Blueberry fertilizers

How to choose blueberry fertilizers for each feeding stage

Choose blueberry fertilizers with the age of your bushes, soil condition and previous applications in mind. DÜNGER offers two dedicated granular products for this crop: the first-feeding complex and the second/third-feeding complex. Their nutrient compositions and intended seasonal uses differ. Before ordering, identify the task you are planning, whether an early spring application or a subsequent feeding of established bushes.

The word complex in the name does not mean the formulas are interchangeable. The first product supplies nitrogen and sulfur; the second also contains phosphorus, potassium and other components. Equal weights of the two products do not provide the same nutrition. Check the instructions before substituting one for another. Include fertilizer already present in the planting medium or supplied through irrigation in your records. A new month alone is not a reason to add another dose.

Soil acidity and nutrition are related but separate tasks

Blueberries need acidic soil. The guidance supplied with both dedicated DÜNGER complexes gives a pH of 4-5. Check the actual soil acidity and growing conditions before making adjustments: fertilizer does not replace the preparation of unsuitable soil. If the site has several distinct growing areas, one random measurement may not represent all of them. Keep your test results and amendment history so that changes can be assessed over time.

The Ukrainian methodological guide to blueberry cultivation discusses nutrient selection based on soil analysis. Its agronomic calculations are not ready-made doses for any packaged fertilizer. For the products below, use their own application instructions and check the label on the pack you buy.

Two dedicated DÜNGER blueberry complexes

Complex for the first feeding

The first-feeding blueberry complex contains 21% nitrogen N and 24% sulfur S. This granular product is intended for early spring, when buds are swelling. Its instructions cover both new and existing plantings, with the amount chosen according to the age and size of the bush. The available pack sizes are 1 and 5 kg.

The product card states 20-30 g per bush, distributed evenly beneath the plant. This rate belongs to this first-feeding product; it is not a rate for every nitrogen fertilizer in the catalogue. For a small young plant, do not invent a dose simply by halving an assumed adult rate. Consider plant condition, nutrients already supplied in the growing medium and the instructions for the particular package.

Complex for the second and third feedings

The second/third-feeding blueberry complex declares N10-P₂O₅8.5-K₂O11.5-S14, plus MgO1.5 and B0.35. Phosphorus, potassium and magnesium are stated as P₂O₅, K₂O and MgO, matching the product card. These are not identical percentages of the pure elements. This product is also offered in 1 and 5 kg packs.

The written instructions describe subsequent applications in early May and June, starting from 30 g per plant according to age and size. These are the manufacturer's timings for this particular complex, not a universal calendar for every cultivar and growing situation. Do not transfer this rate to the first product or treat both products as a mixture that must be applied together.

Blueberry fertilizer application rates

The table brings together the instructions for the two dedicated products. The quantities refer to grams of finished fertilizer per bush, not grams of pure nitrogen or a concentration per bucket of water. Before measuring, check the product name and the label on your own pack. The distinction is especially useful when both similar-looking packages are stored together.

Both products call for moist but not waterlogged, loosened soil. Weigh the quantity and distribute it evenly. A per-bush rate cannot automatically be turned into a per-square-metre rate: planting distances and bush sizes differ. Containers also require separate consideration of the volume and composition of the growing medium. Do not treat a pot as an equivalent area of open-ground planting.

Calculating how much to buy

For ten bushes suited to the stated first-complex rate, one application requires 200-300 g: multiply ten by 20-30 g. This is an arithmetic example, not advice to select the upper end every time. Group bushes by age and size before calculating. Choose a 1 or 5 kg pack for the quantity you actually need, rather than increasing the rate to use up the remainder.

Feeding blueberries in spring, summer and after harvest

Starting in spring and planning subsequent applications

In spring, match the plant's development stage to the first-complex instructions. Record the date, product and quantity actually applied. Before subsequent feedings, review what the plant has already received. If nutrients are being supplied through irrigation, include them in the total; granular fertilizer is not automatically an additional required dose on top of that programme.

During berry development, increasing the rate simply to obtain sweeter fruit is not a sound reason for another application. If growth is weak, review conditions and previous care first. Select a dedicated fertilizer for its intended purpose, rather than treating it as a guaranteed solution to every growing problem. No foliar-spray rate for these granules is provided here, so do not convert the table into a spray recipe.

Is a separate autumn fertilizer necessary?

Plan autumn blueberry feeding around the condition of the planting and previous applications. Not every bush needs an additional dose. The dedicated products shown here describe spring and subsequent early-summer feedings. Do not move those doses to August or September without a separate assessment. The name universal autumn fertilizer on another product does not, by itself, confirm that its formula and rate suit your blueberries.

Questions about blueberry nutrition

Is ammonium sulfate suitable for blueberries?

Yes, it is used as a nitrogen source for this crop. Blueberries prefer ammonium nitrogen, but saying they cannot absorb any other form is too categorical. The University of Maryland Extension guide explains this distinction. Follow the instructions for the product you purchase, rather than borrowing a rate from a different fertilizer with a similar name.

How should soil be acidified, and can mulch help?

Choose an acidity adjustment using soil and irrigation-water analysis. Sulfur declared as a fertilizer nutrient and elemental sulfur sold for acidification are not interchangeable treatments. Do not assume one citric-acid dose is appropriate for every water source. Bark and other suitable mulches help care for the soil surface, but do not guarantee a particular pH; acidity must be measured.

Why do leaves turn yellow or red?

Leaf colour alone does not establish the cause. Check acidity, moisture, root condition and previous applications. Before asking for advice, prepare photographs of the whole bush and individual leaves, its age and available test results. Do not prescribe boron, magnesium or iron from one symptom or increase every fertilizer at once.

Buy blueberry fertilizers with delivery within Ukraine

Open the dedicated product cards to choose a 1 or 5 kg pack, check the current price and availability, and read the full instructions. Order the products needed for first and subsequent feedings separately. When choosing nutrients for several kinds of planting, also browse fertilizers for garden plants and the complete DÜNGER catalogue.

The selection also displays universal granules and DÜNGER VIVO as additional products for other garden and vegetable crops. They are not included in the blueberry feeding guidance above. The All products tab contains the full range. Place your order under the store's current delivery and payment terms. For help choosing, have the number and age of bushes, growing conditions and previous feeding records ready.