Variety selection. Select high-yield, high-quality, disease-resistant hybrid generations. At present, there are more Jinyou 33, Jinyou 35, Jinyou 36, and Green Snow.
Nursery and seedbed management. The time for growing cucumbers in the greenhouse in winter and spring is generally from late October to early November. The cucumber must be grafted and the rootstock is usually black pumpkin.
1. Seedbed preparation. Cucumber and black seed pumpkin bed is set in the greenhouse, bed soil can add about 30% of decomposed organic fertilizer and sifted. The bed area is generally 2.5-3 square meters.
2. Soak germination. Before sowing, the seeds shall be soaked in hot water at 55-60°C and continuously agitated until the water temperature drops 25-30°C and soak for 4-6 hours. The black-skin squash should be longer. After the seeds are sufficiently water-absorbed, they are then removed and germinated at 25°C to 30°C.
3. Seeding and seedbed management. Cucumber sowing should be selected sunny morning, cucumber sowing time is about 4 days earlier than the pumpkin, when the temperature is high, the emergence of seedlings is fast and neat. When planting, it should be uniform and the footing water should be poured before sowing. The cover soil should not be too thick nor too thin. When the thickness is too thick, the seeds will be unearthed and the too thin seeds will be easily capped. The thickness of the cover soil of the cucumber is controlled at 1-1.5 cm and the black-skin pumpkin is controlled at 2-2.5 cm. Immediately after sowing, the seedbed was covered with a plastic film to increase the temperature and protect the earthworms, which created a good temperature and humidity condition for the seed germination. After sowing, it is necessary to ensure a higher temperature, generally controlled between 25 °C and 30 °C. The temperature after emergence may be appropriately reduced to prevent the seedlings from being too long. After the seedlings were unearthed, 50% thiophanate-methyl WP was sprayed 4-5 days before grafting, and 500% of the 50% carbendazim WP was sprayed.
Grafting and grafted seedling management. At present, there are many methods used in production to rely on the grafting. This method has a high grafting survival rate and is easy for the masses to master.
Prepare enough nutritious soil before grafting. When the first true leaf of the rootstock is half unfolded, the cucumber seedlings are suitable for the proper grafting period. 1-2 days after grafting is the formation period of callus, which is a critical period for survival. It must be ensured that the humidity in the small arch canopy exceeds 95%, and it should be shady in the first two days. On the third day, we can see the weak light in the morning and at night. After 4-10 days, the light should be gradually strengthened, and the shade should be properly shaded at noon. At the same time ventilation time gradually increased from 1 hour, 7-10 days can be ventilated throughout the day. After 10-15 days, the hypocotyls of cucumber were cut off, and the changes of seedlings should be controlled flexibly, and the light and temperature should be adjusted to improve the survival rate.
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