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Agricultural soil testing provides analytical information about soil chemistry, nutrient-related characteristics, salinity and other conditions that can support land, crop and soil-management decisions.
PBR Laboratories provides agricultural soil testing support from Edmonton for growers, agricultural businesses, consultants and land-management projects throughout Alberta, Western Canada and Canada.
PBR's documented soil chemistry capabilities relevant to agricultural soil include:
The appropriate testing program depends on the soil, sampling depth, land use, management question and decision the analytical results need to support.
Agricultural soil testing measures selected chemical characteristics of soil to help characterize conditions relevant to crop production, land management and soil-quality decisions.
Testing may help answer questions such as:
A laboratory result should be interpreted in the context of soil type, sampling location, sampling depth, season and management objective.
Soil pH indicates whether the submitted soil sample is acidic, neutral or alkaline under the applicable analytical method.
pH can influence:
What does a soil pH result mean?
The result provides a measured pH for the submitted sample.
It should be interpreted alongside the soil type, field conditions and management objective rather than as a standalone value.
Electrical conductivity provides information related to the soluble ionic content of the soil extract.
It is commonly used to evaluate salinity-related conditions.
Why does salinity matter?
Elevated soluble salts can affect soil behaviour and plant performance.
The significance of an electrical conductivity result depends on:
Electrical conductivity does not describe sodicity, so it should not be used as a substitute for sodium adsorption ratio.
Sodium adsorption ratio provides information about the relative amount of sodium compared with calcium and magnesium.
It can support assessment of sodicity-related soil conditions.
What is the difference between salinity and sodicity?
Salinity relates to soluble salts.
Sodicity relates to the relative dominance of sodium in the soil system.
They are related but different conditions, which is why electrical conductivity and sodium adsorption ratio answer different analytical questions.
Related Resource: Soil pH, Electrical Conductivity, SAR & Salinity Explained →
PBR's current soil chemistry capabilities include total nitrogen.
Nitrogen testing can contribute to soil characterization and agricultural or environmental assessment.
The result should be interpreted in relation to the analytical method, sampling depth and management objective.
PBR's documented soil chemistry capabilities include total phosphorus.
Testing may support:
A total phosphorus result does not automatically provide a complete agronomic fertilizer recommendation.
PBR's current soil testing information includes total potassium.
The result can contribute to soil characterization and comparison between fields or samples.
Interpretation should reflect the test method and intended use of the result.
PBR also documents total sulfur among its soil chemistry capabilities.
Sulfur results can support selected agricultural and environmental soil-characterization objectives.
Cation exchange capacity provides information related to the soil's ability to retain positively charged ions.
It may help characterize soil properties relevant to:
Does a higher cation exchange capacity always mean "better" soil?
Not necessarily.
The result describes one soil property and should be interpreted in the context of soil texture, chemistry and management objectives.
Total organic carbon measures carbon associated with organic material in the submitted soil sample under the applicable analytical method.
Depending on the application, it may support:
Organic carbon results should be interpreted with the soil type and project objective in mind.
PBR's existing Soil Chemical Testing services also identify major anions and cations among the available analytical parameters.
These measurements can provide additional information relevant to:
The appropriate ion panel should be based on the question being investigated.
Agricultural and environmental soil testing may use some of the same analytical parameters, but they support different decisions.
| Agricultural Soil Testing | Environmental Soil Testing |
|---|---|
| Focuses on soil condition and land-management questions | Focuses on contamination and environmental investigation |
| pH, EC, nutrients, SAR, CEC, organic carbon | Hydrocarbons, metals, contaminants, chemistry |
| Supports agricultural characterization | Supports site assessment and remediation |
| Often compares fields or management zones | Often compares source, background and impacted areas |
A project can involve both where agricultural land also has an environmental concern.
The usefulness of agricultural soil results depends strongly on how the samples are collected.
Important factors include:
A single grab sample may not adequately represent a large or variable field.
