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Estimating seed production of three Setaria species in row crops

Published online by Cambridge University Press:  20 January 2017

Frank Forcella ,
Nathalie Colbach  and
George O. Kegode
Nathalie Colbach
Affiliation:
Station d'Agronomie, INRA, BV 1540, 17 rue Sully, 21034 Dijon Cedex, France
George O. Kegode
Affiliation:
Department of Agronomy and Plant Genetics and West Central Research and Outreach Center, University of Minnesota, Morris, MN 56267
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Abstract

Seed production of weedy species of Setaria in crops of Zea mays and Glycine max was studied for 2 yr in western Minnesota and eastern South Dakota. Viable seed production was curvilinearly related to panicle length. A 100-mm-long panicle of S. pumila, S. faberi, and S. viridis produced 129, 323, and 851 viable seeds, respectively. Values were consistent across years, crops, and herbicide treatments. Frequency distributions of panicle lengths of all panicles within a population closely followed nonlinear Weibull functions and were stable across years and crops but not species or herbicide treatment. Positive skewness of these distributions decreased, and median panicle size (mm) increased, in the following order: S. viridis (41), S. pumila (52), and S. faberi (78). Postemergence herbicides applied at full label rates increased skewness and reduced median panicle size (to 11 mm) and seed production of S. viridis. Skewness lessens the reliability of using average panicle size as a measure of seed production for the entire population. However, integration of panicle size–frequency and panicle size–fecundity relationships provided estimates of the number of seeds per panicle that were more representative of the population than the statistical average panicle. These estimates were 52, 242, and 246 seeds per panicle for S. pumila, S. viridis, and S. faberi, respectively. Multiplication of these values by panicle densities generated seed production estimates that were similar to actual counts of seeds. Setaria seed production tended to be higher in Z. mays than in G. max only because of higher plant and panicle densities. Early-maturing panicles tended to be larger than those maturing later, but seed viability generally was stable across maturity times.

Keywords

Soybean, Glycine max (L.) Merr.giant foxtail, Setaria faberi (L.) Beauv. SETFAyellow foxtail, S. pumila (Poir.) Roem. & Schult. (= S. glauca (L.) Beauv.), SETLUgreen foxtail, S. viridis (L.) Beauv. SETVIcorn, Zea mays L.Seed dispersalseed rain
Type
Research Article
Information
Weed Science , Volume 48 , Issue 4 , August 2000 , pp. 436 - 444
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Present address: Department of Plant Sciences, North Dakota State University, Fargo, ND 58101

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