Best self-pollinating cucumber hybrids for greenhouses and open soil

Selection of Self-Pollinating Cucumber Hybrids

The correct choice of cucumber hybrid determines the economics of greenhouse and open-field farming. For a stable product pipeline, an agronomist needs self-pollinating hybrids with high marketability, stress resistance, and predictable maturity dates. Presented below are proven hybrids with various fruiting types — from slicing to pickling gherkins.

Stella. An early-maturing hybrid with a female flowering type, leading in harvest maturity among short-fruited cucumbers. The plant forms a cylindrical fruit 22—25 cm long. The fruit surface is characterized by a weakly ribbed structure.

Korolek. An early self-pollinating hybrid, where fruiting begins 47—53 days after mass emergence. The fruit is green, cylindrical, with a smooth base and a matte, sparsely tuberculate surface. The plant possesses complex resistance to powdery mildew and downy mildew, and also demonstrates high tolerance to brown spot and Ascochyta blight.

Aprelsky. An early and high-yielding self-pollinating hybrid. Its fruits are noted for their high taste qualities. Cucumbers of this hybrid are for slicing, but they can also be used for canning.

Prestige. A newest self-pollinating early-maturing hybrid with outstanding yield. With proper agrotechnics, more than 20 kg of superb quality gherkins can be obtained from 1 m² of plantings. The fruits have no bitterness and retain their elegant market appearance for a long time. The hybrid is distinguished by a long fruiting period, resistance to diseases, and stress-inducing growing conditions. It provides stable harvests under plastic, glass, in open ground, as well as on a windowsill or balcony, and is excellent for canning.

Patty. A newest self-pollinating early hybrid with small tubercles, providing consistently high yields. Due to the predominantly female flowering type, it forms a large number of fruits without bitterness and with small seed cavities. The hybrid is distinguished by high pickling qualities: the cucumbers are crunchy, do not form voids during canning, and store for a long time without property deterioration. The plant is resistant to diseases and environmental stress factors.

Kristina. A self-pollinating early hybrid with small tubercles. It is characterized by a predominantly female flowering type, which ensures the formation of a large number of cucumbers. The fruits are devoid of bitterness, have small seed cavities, and possess high pickling properties. The hybrid is resistant to diseases and stress conditions.

Prevention of Viral Mosaics and Fusarium Wilt

• Cucumber rotation period — 3—4 years
• Optimal soil temperature — from 20 to 30 °С
• Soil temperature for root rot development — no higher than 16—18 °С

Reduced cucumber yield is often caused by about a dozen and a half different diseases. The most common are viral mosaics — common, white, and green. Aphids transmit viruses to cucumbers while feeding on plant sap. Natural reservoirs of infection include weeds (perennial sow thistle) and ornamental crops (dahlias, gladioli, cannas, phlox, zinnias). The disease manifests as mosaic leaf coloration, wilting of vines, growth retardation, and fruit set drop.

To prevent the spread of viral mosaic, the agronomist must observe a set of protective measures. They are aimed at spatial isolation of plantings and the elimination of virus vectors. In practice, to reduce disease incidence, it is recommended to perform the following actions:

• Keep cucumber sowings away from ornamental and fruit plants.
• Conduct systematic weeding on the plot.
• Eliminate aphids using treatments with infusions of garlic, onion, celandine, or tomato leaves.

No less dangerous is Fusarium, which manifests as root rot or Fusarium wilt. Root rot more often affects plants in areas with an excess of organic matter — plant residues and waste compost. Before the start of flowering, diseased bushes do not differ externally from healthy ones, but in the fruiting phase, mass wilting of vines begins. With Fusarium wilt, the fungus affects the cucumber's vascular system from the moment of emergence. The first symptom of the disease is the drooping of vine tips, which may initially recover turgor at night but then inevitably die.

The source of infection includes soil, seed, irrigation water, and plant residues. To combat Fusarium diseases, it is necessary to implement a set of preventive measures. In practice, the agronomist should strictly observe the following technological rules:

1. Disinfect soil at all stages of cultivation — sanitize the soil mixture for transplants, freeze the soil used for top-dressing plants, and treat the main plot.
2. Follow crop rotation and do not return cucumbers to the same growing site until at least 3–4 years have passed.
3. Monitor soil temperature, keeping it between 20 °С and 30 °С, and prevent waterlogging of the plot during cold spells.
4. Use water for irrigation that is at the same temperature as the cucumber leaves.
5. Apply small doses of fertilizer in top dressing to avoid increasing the concentration of the soil solution and reducing leaf activity.
6. Hill up the plant stems to prevent water stagnation at their base and reduce humidity in the root zone.

Tomato growth types: a balance of earliness and yield

The choice of tomatoes based on their growth habit determines the care technology and planned dates for harvesting. There is a direct correlation: the earlier a cultivar is, the lower its overall yield, the smaller the fruit, and the less pronounced its taste. For a continuous supply, agronomists are advised to combine 2–3 early-maturing cultivars for the early market with productive indeterminate hybrids for the main harvest on the same plot.

