Estimating economic thresholds for site-specific weed control using manual weed counts and sensor technology: an...

Area of Science:

• Agricultural Science
• Agronomy
• Crop Science

Background:

• Precision experimental design integrates sensor technology and linear mixed models to analyze field heterogeneity.
• It estimates the impact of weeds, soil properties, and herbicides on crop yield, enabling economic threshold determination.
• Three field trials in winter wheat utilized this design, incorporating manual sampling, bi-spectral cameras, yield mapping, and soil property analysis.

Purpose of the Study:

• To present a novel approach for conducting agricultural field trials.
• To derive practical decision rules for weed control in farmers' fields.
• To assess the efficacy of precision experimental design in winter wheat cultivation.

Main Methods:

• Utilized precision experimental design in winter wheat field trials.
• Employed manual sampling and bi-spectral cameras for weed density assessment.
• Mapped yield and soil properties, applying linear mixed models to analyze data.

Main Results:

• Identified yield reductions caused by specific weeds (Galium aparine, broad-leaved weeds, Alopecurus myosuroides) and established control thresholds.
• Observed that spring drought mitigated weed effects on yield due to water limitation.
• Bi-spectral cameras showed potential for identifying large weed patches but require further refinement for accurate weed counting.

Conclusions:

• Introduced a new methodology for field trials and deriving weed control decision rules.
• Demonstrated the utility of precision experimental design for site-specific weed management in agriculture.
• Highlighted the need for continued development of sensor technologies for weed assessment.