Using secondary information sources to improve the within-field soil textural mapping in a layered alluvial soil

W.A.U. Vitharana; M. van Meirvenne; L. Cockx

Using secondary information sources to improve the within-field soil textural mapping in a layered alluvial soil

In: Precision Agriculture â05

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W.A.U. Vitharana

W.A.U. Vitharana U.Vitharana@UGent.be

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M. van Meirvenne

M. van Meirvenne
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L. Cockx

L. Cockx
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Type:: Chapter

Pages:: 425â432

DOI:: https://doi.org/10.3920/978-90-8686-549-9_053

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To evaluate the potential for precision agriculture, we explored the usefulness of secondary information to improve soil texture mapping. Our study area was an 11.5 ha field in a polder area where soils are known to be spatially heterogeneous, especially in the subsoil. Apparent electrical conductivity (EC_a) was measured with an EM38DD electromagnetic induction instrument. The geometric mean of the EC_a measured in both vertical and horizontal orientations showed a strong correlation with subsoil clay content (r = 0.89), but the correlation was less with the topsoil clay content (r = 0.36). Therefore another secondary information source was used to support the mapping of the topsoil clay content: the gravimetric water content at wilting point (Î¸g _{(-1.5 MPa)}) which showed a much stronger correlation (r = 0.92) with the clay content. Thereafter, topsoil and subsoil clay maps were obtained using 23 clay analyses, 77 Î¸g _{(-1.5 MPa)} and 4048 EC_a measurements and employing standardized ordinary co-kriging. Finally, three potential management zones were identified based on both top and subsoil clay content. This study indicated the importance of including the subsoil variability to delineate potential management zones.

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Precision Agriculture â05

E-Book ISBN:: 9789086865499

Publisher:: Wageningen Academic

Print Publication Date:: 24 Oct 2005

Subjects
- Life Sciences
  - General
  - Agriculture & Environment

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Using secondary information sources to improve the within-field soil textural mapping in a layered alluvial soil

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