DELINEATION OF HOMOGENEOUS ZONES BASED ON GEOSTATISTICAL MODELS ROBUST TO OUTLIERS

Author:

BARBOSA DANILO PEREIRA1ORCID,BOTTEGA EDUARDO LEONEL2ORCID,VALENTE DOMINGOS SÁRVIO MAGALHÃES1ORCID,SANTOS NERILSON TERRA1ORCID,GUIMARÃES WELLINGTON DONIZETE3ORCID

Affiliation:

1. Universidade Federal de Viçosa, Brazil

2. Universidade Federal de Santa Maria, Brazil

3. Instituto Federal Goiano, Brazil

Abstract

ABSTRACT Measures of the apparent electrical conductivity (ECa) of soil are used in many studies as indicators of spatial variability in physicochemical characteristics of production fields. Based on these measures, management zones (MZs) are delineated to improve agricultural management. However, these measures include outliers. The presence or incorrect identification and exclusion of outliers affect the variogram function and result in unreliable parameter estimates. Thus, the aim of this study was to model ECa data with outliers using methods based on robust approximation theory and model-based geostatistics to delineate MZs. Robust estimators developed by Cressie-Hawkins, Genton and MAD Dowd were tested. The Cressie-Hawkins semivariance estimator was selected, followed by the semivariogram cubic fit using Akaike information criterion (AIC). The robust kriging with an external drift plug-in was applied to fitted estimates, and the fuzzy k-means classifier was applied to the resulting ECa kriging map. Models with multiple MZs were evaluated using fuzzy k-means, and a map with two MZs was selected based on the fuzzy performance index (FPI), modified partition entropy (MPE) and Fukuyama-Sugeno and Xie-Beni indices. The defined MZs were validated based on differences between the ECa means using mixed linear models. The independent errors model was chosen for validation based on its AIC value. Thus, the results demonstrate that it is possible to delineate an MZ map without outlier exclusion, evidencing the efficacy of this methodology.

Publisher

FapUNIFESP (SciELO)

Subject

General Agricultural and Biological Sciences

Reference35 articles.

1. Delineation of management zones in an apple orchard in Greece using a multivariate approach;AGGELOPOOULOU K.;Computers and Electronics in Agriculture,2013

2. Bindings for the geospatial Data Abstraction Library;BIVAND R.,2016

3. Utilization of management zones in soy production in the Brazilian savanna;BOTTEGA E. L,2014

4. Precision agriculture applied to soybean: Part I - Delineation of management zones;BOTTEGA E. L.;Australian Journal of Crop Science,2017

5. Protocol for multivariate homogeneous zone delineation in precision agriculture;CÓRDOBA M. A.;Biosystems Engineering,2016

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