Mapping of soil micronutrients in an European Atlantic agricultural landscape using ordinary kriging and indicator approach

Dafonte, J, Guitian, M, Paz-Ferreiro, J, Siqueira, G and Vidal-Vazquez, E 2010, 'Mapping of soil micronutrients in an European Atlantic agricultural landscape using ordinary kriging and indicator approach', Bragantia, vol. 69, no. suppl, pp. 175-186.


Document type: Journal Article
Collection: Journal Articles

Title Mapping of soil micronutrients in an European Atlantic agricultural landscape using ordinary kriging and indicator approach
Author(s) Dafonte, J
Guitian, M
Paz-Ferreiro, J
Siqueira, G
Vidal-Vazquez, E
Year 2010
Journal name Bragantia
Volume number 69
Issue number suppl
Start page 175
End page 186
Total pages 12
Publisher Instituto Agronômico de Campinas
Abstract Nutrient maps based on intensive soil sampling are useful to develop site-specific management practices. Geostatistical methods have been widely used to determine the spatial correlation and the range of spatial dependence at different sampling scales. If spatial dependence is detected, the modelled semivariograms can then be used to map the interested variable by kriging, an interpolation method that produces unbiased estimates with minimal estimation variance. The objectives of this paper were to examine and to map the spatial distribution of the micronutrients Cu, Zn, Fe and Mn on an agricultural area in Galicia, Spain, under European Atlantic climatic conditions. The ordinary kriging was first used to determine the values for the non-sampled locations, then the indicator approach was used to transform the micronutrient content values into binary values having the mean values of each nutrient as the threshold content. All four elements analyzed showed spatial dependence using the indicator semivariograms. The strength of spatial dependence was assessed using the values of nugget effect and range from the semivariogram, the fitted range values decreased in the order Mn >Fe >Zn >Cu. The spatial dependence of the combination of two or more of the studied micronutrients was also examined using indicator semivariograms. In opposition to spatial analysis of individual microelements, indicator semivariograms obtained for the binary coding of the variables showed a great nugget effect value or a low proportion of sill. The maps for each nutrient obtained using indicator kriging showed some similarity in the spatial distribution, suggesting the delimitation of uniform management areas.
Subject Environmental Engineering not elsewhere classified
Keyword(s) Geostatistics
Soil chemistry
Soil management
Spatial variability
DOI - identifier 10.1590/S0006-87052010000500018
Copyright notice © 2-s2.0-79952763243
ISSN 0006-8705
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