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Nonlinear Regressions for Analyzing Growth Stage and Quinclorac Interactions

Published online by Cambridge University Press:  12 June 2017

William J. Chism ,
Jeffrey B. Birch  and
S. Wayne Bingham
William J. Chism
Affiliation:
Dep. Plant Path., Physiol. Weed Sci., Va. Polytech. Inst. State Univ., Blacksburg, VA 24061
Jeffrey B. Birch
Affiliation:
Dep. Stat., Va. Polytech. Inst. State Univ., Blacksburg, VA 24061
S. Wayne Bingham
Affiliation:
Dep. Plant Path., Physiol. Weed Sci., Va. Polytech. Inst. State Univ., Blacksburg, VA 24061
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Abstract

Control of southern crabgrass by quinclorac was influenced by plant growth stage. A three-parameter nonlinear regression was used to describe the influence of quinclorac concentration on each growth stage and to compare growth stages. A SAS® program for these comparisons is described. Pseudo R2 values for fit were above 0.98 for all tests. Flowering crabgrass plants had the highest GR50 value (50% growth reduction on a dry weight basis) whereas preemergence, three- to five-true-leaf, and two- to four-tiller stages were lower.

Keywords

Quinclorac, 3,7-dichloro-8-quinolinecarboxylic acidsouthern crabgrass, Digitaria ciliaris (Retz.) Koel. # DIGSPCrabgrass controlphysiological factorsherbicideBAS 514 HBAS 090 S
Type
Research
Information
Weed Technology , Volume 6 , Issue 4 , December 1992 , pp. 898 - 903
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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