 Published with the approval of the Director as paper No. 2517, Journal Series, Nebraska Agr. Exp. Sta. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the M.S. degree at the Univ. of Nebraska, Dept. of Agronomy.

2 Former Graduate Assistant, Professor, and Instructor, Department of Agronomy, University of Nebraska, Lincoln 68503. Senior author is now Graduate Assistant, Dept. of Farm Crops. Oregon State Univ., Corvallis.

Received for publication January 13, 1969.


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A. R. Putnam and W. B. Duke
Biological Suppression of Weeds: Evidence for Allelopathy in Accessions of Cucumber
Science, July 26, 1974; 185(4148): 370 - 372.
[Abstract] [PDF]


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