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Using Soil Electrical Conductivity to Improve Nutrient Management

^a Dep. of Crop Sci., North Carolina State Univ., Raleigh, NC 27695
^b Dep. of Soil Sci., North Carolina State Univ., Raleigh, NC 27695
^c Plant Sci. Dep., South Dakota State Univ., Brookings, SD 57007

View larger version (22K): [in a new window]   Fig. 1. Relationship between apparent soil electrical conductivity (ECa) and soil test concentrations of P on field B533 in the tidewater region of North Carolina in 1997. Individual regressions represent the three different soil series present in the field and the relationship between ECa and P concentrations within each soil series.

View larger version (46K): [in a new window]   Fig. 2. Maps of apparent soil electrical conductivity (ECa) and soil test concentrations of P on field GR1 in the tidewater region of North Carolina in 1999. Sites denoted as feeding areas and a fence line were the points in the field where manure deposition was the greatest. The feeding bunks and fence line were removed several months before ECa and nutrient measurements were taken.