Do you know how much money your farm leaves on the field every year by fertilizing ‘by eye’? Our experience shows that without a soil analysis-based fertilization plan, the average crop farm loses €30–60/ha per year — whether through over-fertilization, wrong timing, or missing nutrients.
A professional fertilization plan is not just a document. It is an action plan that helps achieve the planned yield target as efficiently as possible — without wasting fertilizer, harming the environment, or losing control of costs.
What a professional fertilization plan actually contains
Many think a fertilization plan simply means a schedule for how many bags of nitrogen to spread per hectare. In reality, it is much more thorough work.
Soil sample analysis. Everything starts with knowing the actual condition of the soil. Soil samples provide an overview of nitrogen (N), phosphorus (P), potassium (K), pH level, and micronutrient content. Without this information, fertilizing is like prescribing medicine without a diagnosis.
Crop nutrient requirement calculation. Each crop requires different amounts of nutrients, depending on the yield target. Calculations are made in kilograms of active ingredient per hectare — N, P, and K, not by the physical mass of fertilizer or oxide form (P₂O₅, K₂O). This is an important detail that beginners easily confuse.
Fertilization round planning. A good plan specifies exactly when to fertilize — timing is based on the crop growth stage (BBCH scale). For winter wheat, this typically means three rounds: early spring to support growth resumption, at the stem elongation stage for nitrogen application, and finally for quality grain formation. Too early, too much, or at the wrong time — all of this means cost without return.
Fertilizer selection and quantity calculation. There are dozens of different fertilizers on the market. A professional consultant considers crop needs, existing soil analyses, as well as fertilizer availability and price. For example, for winter wheat, a combination of Yara Polaris, Axan 27, and Sulfanit is often used, depending on the fertilization rounds and sulfur requirements.
Previous crop and organic fertilizer accounting. If liquid manure, sewage sludge, or nitrogen from growing clover has previously been applied to the field, this must be deducted from nutrient calculations. This step is often skipped — and you end up paying double.
Cost calculation. A proper plan always includes a budget: what everything costs, what the projected yield revenue is, and where there are opportunities to optimize.
Practical example: winter wheat fertilization plan
Let’s look at a specific example. Winter wheat, yield target 5.5 t/ha, three fertilization rounds from March to May.
The total nitrogen requirement in this case is approximately 120–150 kg N/ha of active ingredient, depending on the previous crop and soil organic matter content. After legumes (peas, beans, clover), the requirement may be 20–40 kg/ha lower, as the previous crop leaves biologically fixed nitrogen in the soil. If the soil organic carbon content exceeds 5%, the mineral nitrogen rate can be reduced by up to 30%. Phosphorus and potassium amounts depend on the soil analysis — if there is already enough in the soil, additional application is not necessary.
Round 1 (March–April, growth resumption, BBCH 21-25): approx. 35–50 kg N/ha, often as ammonium nitrate (e.g., Axan 27) — the first application should be moderate, as winter wheat absorbs only 1–1.5 kg N/ha per day in cool spring conditions
Round 2 (April–May, stem elongation, BBCH 31-37): approx. 50–60 kg N/ha, nitrogen + sulfur (e.g., Sulfanit) — the most critical phase for yield formation, when productive tillers and the number of grains per head are determined
Round 3 (May–June, flag leaf stage, BBCH 37-49): approx. 20–40 kg N/ha — a quality application to increase grain protein content
The entire plan is designed so that every kilogram of active ingredient goes where the crop actually needs it and can utilize it.
Precision fertilization: tools that make the difference
In modern agriculture, you no longer need to fertilize the entire field at a uniform rate. Precision farming solutions allow you to account for within-field variability.
The Augmenta scanner measures the crop nitrogen index in real time and provides recommendations for variable rate application. The ISARIA plant sensor measures crop chlorophyll content and biomass in real time; its ISARIA CONNECT data management system stands out because the fertilisation algorithm accounts not only for current crop data but also for historical yield maps — if a particular area of the field has not produced good yields over the years, the system automatically limits the rate there, even if the crop currently shows high biomass. N-Tester allows quick assessment of leaf nitrogen content directly in the field. RTK-based variable rate fertilization ensures that each point in the field receives exactly as much fertilizer as it needs — no more, no less. John Deere Operations Center connects machine data, field maps, and fertilization recommendations in one environment. Yara fertilizer requirement maps help plan rate variability across the field.
These tools do not replace agronomic knowledge — they amplify it. An experienced consultant knows when and how to apply these solutions so that the investment pays off.
Crop protection plan — a logical extension of the fertilization plan
A professional fertilization plan and crop protection plan go hand in hand. A well-nourished crop is stronger, but that doesn’t mean diseases, pests, and weeds will retreat on their own. An integrated approach means that herbicide, fungicide, and insecticide applications are planned together with fertilization rounds — allowing shared machine passes, optimized tank mixes, and proper active ingredient rotation to avoid resistance development.
AgriConsul prepares crop protection plans in addition to fertilization plans, giving the farmer a complete set of growth tools from a single source.
Get in touch — the first consultation is free
AgriConsul OÜ founder Marek Ruiso has worked in agricultural consulting for over 20 years. He is a METK certified consultant (crop production, management, rural economy) and has advised over 13,900 hectares of farmland.
The cost of professional consulting does not have to be a barrier — the PRIA consulting subsidy covers part of the consulting fee, making a professional fertilization plan accessible even for smaller enterprises.
Want to know what fertilization plan suits your farm? The first few hours are free — let’s talk and assess your situation together.