Soil compaction can restrict root development and limit crop performance. To better understand how compaction tillage and prescription tillage technology can be used to manage soil compaction more precisely, Väderstad conducted a compaction tillage study near Davidson, Saskatchewan, Canada. The study combined compaction mapping, automated depth control and a Wil-Rich 357 Inline Ripper to evaluate site-specific tillage under practical field conditions.
Soil compaction can restrict root development, limiting the crop's ability to access water and nutrients. In reduced tillage and no-till systems, compaction may remain in the soil when natural freeze-thaw cycles are insufficient to alleviate compacted layers. This can have a direct impact on crop growth and yield potential.
Because soil compaction often varies throughout a field and at different depths, farmers face the challenge of identifying where compaction exists and determining the appropriate tillage depth to address it.
Advances in field mapping technology have made it possible to apply seed and fertiliser according to local field conditions. The same principle can be applied to compaction tillage.
The compaction tillage study was carried out near Davidson, Saskatchewan, Canada, using two fields with different soil types and residue conditions. The objective was to use soil compaction mapping and site-specific depth adjustments to perform compaction tillage only where required and only to the depth necessary.
A Wil-Rich 357 Inline Ripper equipped with an E-Services control system was used as the test platform. The system enabled automated depth adjustments based on prescription tillage maps generated from field measurements.
The low-disturbance configuration with 3-inch points was evaluated in the South field on 24 October. The minimal-disturbance configuration with 8-inch points was evaluated in the South field on 1 November and in the North field on 2 and 5 November.
Two configurations were evaluated during the study:
The North field showed greater variation in soil compaction than the South field, resulting in larger variations in working depth during the compaction tillage operation.
Soil compaction measurements were collected using EarthOptics technology. A probe mounted on a utility vehicle measured compaction to a depth of 18 inches. The measurements were combined with soil conductivity data to generate detailed compaction maps for both study fields.
Soil compaction mapping was completed on 22 October prior to the tillage operations. The compaction maps were then used to create prescription tillage plans for the North and South fields. Compaction mapping identified different compaction patterns at depths of 3, 12 and 18 inches.
The prescription maps were uploaded to the machine control system, allowing working depth to be adjusted according to the depth and severity of soil compaction within different areas of the field.
The compaction tillage study demonstrated that soil compaction varied considerably across both fields and at different depths. This variation highlighted the potential value of prescription tillage compared with applying a uniform tillage depth across the entire field.
The study also showed that automated depth control could respond to prescription tillage maps and adjust working depth according to changing field conditions.
Initial testing confirmed that the prescription tillage system responded according to the uploaded compaction maps before full-scale field operations began.
Researchers observed that actual tillage depth could vary by approximately two inches due to differences in data transfer between field measurements and software systems.
Following tillage, surface finish was evaluated using the Cr index, where lower values indicate a smoother soil surface.
The minimal-disturbance configuration with 8-inch points produced lower Cr values and therefore a smoother surface finish than the low-disturbance configuration equipped with 3-inch points.
Because only the minimal-disturbance configuration was used in the North field, no direct comparison between configurations was carried out there.
Location |
Tines |
Points |
Cr value |
| South low spot | Low disturbance | 3 inches | 0.11 |
| South low spot | Minimal disturbance | 8 inches | 0.08 |
| South level spot | Low disturbance | 3 inches | 0.12 |
| South level spot | Minimal disturbance | 8 inches | 0.09 |
| North level spot | Minimal disturbance | 8 inches | 0.11 |
Prior to spring drilling in 2026, both fields will be re-analysed using a penetrometer to evaluate the effect of winter freeze-thaw cycles on soil compaction levels.
Crop development will then be monitored throughout the growing season, followed by yield analysis at harvest. The final stage of the project will assess both the agronomic impact and potential return on investment of prescription-based compaction tillage.
The results demonstrate that soil compaction can vary considerably within the same field and at different depths. This supports the principle of matching compaction tillage depth to local field conditions rather than applying the same tillage intensity everywhere.
The study also shows how soil compaction mapping and automated depth control can be combined to create a more site-specific tillage operation. By targeting compacted layers only where they occur, farmers may be able to reduce unnecessary soil disturbance while still addressing compaction issues effectively.
Further assessment during the 2026 season will determine the impact on crop performance and economic return.
The Wil-Rich 357 Inline Ripper is ideal for heavy residue conditions, featuring a strong, rugged design that penetrates even the hardest ground. It is available with rigid or spring reset options, and multiple tine options, including parabolic, minimal disturbance, and low disturbance tines. Break up compaction layers as deep as 41 cm (16") and promote better water infiltration and root growth.
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