Super-determinate forms are the earliest maturing tomatoes, requiring minimal care. Their first inflorescence is set above the 5th–6th leaf, and a total of 2–3 inflorescences are formed on the bush, after which growth terminates. These plants yield the bulk of the harvest within the first 20 days from the start of ripening. This group includes low-growing cultivars: Nevsky 7, Moskvich, Otradny, Barnaulsky Konservny, Subarktika, and Pixie.

Determinate forms are characterized by limited growth and yield up to 50% of the harvest during the first 20 days of fruiting. Their first inflorescence is set above the 6th–7th leaf, with subsequent ones located every 1–2 leaves. Growth terminates after the formation of 4–5 inflorescences by a terminal bud, after which the plant dies back and the fruit ripens. This group includes early and mid-early cultivars: Sibirsky Skorospely, Talalikhin, Bely Naliv, Novinka Altaya, and Peramoga.

Indeterminate forms have unlimited growth and continue their growing season as long as temperatures allow. The first inflorescence is set above the 9th–10th leaf, and subsequent ones appear every 3 leaves. These are the most productive late-maturing cultivars with large, high-quality fruit: Dragotsennost, Carlson, De-Barao, Kardinal, and Rozovy Gigant. Semi-determinate (intermediate) forms hold a middle position — these are mid-late cultivars whose growth also terminates with a leaf.

Biological characteristics and classification of fruits

• Daily requirement for vitamin C — 125–150 g of fresh fruit
• Daily requirement for vitamin A — 108–240 g of fresh fruit

The tomato, like the potato and sweet pepper, belongs to the nightshade family. It is a plant with an erect or trailing stem ranging from 25 cm to 3–5 m in height. The stem is covered in easily broken hairs that release a dark green substance with a specific odor. The leaves are odd-pinnate, their surface varying from almost smooth to heavily wrinkled, and the small yellow flowers are gathered in an inflorescence — a cyme or cluster.

The crop is highly valued for its taste and high content of vitamins, mineral salts, and acids. A single medium-sized fruit is sufficient to cover the daily nutritional requirements of an adult.

The shape, color, and consistency of the fruits vary greatly depending on the cultivar. The color of mature tomatoes ranges from light orange to dark red, with pink, yellow, white, and purple varieties occurring less frequently. The fruit surface can be smooth or slightly, moderately, or heavily ribbed.

The homeland of the tomato is South America (Chile, Peru, Ecuador). In Europe, the first descriptions of the crop appeared in the 16th century thanks to an Italian botanist who described yellow and red forms and provided the name of the plant (translated as "orange apple"), which is phonetically similar to the Russian word "pomidor." For a long time in Spain, Portugal, Italy, Holland, England, and Russia, tomatoes were grown as ornamental or greenhouse plants.

In Russia, tomatoes were introduced as a field crop in the 1780s. Their widespread adoption was facilitated by a domestic agronomist who developed an original method of cultivation via transplants. Tomatoes gained mass recognition as a valuable commercial crop for greenhouses and open ground only after the First World War.

1. In mid-March, seeds are sown in flower pots in a warm room.
2. When the seedlings reach a height of one vershok (approx. 4.4 cm), they are transplanted into individual pots.
3. After the danger of spring frosts has passed, the transplants are planted in open ground or a greenhouse.

Tomatoes require maximum light exposure, protection from precipitation, and deep, humus-rich soil. Root system of the plants penetrates deep into the soil, so the soil must be moderately moist, but without water stagnation. The taste of the fruit depends directly on growing conditions: a lack of light and heat, or an excess of moisture and nitrogen fertilizer, noticeably degrades the quality of the harvest.

• Temperature for the onset of seed germination — 16–18 °С
• Temperature for uniform emergence — 25 °С
• Optimal soil moisture — 60–70%
• Optimal air humidity — 45–60%

Tomatoes are self-pollinating plants, however, for successful fruit set, the temperature regime is critically important. The taste of the fruit is determined by the ratio of sugars to acids: the more sugars and fewer acids, the tastier they are. Since acids are concentrated in the juice of seed chambers, fleshy fruits with a small number of seeds are considered the tastiest.

Technology of pre-sowing seed treatment

Proper pre-sowing treatment protects the crop from viral diseases, provides the seed with nutrients at the start, and guarantees uniform emergence. The preparation process consists of sequential disinfection, soaking in a nutrient solution, and hardening.

1. Disinfection. Place the seeds in a cloth bag and immerse them for 15–20 minutes in a dark cherry-colored solution of potassium permanganate. After this, rinse them thoroughly with water. Properly treated seeds should turn brown.
2. Soaking. Keep the seeds in the bag for 12 hours in one of the nutrient solutions of your choice:
   • 1 tablespoon of wood ash per 1 liter of water;
   • 1 level teaspoon of nitrophoska per 1 liter of water;
   • 1 tablespoon of "Ideal" liquid fertilizer per 1 liter of water.
   After this, without rinsing the seeds, transfer them to clean water for another 12 hours. To maintain a constant temperature of the solutions and water at 24–25 °С, place the container on a heating radiator, placing a wooden board underneath.
3. Hardening. Place the moist seed bags in the refrigerator on the middle shelf, where the temperature is maintained at 1–2 °С, for 1–2 days. Periodically spray the bags with clean water so that the fabric does not dry out. Immediately after cooling, sow the seeds in the soil.