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Sampling Quackgrass (Elytrigia repens) Populations

Published online by Cambridge University Press:  12 June 2017

Claudel Lemieux ,
Daniel C. Cloutier  and
Gilles D. Leroux
Claudel Lemieux
Affiliation:
Res. Sci., Res. Stn., Agric. Canada, 2560 Hochelaga Blvd., Sainte-Foy, Qc, Canada G1V 2J3
Daniel C. Cloutier
Affiliation:
Res. Sci., Exp. Farm, Agric. Canada, P.O. Box 3398, L'Assomption, Qc, Canada J0K 1G0
Gilles D. Leroux
Affiliation:
Dep. Plant Sci., Laval Univ., Cite Universitaire, Qc, Canada G1K 7P4
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Abstract

This work was initiated to develop a method of sampling quackgrass populations. Shoot and bud distribution of 36 field populations was obtained. The results demonstrated that shoot count was inappropriate in assessing quackgrass bud populations and that bud sampling depth should be at least 20 cm if an accurate estimate is required. When shoot count is the only possibility, quadrat size should be as large as possible to minimize the error. Descriptive statistics of the field populations were used to generate a series of 24 simulated quackgrass bud populations. The field and simulated data were computer sampled with a program designed to compare the effects of varying sample size (number of quadrats) and sample shape (quadrat size and form). The intensity of sampling must be a function of resources and cost, since sampling precision increased linearly with sample size. Precision of sampling was generally higher when a large number of small quadrats were used compared to a small number of large quadrats. Sampling intensity per unit area must be increased when bud density increases to maintain a given degree of precision, but it can be decreased when plot size increases.

Keywords

Bromoxynil, 3,5-dibromo-4-hydroxybenzonitriledicamba, 3,6-dichloro-2-methoxybenzoic acidquackgrass, Elytrigia repens (L.) Nevski #3 AGRREAgropyron repensElymus repenssample sizequadrat sizequadrat formshootrhizome budsAGRRE
Type
Weed Biology and Ecology
Information
Weed Science , Volume 40 , Issue 4 , December 1992 , pp. 534 - 541
Copyright
Copyright © 1992 by the Weed Science Society of America 

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