According to research by CropX, spiral sensors offer the most accurate view of the actual moisture content of undisturbed soil in the field.
Ag analytics and soil sensing company CropX released results of a multiyear study on the impact of soil sensor geometry and installation method on moisture readings and irrigation. The study found that spiral sensor designs deliver the best accuracy.
“The occurrence of preferential flow in soil is well documented,” noted Guy Sela, CropX VP of Agronomy. “The geometry of the soil sensor and the installation method greatly affect the accuracy of soil moisture readings as most sensors relay information based on preferential flow rather than the true moisture level in the soil. Spiral sensors offer the most accurate view of the actual moisture content of undisturbed soil in the field.”
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The study modeled the formation of preferential flow pathways around sensors with different geometries and quantified the difference between the soil moisture in undisturbed soil and the soil moisture reported by the sensors. Across different soil types (e.g., loamy, sandy, silty), soil depths and irrigation amounts/intervals, the study found that spiral sensors moisture readings mapped most closely to undisturbed soil.
“Spiral sensors offer the most accurate view of the actual moisture content of undisturbed soil in the field – reflecting the true moisture conditions across varying soil types and irrigation events,” added Sela. “It is time for the industry to recognise the critical role of spiral sensors for the next era of smart irrigation and soil health.”