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Analysis of Spatial Distribution of Common Lambsquarters (Chenopodium album) in No-Till Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

John Cardina ,
Denise H. Sparrow  and
Edward L. McCoy
John Cardina
Affiliation:
Dep. Hortic. and Crop Sci., and Sc. Nat. Res., Oh. Agric. Res. and Dev. Ctr., Ohio State Univ., Wooster, OH 44691
Denise H. Sparrow
Affiliation:
Dep. Hortic. and Crop Sci., and Sc. Nat. Res., Oh. Agric. Res. and Dev. Ctr., Ohio State Univ., Wooster, OH 44691
Edward L. McCoy
Affiliation:
Dep. Hortic. and Crop Sci., and Sc. Nat. Res., Oh. Agric. Res. and Dev. Ctr., Ohio State Univ., Wooster, OH 44691
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Abstract

The nonuniform spatial distribution of weeds complicates sampling, modeling, and management of weed populations. Principles of a rational approach to analysis of weed spatial distribution, combining classical and spatial statistics, are presented using data for cumulative emergence of common lambsquarters in no-tillage soybean fields in 1990 and 1993. Classical statistics, dispersion indices, mean/variance relationships, and frequency histograms confirmed that raw and loge-transformed data were not normally distributed, that populations were aggregated, and that large-scale trends in population means violated assumptions of spatial statistics. Detrending was accomplished by median polishing loge-transformed data and confirmed by evaluation of standardized residuals and frequency histograms. Detrended residuals were used to construct omni-directional and uni-directional semivariograms to describe the spatial structure of the populations. A spherical model fit to the data was verified by cross validation. Semivariograms showed that common lambsquarters density was spatially autocorrelated at distances to 16 m, with more than 30% of the variance in density due to distance between field locations. Comparisons of kriged estimates and their standard deviations with and without detrending indicated that estimates using detrended data were more appropriate and more precise. Kriged estimates of common lambsquarters density were used to draw contour maps of the populations.

Keywords

Common lambsquarters, Chenopodium album L. #3 CHEALsoybean, Glycine max (L.) MerrGeostatisticsvariogrampattern analysiskriging
Type
Weed Biology and Ecology
Information
Weed Science , Volume 43 , Issue 2 , June 1995 , pp. 258 - 268
Copyright
Copyright © 1995 by the Weed Science Society of America 

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