Phenology of Common Lambsquarters
Growth Parameters
J. Colquhoun, D. E.
Stoltenberg, L.K. Binning,
and C.M. Boerboom
Research was conducted to
characterize the phenology of common lambsquarters growth parameters as
influenced by climatic variation among years. Treatments included soybean or
corn grown alone, common lambsquarters with soybean or corn, and common
lambsquarters grown alone. Common lambsquarters leaf area and plant height
phenology differed among years and was variable within treatments. Conversely,
crop leaf area and plant height phenology did not differ among years and was
less variable within a treatment than common lambsquarters. Weed relative leaf
area and relative volume differed among years because of differences in crop and
common lambsquarters leaf area and plant height phenology. Differences in common
lambsquarters relative leaf area and relative volume among years may explain
differences in previously reported crop yield responses to weed infestations
between sites and years. Although common lambsquarters relative leaf area and
relative volume differed among years, variability as indicated by regression
coefficients of determination was also high within year and treatment. Crop
leaf area and plant height phenology were well described by regression
equations, with r2 values greater than
0.68. Therefore, low coefficients of determination for relative leaf area and
relative volume models were attributed to variability in common lambsquarters
within a treatment.
Weed Science. 49:177-183 (2001) |
