Agrochemical Soil Analysis: How to Increase Yields and Reduce Fertilizer Costs

Soil can no longer be viewed as a homogeneous medium – it is a complex system that directly determines the economics of a field. That is why agrochemical soil analysis has evolved from an optional procedure into a core tool for managing yields, costs, and production risks.

This article explains what soil analysis actually reveals, what real data we have for Ukraine, and how these figures can be transformed into practical agronomic and financial decisions.

Agrochemical soil analysis is a comprehensive laboratory assessment that reflects the actual condition of soil within a specific field or its individual zones. Its primary purpose is to provide an objective answer to a key question: what exactly limits crop productivity and where resources are being used inefficiently.

Within the scope of soil analysis, the following parameters are determined:

soil acidity (pH);
humus (organic matter) content;
availability of macronutrients – nitrogen, phosphorus, and potassium (NPK);
when required – micronutrients, salinity, and other limiting factors.

Important: an analysis without spatial reference provides only an “average value.” That is why modern approaches rely on soil sampling with GPS coordinates and the creation of agrochemical soil maps, which are then used for variable-rate application.

Why “Average Application Rates” No Longer Work

One of the most common mistakes in crop production is treating a field as uniform. In reality, soils within the same field can differ significantly in acidity, nutrient reserves, and yield potential.

When fertilizers are applied at an average rate across the entire field, a farm faces two types of systematic losses:

Over-application in zones where plants are unable to efficiently utilize additional nutrients.
Under-application in productive areas that could deliver substantially higher yields.

Agrochemical soil analysis converts these hidden losses into clear data, maps, and actionable decisions.

Soil Fertility in Ukraine: What the Data Shows

According to the results of state agrochemical soil monitoring in Ukraine (2016–2025):

in certain regions, gradual soil acidification is observed due to insufficient liming and the use of acidic fertilizers;
humus content remains at a low level or slowly declines as a result of organic matter deficiency;
low availability of readily hydrolysable nitrogen remains the key limiting factor;
phosphorus and potassium availability is generally moderate to high and depends on the fertilization system.

These factors have a straightforward practical interpretation: nitrogen availability and soil acidity remain the main limiting factors, while phosphorus and potassium are often applied by inertia, without proper consideration of the actual soil condition.

How Soil Sampling Should Be Performed

The accuracy of agrochemical soil analysis directly depends on the sampling methodology. A professional approach includes:

dividing the field into zones or using a regular grid;
maintaining a consistent sampling depth;
eliminating subjective “visual selection” of sampling points;
ensuring precise GPS positioning of each sample.

Only this approach allows for repeatable results over time and correct tracking of soil fertility dynamics.

Soil Fertility Maps and Variable-Rate Fertilizer Application

Soil analysis results are used to create soil fertility maps and application task maps for agricultural machinery. This forms the basis of variable-rate fertilization, where each zone of the field receives exactly the amount of nutrients it requires.

In practice, this makes it possible to:

reduce fertilizer overuse in weak zones;
increase nutrient efficiency in productive areas;
stabilize yields during challenging seasons;
make input costs more predictable.

Field comparisons in Ukraine show that a variable-rate approach based on agrochemical soil analysis increases yields by 5-15% and reduces fertilizer use by up to 15-25%, depending on crop type and field variability.

How Often Should Agrochemical Soil Analysis Be Conducted?

The optimal frequency is once every 3-4 years. However, soil analysis becomes essential when:

a farm transitions to variable-rate application;
yields are unstable without clear reasons;
the fertilization system or crop rotation changes;
significant investments in technology are planned.

Regular analysis not only enables rate adjustments but also helps monitor soil degradation or recovery over time.

Questions Every Farmer Asks

How much does agrochemical soil analysis cost?
The cost depends on the selected parameters, sampling grid density, and total area. The most accurate approach is to evaluate costs not “per field,” but per hectare and per sampling point.

What is more important – pH or NPK?
pH is a fundamental parameter. Under problematic acidity, even sufficient phosphorus reserves may become unavailable to plants.

Does soil analysis deliver an economic return?
Yes. The economic effect comes from two sources: savings on unnecessary fertilizer applications and yield increases in productive zones.

Agrochemical soil analysis is not a laboratory expense.
It is a field economics management tool that enables decision-making based on data rather than assumptions.

Precision starts with soil.
And soil is what ultimately determines whether your fertilizers, technologies, and investments truly work.