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Estimating economic thresholds for site‐specific weed control using manual weed counts and sensor technology: An example based on three winter wheat trials

Estimating economic thresholds for site‐specific weed control using manual weed counts and sensor... BACKGROUND Precision experimental design uses the natural heterogeneity of agricultural fields and combines sensor technology with linear mixed models to estimate the effect of weeds, soil properties and herbicide on yield. These estimates can be used to derive economic thresholds. Three field trials are presented using the precision experimental design in winter wheat. Weed densities were determined by manual sampling and bi‐spectral cameras, yield and soil properties were mapped. RESULTS Galium aparine, other broad‐leaved weeds and Alopecurus myosuroides reduced yield by 17.5, 1.2 and 12.4 kg ha−1 plant−1 m2 in one trial. The determined thresholds for site‐specific weed control with independently applied herbicides were 4, 48 and 12 plants m−2, respectively. Spring drought reduced yield effects of weeds considerably in one trial, since water became yield limiting. A negative herbicide effect on the crop was negligible, except in one trial, in which the herbicide mixture tended to reduce yield by 0.6 t ha−1. Bi‐spectral cameras for weed counting were of limited use and still need improvement. Nevertheless, large weed patches were correctly identified. CONCLUSION The current paper presents a new approach to conducting field trials and deriving decision rules for weed control in farmers' fields. © 2013 Society of Chemical Industry http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Pest Management Science Wiley

Estimating economic thresholds for site‐specific weed control using manual weed counts and sensor technology: An example based on three winter wheat trials

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References (30)

Publisher
Wiley
Copyright
"© 2014 Society of Chemical Industry"
ISSN
1526-498X
eISSN
1526-4998
DOI
10.1002/ps.3545
pmid
23553904
Publisher site
See Article on Publisher Site

Abstract

BACKGROUND Precision experimental design uses the natural heterogeneity of agricultural fields and combines sensor technology with linear mixed models to estimate the effect of weeds, soil properties and herbicide on yield. These estimates can be used to derive economic thresholds. Three field trials are presented using the precision experimental design in winter wheat. Weed densities were determined by manual sampling and bi‐spectral cameras, yield and soil properties were mapped. RESULTS Galium aparine, other broad‐leaved weeds and Alopecurus myosuroides reduced yield by 17.5, 1.2 and 12.4 kg ha−1 plant−1 m2 in one trial. The determined thresholds for site‐specific weed control with independently applied herbicides were 4, 48 and 12 plants m−2, respectively. Spring drought reduced yield effects of weeds considerably in one trial, since water became yield limiting. A negative herbicide effect on the crop was negligible, except in one trial, in which the herbicide mixture tended to reduce yield by 0.6 t ha−1. Bi‐spectral cameras for weed counting were of limited use and still need improvement. Nevertheless, large weed patches were correctly identified. CONCLUSION The current paper presents a new approach to conducting field trials and deriving decision rules for weed control in farmers' fields. © 2013 Society of Chemical Industry

Journal

Pest Management ScienceWiley

Published: Feb 1, 2014

Keywords: ; ; ;

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