Building the Right Fertiliser Programme with Leaf and Soil Analysis

Why analyse at all?

Fertiliser decisions are often made out of habit or by copying the neighbour. Yet even two adjacent blocks can have very different soils. Analysis removes the guesswork.

• Soil analysis shows what the soil contains and the conditions that affect nutrient availability.
• Leaf analysis shows how much of those nutrients the tree actually takes up.

Read together, they give the real picture. A nutrient that is adequate in the soil may not reach the tree because of high pH or lime. Looking at only one of them means making an incomplete decision.

When to sample soil

• Before planting: This is the most important analysis. Correcting pH, lime, salinity or organic matter before planting is far easier than after. The results also guide rootstock choice.
• In established orchards: Repeating the analysis every two to three years is usually enough. Problem blocks can be checked more often.

How to take a soil sample

1. Divide the orchard into uniform blocks by soil type, slope, rootstock and variety. Sample each block separately.
2. In each block, walk a zigzag pattern and collect subsamples from many points.
3. For fruit trees, take separate samples from the upper and lower layers to represent the root zone.
4. In drip-irrigated orchards, sample within the wetted zone, but not right next to the dripper.
5. Avoid fertiliser bands, orchard edges, tracks and spots where manure or fertiliser was stored.
6. Mix the subsamples in a clean bucket, put a representative portion in a labelled bag and send it to the lab.

When and how to take a leaf sample

For cherries, take leaf samples between mid and late summer. Leaf nutrient levels are relatively stable at this stage and can be compared with reference values.

• Choose fully developed leaves from the middle of current-season shoots.
• Pick each leaf with its petiole.
• Collect 60–100 leaves in total from many trees spread across one uniform block.
• Skip leaves with disease, insect damage or mechanical injury.
• Do not sample right after a foliar fertiliser or spray application.
• Put the sample in a paper bag, label it and get it to the lab without delay.

If you want to understand a problem area, sample good-looking and poor-looking trees separately. A comparison tells you far more than a single result.

How to read the results

Sufficiency ranges

Leaf analysis reports usually give a range for each nutrient: deficient, low, sufficient, high and excessive. The goal is to keep every nutrient in the sufficient range. More is not better. Excess nitrogen can drive overly vigorous shoot growth and lower fruit quality. An excess of one nutrient can also block the uptake of another.

Key values in a soil report

• pH: The main factor in nutrient availability. On high-pH soils, iron, zinc and manganese uptake becomes difficult.
• Lime: Total and active lime levels affect the risk of iron chlorosis and the choice of rootstock.
• Organic matter: It drives soil structure, water holding and microbial life. If it is low, organic matter management belongs in the programme.
• Salinity (EC): Cherry is salt-sensitive. High EC calls for a joint look at irrigation water and drainage.
• Texture: The share of sand, silt and clay affects irrigation frequency and how nutrients move in the soil.

Turning results into a programme

Analysis is a starting point, not a programme in itself. When you build the programme, ask:

1. Which nutrients are short, and which are in excess?
2. Is a deficiency caused by absence in the soil, or by poor uptake?
3. What are the yield target and the tree's vigour?
4. How should the nutrient be applied: to the soil, through fertigation, or as a foliar spray?
5. When will the application be most effective?

Then apply the programme and measure its effect with the next leaf analysis. This cycle makes your fertiliser programme a little more precise every year.

Sample the same blocks, at the same time of year, with the same method. Work with the same lab when you can. Keep the results in one file, together with the fertilisers applied, yields and fruit quality notes. After a few seasons, these records become your most valuable guide to how your orchard responds.

Common nutrient deficiencies in cherry

• Nitrogen (N): Pale, light green leaves and weak shoots. Too much is also a problem; let the analysis set the balance.
• Potassium (K): Scorched leaf margins. Closely linked to fruit size and quality.
• Calcium (Ca): Important for fruit firmness and shelf life. Calcium moves into the fruit with the flow of water, so irrigation management also affects calcium nutrition.
• Boron (B): Needed for flowering and fruit set. The gap between deficiency and toxicity is narrow. Applying boron without analysis is risky.
• Zinc (Zn): Small, narrow leaves and rosetting at shoot tips. Common on high-pH soils.
• Iron (Fe): On calcareous soils, young leaves turn yellow between green veins. The issue is usually poor uptake, not a lack of iron in the soil. Suitable chelated iron forms and a lime-tolerant rootstock matter.

From analysis to programme, together

The right doses and timings depend on soil type, climate, variety, rootstock and analysis results. The same report can mean two different programmes for two different orchards. At Adalia Danışmanlık, we plan the sampling with you, interpret the lab results and turn them into a measurable fertiliser programme built for your orchard.