Sunflower (Helianthus annuus) is one of Ukraine’s leading agricultural crops and plays a key role in the production of vegetable oil, feed, and biofuel. It belongs to the Asteraceae family and has a strong upright stem, large leaves, a branched root system, and a characteristic flower head 15 to 40 cm in diameter. The crop is highly drought-tolerant and adapts well to different soil types and climate conditions, which makes it extremely valuable for farmers in all regions of Ukraine.
Sunflower is able to draw moisture and nutrients from deep soil layers thanks to its taproot, which can reach 2 meters. Because of this, the plant can withstand even long periods of drought. The growing season of modern hybrids averages 90–120 days, so the crop is successfully grown in both northern and southern regions. Sunflower is an extremely flexible crop: there are hybrids adapted to different sowing times that can deliver stable yields when basic cultivation requirements are met.
Ukraine is one of the world leaders in the production and export of sunflower oil. Every year, more than 5 million hectares are sown with this crop, mainly in the steppe and forest-steppe zones. This is explained both by its high profitability and by the presence of a strong processing infrastructure. In addition to its industrial importance, sunflower is also grown on household plots for seed production or decorative purposes. Breeders have developed many varieties and hybrids with different heights, petal colors, and growing periods, making it possible to choose the ideal option for any region of Ukraine.
Note: for small farms, mid-season hybrids resistant to broomrape, marked “OR,” are especially relevant, since they do not require complicated chemical treatment.
For successful sunflower growing, it is important to choose the site correctly. The highest yields are obtained on fertile chernozem soils with neutral acidity, pH 6.0–7.2. Sunflower does not tolerate stagnant moisture or acidic soils: under such conditions, root rots develop, the plant becomes suppressed, and yields drop sharply. The crop performs best on loamy and sandy loam soils with good structure and water-holding capacity. Before sowing, it is worth carrying out an agrochemical analysis to determine the levels of nitrogen, phosphorus, potassium, and sulfur, since these have the greatest influence on yield and seed quality.
Field preparation begins in autumn. Plowing is done to a depth of 25–30 cm with the application of organic matter such as well-rotted manure or compost at 4–6 t/ha. In spring, cultivation, harrowing, and leveling are carried out. Soil compaction must not be allowed, especially in the top layer, because it interferes with root respiration. If a crust forms after rains, pre-sowing rolling should be done. Growing green manure crops such as mustard or oilseed radish in the previous season helps restore soil structure.
Proper crop rotation is the key to preventing diseases, especially broomrape and phomosis. Sunflower must not return to the same field more often than once every 6–8 years. The best preceding crops are cereals such as wheat and barley, silage corn, and legumes. It is undesirable to sow it after rapeseed, soybean, tobacco, or other crops that share pests and pathogens. After sunflower, it is advisable to sow crops with a shallow root system, since this helps restore soil structure.
Tip: in areas with severe broomrape pressure, it is worth using special herbicide-tolerant hybrids and treating the soil before and after sowing according to the instructions.
The optimal sowing time for sunflower is when the soil at a depth of 5–7 cm warms to +8 to +12°C. In southern regions of Ukraine, this may be as early as late March to early April, while in central and northern regions it is usually from mid-April to early May. Late sowing, at the end of May, leads to reduced yields because the plants do not have enough time to develop fully before autumn.
Before sowing, the seed is treated with fungicidal and insecticidal dressings, which is especially important for early sowing dates. The sowing rate depends on the hybrid and the region: for early hybrids, 50–55 thousand plants per hectare; for mid-season ones, 45–50 thousand per hectare. Sowing depth is 5–7 cm, and on heavier soils up to 8 cm. Standard row spacing is 70 cm or 45 cm where denser placement is used.
The sowing pattern depends on the machinery available. Under the traditional system, row-crop seeders with 70 cm spacing are used, making inter-row cultivation possible. Under solid sowing, a more precise seeder is needed, but inter-row care becomes more difficult. After sowing, rolling is recommended because it ensures good seed-to-soil contact and speeds up germination. Seedlings appear in 5–10 days depending on temperature.
