Repeated grading of weed abundance and multivariate methods to improve the efficacy of on-farm weed control trials
2007 (English)In: Weed Biology and Management, ISSN 1444-6162, Vol. 7, no 2, 132-139 p.Article in journal (Refereed) Published
We evaluated whether new information could be drawn from additional data collection and unconventional statistical analyses of an on-farm trial. First, we compared a conventional sampling method using a biomass estimate of weed abundance to repeated visual assessment of the percentage ground cover of weeds. The biomass was sampled once after the treatment, whereas the ground cover was repeatedly sampled once before weed control plus several occasions after weed control. Second, we contrasted the outcomes from analysis of variance (ANOVA), taking samples from a single point in time with repeated measures (rm)ANOVA and a multivariate method. As the outcomes and conclusions drawn were relatively similar, we conclude that the ground cover estimate of weed abundance was as reliable as the biomass estimate. The rmANOVA enabled us to follow the temporal trend in response to treatments in the most abundant species, including possible initial differences. Multivariate analysis went even further, by clearly displaying species-wise responses and treatment selectivity.
Place, publisher, year, edition, pages
Blackwell Publishing , 2007. Vol. 7, no 2, 132-139 p.
ground cover, multivariate methods, repeated measures analysis of variance, weed control
IdentifiersURN: urn:nbn:se:liu:diva-11891DOI: 10.1111/j.1445-6664.2007.00247.xOAI: oai:DiVA.org:liu-11891DiVA: diva2:18290
The definitive version is available at www.blackwell-synergy.com: LIBÈRE NKURUNZIZA and PER MILBERG, Repeated grading of weed abundance and multivariate methods to improve the efficacy of on-farm weed control trials, 2007, Weed Biology and Management, (7), 132-139. http://dx.doi.org/10.1111/j.1445-6664.2007.00247.x. Copyright: Blackwell Publishing www.blackwell-synergy.com2008-05-232008-05-232014-10-08