How can it be determined if soil is out-of-bounds for a CS650-L or a CS655-L?

If information is available on soil texture, organic matter content, and electrical conductivity (EC) from soil surveys or lab testing of the soil, it should be possible to tell if the soil conditions fall outside the range of operation of the sensor. Without this information, an educated guess can be made based on soil texture, climate, and management:

  • Soil that is coarse textured (such as sand, loamy sand, or sandy loam) works well with a CS650-L if the EC is low.
  • If the soil is located in an arid or semiarid region, it may have high EC.
  • If the soil is frequently fertilized or irrigated with water that has higher EC, it may have high EC.
  • If the climate provides enough rain to flush accumulated salts below the root zone, the EC is expected to be low and suitable for a CS650-L.

When in doubt about soil texture and electrical conductivity, Campbell Scientific recommends using a CS655-L because of the sensor’s wider range of operation in electrically conductive soils, as compared with the CS650-L.

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