PBR's decision framework emphasizes representative sampling when analytical results are used to support broader land or lot-level decisions.
Ask PBR about sample requirements before collecting agricultural soil samples.
Composite sampling can be useful in agricultural applications where the objective is to obtain an average representation of a defined field or management zone.
However, the composite should only combine samples that genuinely belong to the same decision area.
When can compositing create a problem?
Combining soil from:
can obscure meaningful differences.
The sampling plan should therefore match the management decision.
There is no universal testing interval that applies to every field.
The appropriate frequency depends on:
Testing should be scheduled around a defined management question rather than performed only because a fixed number of years has passed.
Trend comparison can be useful when:
For meaningful comparison, try to keep:
consistent where possible.
Changing several variables at the same time can make trend interpretation difficult.
An unexpected result does not automatically mean the laboratory value is wrong.
The investigation may need to consider:
The correct next step depends on the parameter and management question.
The PBR material used for this page supports analytical soil testing, including pH, conductivity, nutrient-related parameters, sodium adsorption ratio, cation exchange capacity, organic carbon and major ions.
It does not establish a broad agronomic fertilizer-recommendation service.
Therefore, PBR should position this service as providing analytical data that can support agricultural decisions, while crop-specific fertilizer recommendations should be made using the appropriate agronomic expertise where required.
This distinction protects technical accuracy and keeps PBR within its verified scope.
Agricultural chemistry parameters can also be useful in reclamation and land-restoration projects.
Relevant testing may include:
Testing can help compare soil characteristics across locations or time points as part of a broader reclamation program.
Related Application: Remediation & Reclamation Soil Testing →
PBR Laboratories provides agricultural soil testing support from Edmonton, Alberta.
PBR can support Alberta agricultural and land-management projects requiring laboratory data for:
Alberta's agricultural landscapes can vary significantly, making representative field sampling and clear management zones important when interpreting analytical results.
PBR supports agricultural, reclamation and land-management projects throughout Western Canada with soil chemistry testing selected around the matrix and management objective.
The testing program should focus on the parameters that answer the actual soil question rather than using a large generic panel without purpose.
PBR supports Canadian clients requiring analytical soil information for agricultural, land-management and reclamation applications.
The PBR decision pathway is:
define the field or management question → collect representative samples → test relevant soil parameters → interpret results in context → make the appropriate land-management decision
Depending on the objective, agricultural soil testing may measure pH, electrical conductivity, sodium adsorption ratio, total nitrogen, phosphorus, potassium, sulfur, cation exchange capacity, total organic carbon and major ions.
Yes. PBR's documented soil chemistry capabilities include total nitrogen, phosphorus, potassium and sulfur.
Soil pH indicates whether the submitted sample is acidic or alkaline and can influence nutrient availability, chemical behaviour and other soil processes.
Electrical conductivity provides information related to soluble salts and is commonly used in evaluating salinity-related conditions.
Sodium adsorption ratio evaluates the relative amount of sodium compared with calcium and magnesium and is used in assessing sodicity-related conditions.
No. Salinity relates to soluble salts, while sodicity relates to sodium dominance. Electrical conductivity and sodium adsorption ratio provide different information.
Cation exchange capacity is a measure related to the soil's ability to retain positively charged ions. It is one part of broader soil characterization.
Not necessarily. Large or variable fields usually require a sampling plan designed around the field or management zone being evaluated.
Composite sampling can be appropriate where multiple increments represent the same management zone, but samples from meaningfully different soils, depths or conditions should not automatically be combined.
The verified PBR material supports laboratory soil analysis but does not establish a broad crop-specific fertilizer recommendation service. PBR can provide analytical soil results for use in agricultural decision-making.
Yes. PBR supports clients throughout Alberta, Western Canada and Canada.
Tell PBR:
PBR can discuss available soil chemistry testing and sample requirements before submission.