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L'apport des méthodes géophysiques au service de la caractérisation de la fertilité des sols

Abstract : To both adapt agricultural practices to plant demand and limit environmental impact of fertilization, we need to carefully know the soil characteristics, the latter being strongly variable in space and time. We present here the use of several subsurface geophysical tools, especially the electrical resistivity method, to characterise the soil fertility. Principles of electrical resistivity measurements as well as electricalsoundings, electrical arrays and electrical spatial prospection methods are first described. We then demonstrate that the soil structure, a key component of the physical soil fertility, can be described in situ by electrical resistivity in some simple cases: the soil clods highly compacted by traffic can be differentiated from the porous areas or the cracks. Nevertheless, the real geometry of compacted zones and the intensity of compaction cannot be interpreted from electrical measurements. Finally, we demonstrate that the nitrate content – as far as it is in the range of nitrate content for agricultural soils – does not modify the electrical resistivity signal. Thus, the latter cannot be used to interpret the chemicalfertility of soil.
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  • HAL Id : hal-02642939, version 1
  • PRODINRA : 172152

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Isabelle Cousin, Arlène Besson, Maud Seger, Guillaume Giot, Guy Richard, et al.. L'apport des méthodes géophysiques au service de la caractérisation de la fertilité des sols. Innovations Agronomiques, INRAE, 2012, 21, pp.13-29. ⟨hal-02642939⟩

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