Row Spacing Influences the Critical Timing for Weed Removal in Soybean (Glycine max)1

By Stevan Knezevic, S. Evans, M. Mainz. Weed technology, 2003

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Weed–crop competition relationships differ between organic and conventional cropping systems (2009, background): “…19 to 76 cm, the critical period in the crop growth cycle when weed control must be initiated to protect potential yield loss was determined to be latest in 19 cm rows and earliest in 76 cm rows, illustrating a decrease in soyabean competitive ability at wider row spacing (Knezevic et al., 2003).”
Utilizing R Software Package for Dose-Response Studies: The Concept and Data Analysis (2007, methodology): “…a variety of statistical programs have become available, and many have been utilized to fit nonlinear regressions and estimate their parameter values, including SAS 1 (Knezevic et al. 2002), Sigma Plot, S-PLUS H 2 , Axum H 3 (Evans et al. 2003), and FIG-P H 4 (Knezevic et al. 2003a, 2003b).”
Weed management using crop competition in the United States: A review (2017, background): “indicating enhanced weed competitive ability of the narrow-row soybean (Knezevic et al., 2003).”
Soybean row spacing and weed emergence time influence weed competitiveness and competitive indices (2006, background): “However, in most cases producers are faced with a multi-species complex of weeds, different relative emergence times, variable weed densities, and site-specific environmental conditions (Evans et al. 2003; Knezevic et al. 1997, 2002, 2003).”