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Using low-cost geophysical survey to map soil properties and delineate management zones on grazed permanent pastures

  • Francisco J. Moral
  • João M. Serrano
Article
  • 40 Downloads

Abstract

Usually, soils utilised for livestock production have similar high spatial variability as those for agricultural or forest use. As a consequence, it is necessary to determine the spatial patterns of the main soil properties as the first stage to implement site-specific management. However, this has to be performed using an inexpensive technique because the profitability in these types of farm are very low, so owners need a cheap, effective, and reliable method to know which zones have similar production potential. Using soil apparent electrical conductivity (ECa) measurements, obtained with a contact sensor at many locations, as the basis to perform a directed soil sampling, 10 samples were taken at two depths (0–0.25 m and 0.25–0.50 m) in a 2.3 ha field in Évora (southern Portugal). Firstly, relationships between ECa and many soil properties were analysed using regression analysis. Six soil properties (clay, silt, fine sand, soil moisture content, pH, and cation exchange capacity) were significantly correlated with ECa. Consequently, spatial distributions of these variables were visualised using map algebra techniques. Later, a fuzzy clustering algorithm was utilised to delineate management zones, resulting in two subfields to be managed separately. Finally, a principal component analysis was conducted to analyse the influence of the soil properties and elevation on the soil variability. It was determined that elevation and clay were the most important contributing properties. Therefore, these can be regarded as key latent variables in this soil. Results showed that low-cost data based on ECa surveys can be used to implement site-specific management in soils with permanent pastures, such as those in the montado or dehesa ecosystems, in the southwest of the Iberian Peninsula.

Keywords

Site-specific management Contact sensor Soil apparent electrical conductivity Principal component analysis 

Notes

Acknowledgements

This research was funded by the Junta de Extremadura and the European Regional Development Fund (ERDF) through the Project GR15050 (Research Group TIC008), by ERDF through the Operational Programme for Competitiveness Factors: COMPETE and National Funds through FCT: Foundation for Science and Technology under the Strategic Project PEst-C/AGR/UI0115/2011 and under the FCT Project: EXCL_AGR-TEC_0336_2012, and also by ERDF and the Spanish Ministry of Economy and Competitiveness through the Project AGL2015-65036-C3-3-R. The authors are also very grateful to two anonymous reviewers for providing constructive comments which contributed to improve the final version of this paper.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Departamento de Expresión Gráfica, Escuela de Ingenierías IndustrialesUniversidad de ExtremaduraBadajozSpain
  2. 2.Departamento de Engenharia Rural, Instituto de Ciências Agrárias e Ambientais Mediterrânicas (ICAAM), Escola de Ciências e TecnologiaUniversidade de ÉvoraÉvoraPortugal

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