From late October to early November, it is a crucial period for the management of wintering squash and zucchini seedlings. The focus of management is to prevent seedlings from becoming leggy and cultivate strong seedlings. Because the courgette zucchini is cultivated in a solar greenhouse, the outside temperature is still relatively high, and the temperature in the greenhouse is often affected by the external temperature. If the seed bed humidity is relatively high, the seedlings are prone to leggy. Therefore, the seedbed temperature must be adjusted in time to enhance the management of fertilizers and water to prevent leggy seedlings.
Temperature regulation should be gradually lowered after the cotyledon is unfolded in seedlings. The temperature is maintained at 20°C-25°C during the day and 10°C-15°C during the night. During the daytime, if the temperature exceeds 25°C, the air should be released. In the morning, the room temperature should not be lower than 8°C.
From the first full-blown true leaf to 7-10 days before colonization, the indoor temperature should be appropriately increased. The daytime temperature is controlled at 22°C-28°C to accelerate seedling growth.
In the 7-10 days before planting, low-temperature seedlings should be cultivated. The daytime temperature should be controlled between 18°C ​​and 22°C and 8°C-13°C during the night. This will not only improve seedling resistance, but also prevent seedlings from growing too long, and at the same time promote Female flower differentiation, lay the foundation for high yield.
Fertilizer management In order to prevent the seedlings from becoming leggy, they must strictly control the moisture during the seedling raising. When there is no drought, they should not be watered. If the bed soil is dry and it really needs watering, spray water in the morning and avoid flooding. When the first true leaf is unfolded, it can be combined with water spray for foliar dressing. When the seedlings show signs of leggy, they can be sprayed 200 times with potassium dihydrogen phosphate or auxin, which inhibits their appetite and promotes robust seedling growth. After the seedlings grow to 3 leaves or 4 leaves, the seedlings can be planted when they are 10-12 cm high. The seedling age is generally 30-40 days.
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