Effects of Soil Resistivity Variation with Depth on Crop Yield in a Typical Sedimentary Terrain: A Geophysical Method Application in Agricultural Practice

Accurate knowledge of soil fertility is required to promote global food security for life sustenance. Literatures have shown that electrical resistivity method effective agricultural site selection without passing through the rigor test. However, factor responsible inconsistence in signature with from one place another, effect texture and depth variation on crop yield are questions this work geared at providing answers. Ten Vertical Electrical Sounding (VES) were done across study area using Schlumberger array. Res1Dinvers was used inversion model, Least Square method. Twenty samples obtained VES points, two per point. One each first second layer. Result showed areas high-excellent above 500 Ωm while low characterized by values less than Ωm. In both yield, result geochemical analysis indicated Nitrogen, phosphate, Potassium varied as 59-61%, 43-54mg/kg 49-51mg/kg, respectively except organic matter content 3.8% layer their even if layer’s 3.8%. This has significant others nutrients (Phosphate, Nitrogen). The shows soil’s (0-0.3m) most suitable good minerals occurrence optimum output, affect geological terrain inconsistency fertility.