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Sectioning remote imagery for characterization of Avena sterilis infestations. Part A: Weed abundance

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Abstract

Software was developed to spatially assess key crop characteristics from remotely sensed imagery. Sectioning and Assessment of Remote Images (SARI®), written in IDL® works as an add-on to ENVI®, has been developed to implement precision agriculture strategies. SARI® splits field plot images into grids of rectangular “micro-images” or “micro-plots”. The micro-plot length and width were defined as multiples of the image spatial resolution. SARI® calculates different indicators for each micro-plot, including the integrated pixel digital values. Studies on weed patches were done with SARI® using ground-truth data and remote images of two wheat plots infested with Avena sterilis at LaFloridaII and Navajas (Southern Spain). Patches of A. sterilis represented 47.5 and 19.2% of the field areas at the two locations, respectively; the infested areas were a combination of a few large and several small patches. At LaFloridaII, 2.1% of all patches were >500 m2 and 55.0% of all patches were smaller than 10 m2. Based on ground-truth weed abundance data, SARI® output includes geo-referenced and visual herbicide prescription maps, which could be used with variable-rate application equipment.

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Abbreviations

Wild oat:

Avena sterilis sp. sterilis L.

Wheat:

Triticum durum L.

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Acknowledgment

This research was partially financed by the Spanish Commission of Science and Technology through the projects AGL2007-60926 and AGL2010-15506.

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Authors and Affiliations

  1. Institute for Sustainable Agriculture, CSIC, Apartado 4084, 14080, Cordoba, Spain

    David Gómez-Candón, Francisca López-Granados, Juan J. Caballero-Novella, José M. Peña-Barragán, Montserrat Jurado-Expósito & Luis García-Torres

  2. Faculty of Agriculture and Forestry, University of Cordoba, Campus of Rabanales, Cordoba, Spain

    Alfonso García-Ferrer

Authors
  1. David Gómez-Candón
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  2. Francisca López-Granados
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  3. Juan J. Caballero-Novella
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  4. Alfonso García-Ferrer
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  5. José M. Peña-Barragán
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  6. Montserrat Jurado-Expósito
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  7. Luis García-Torres
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Correspondence to Luis García-Torres.

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Gómez-Candón, D., López-Granados, F., Caballero-Novella, J.J. et al. Sectioning remote imagery for characterization of Avena sterilis infestations. Part A: Weed abundance. Precision Agric 13, 322–336 (2012). https://doi.org/10.1007/s11119-011-9249-y

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