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Growth and Development of Johnsongrass Ecotypes

Published online by Cambridge University Press:  12 June 2017

C. G. McWhorter
C. G. McWhorter*
Affiliation:
Southern Weed Science Laboratory, Crops Research Division, Agr. Res. Serv., U.S. Dep. of Agr. in cooperation with the Delta Branch, Mississippi Exp. Sta., Stoneville, Mississippi
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Abstract

Studies were conducted on the growth and development of 55 morphologically distinct vegetative types of johnsongrass (Sorghum halepense (L.) Pers.) collected throughout the United States and from several foreign countries. Observations were made also on the growth of sorghum almum (Sorghum almum Parodi) from three foreign countries. Mature leaf-blades of the different johnsongrass ecotypes varied in length from 31 to 59 cm and in width from 1.7 to 3.4 cm. Plant height and culm density varied 2 to 4-fold for the different ecotypes. Floret production varied from 87 to 352 sessile spikelets for representative panicles of the different ecotypes. The number and arrangement of branchlets within panicles also varied as did the size of various spikelet components. Sorghum almum produced much taller plants than did johnsongrass although culm density and lateral growth were less than that of johnsongrass.

Type
Research Article
Information
Weed Science , Volume 19 , Issue 2 , March 1971 , pp. 141 - 147
Copyright
Copyright © Weed Science Society of America 

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