Warning: overly dense stands lead to lower oil content, a smaller head size, and a higher risk of fungal diseases.
After emergence, the main task is to create conditions for even sunflower development. The first two weeks after emergence are critical: the plants are weak, easily suppressed by weeds, and do not tolerate moisture shortage well. If the stand is too dense, manual thinning is carried out on small areas, or mechanical thinning on larger ones, leaving no more than 4–5 plants per square meter. After thinning, the first inter-row loosening is advisable, to a depth of 5–7 cm. This improves aeration, reduces moisture loss, and breaks the soil crust.
In most regions of Ukraine, sunflower is grown without irrigation, but in conditions of prolonged drought, especially during budding and grain filling, it is advisable to provide at least 1–2 waterings. The critical stages for moisture are the 6–8 leaf stage, head formation, and seed filling. Under drip irrigation, it is important to avoid overwatering, especially on heavy soils. Morning or evening irrigation is preferred.
Feeding greatly affects both yield and seed quality. At the 4–6 leaf stage, the first top dressing is applied with nitrogen-phosphorus fertilizers, about 50–70 kg/ha of ammonium nitrate plus 40–50 kg of superphosphate. During budding, potassium should be added, such as potassium sulfate or monopotassium phosphate. Sulfur is especially important because it affects oil content. On household plots, complex fertilizers such as NPK 12-24-12 may be used at 20–30 g/m². Excess nitrogen leads to the growth of green mass instead of seed production.
Tip: at the 8–10 leaf stage, foliar feeding with boric acid, 1 g/l, is useful because it improves seed set and increases oil content.
At early growth stages, sunflower is especially sensitive to weeds, which may completely suppress young plants. Effective herbicide treatment is therefore a mandatory part of the technology. In the classic system, herbicides based on acetochlor, trifluralin, or prometryn are used before or immediately after sowing. In Clearfield and ExpressSun systems, the appropriate herbicides are used, effective against a broad range of weeds, including ragweed, sow thistle, and pigweed.
Sunflower pests include wireworms, cutworms, meadow moth, and sunflower moth. For early-stage protection, seed treatment with insecticides such as imidacloprid or thiamethoxam is used, and during vegetation insecticides such as Karate Zeon, Fastac, or Actellic are applied. Special attention should be paid to head-feeding pests because they reduce seed quality and lead to yield loss.
The main diseases are phomosis, phomopsis, white rot, alternaria, and rust. The most effective control method is the use of resistant hybrids together with proper crop rotation. When symptoms of disease appear, fungicides such as Akanto Plus, Thanos, or Amistar Extra are used. Treatments are usually carried out at the 8–10 leaf stage and at the beginning of flowering. It is also important to avoid mechanical damage and overly dense crops, which encourage fungal diseases.
Note: when choosing a hybrid, pay attention to its resistance to major diseases, which is indicated in the producer’s catalog or in the State Register.
Sunflower ripening has several stages: physiological maturity, when seed moisture is 30–40%; commercial maturity, when the seeds are hard and the head is dry; and full maturity, when seed moisture is 8–12%. In most regions of Ukraine, harvesting begins in August and finishes by the end of September. The best moment for harvest is at 10–12% seed moisture, which helps avoid extra drying and losses from shattering.
On large areas, special headers or combine attachments are used, while on small plots universal grain harvesters with adapted cleaning systems are used. After harvest, the seeds are cleaned, dried if necessary, and stored in ventilated facilities. The oil content of modern hybrids ranges from 45 to 52%, and in high-oleic ones up to 60%. With proper technology, yields of 2.0–3.5 t/ha or more can be obtained.
The economic value of sunflower growing is explained by stable demand for oil, meal, and exports. Profitability may reach 100–150% depending on the variety, climate, and cultivation practices. The crop fits well into crop rotation, supports soil health, and its by-products such as cake and husks are used for feed or fuel. For Ukrainian farmers and household growers, sunflower is a reliable, profitable, and strategic crop.
So, sunflower is one of the most profitable and stable crops in Ukraine’s agricultural sector. When cultivation technology is followed properly, it provides high yields, helps preserve soil fertility, and delivers strong economic returns.
