Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 356905
Title Are weed patches stable in location? Application of an explicitly two-dimensional methodology
Author(s) Heijting, S.; Werf, W. van der; Stein, A.; Kropff, M.J.
Source Weed Research 47 (2007)5. - ISSN 0043-1737 - p. 381 - 395.
Department(s) Crop and Weed Ecology
Mathematical and Statistical Methods - Biometris
Publication type Refereed Article in a scientific journal
Publication year 2007
Keyword(s) glycine-max fields - spatial-distribution - seedling populations - winter-wheat - stability - pattern - scale - distributions - parameters - dependence
Abstract Field observations were made in three years continuous maize cultivation in the Netherlands to study the spatial pattern and stability of spatial pattern over time in agricultural weeds. Two-dimensional correlograms were made, using data from single years, to characterise spatial correlation and pattern, while data from two different years were used to calculate correlation over space and time, to characterise the stability of pattern. Weeds that were able to attain high recruitment also exhibited the strongest spatial correlations. These weeds were Echinochloa crus-galli, Chenopodium album, Chenopodium polyspermum and Solanum nigrum. Weeds that were less successful in attaining high densities in the maize rotation, also showed less spatial correlation. Wind dispersing Compositae, e.g. Taraxacum officinale, had spatially uncorrelated patterns. All weeds that showed spatial correlation also showed stability in space, except E. crus-galli. The latter species showed marked population increase and the locations and extent of its patches changed over the years. Statistical interpretation of the data is discussed, as are potential consequences for site-specific management and optimal sampling of weeds.
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