How to improve the survival rate of overwintering cucumbers grafted

Grafting cucumber seedlings with black seed pumpkin as rootstock is a commonly used technique for cucumber cultivation in overwintering, which not only improves the disease resistance of cucumber, but also improves the ability of root absorption and cold resistance. So how to improve the survival rate of overwintering cucumber grafting has become the key technology in production can not be ignored. Whether or not cucumber can survive after grafting is affected by many factors. The following aspects are brought to the attention of farmers.

1. Choosing rootstock with strong grafting affinity to cucumber. The black-skinned squash used in production has a strong affinity with cucumbers. Note that rootstocks and cucumbers are properly sown in the wrong period. Generally, cucumbers are planted 5 days earlier than black-seeded squash.

2. Choose the grafting technique you are skilled in mastering. The cuttings of the rootstock and scion should have a certain depth and be properly engaged. Grafting mostly uses the docking method, but also the plugging method. The cucumber seedlings are 7 to 10 cm in height, and the length of the heart is 1 to 1.5 cm. The cotyledons of the pumpkin are flattened. The leaves of the heart are just revealed to be suitable for grafting by grafting. Grafting should be carried out in the greenhouse, the temperature should be maintained at 25 °C ~ 28 °C, the relative humidity of the air is above 95%. When the temperature inside the facility is high, it can cover the grasshopper shade and cool down.

3. During the grafting process, care should be taken to clean the blade so as not to cause incision infection.

4. Do not injure melon seedlings during operation, so as not to cause necrosis of melon seedlings.

5. The suitable environmental conditions for grafting and healing are mainly temperature and humidity. The growth temperature and relative humidity of grafted seedlings are the key to the survival of grafted seedlings. The shed film should be tightly covered to facilitate heat preservation and moisturization. After the grafting, it was maintained at 25°C to 30°C during the day and 18°C ​​to 20°C at night. After 3 days, it was reduced to 25°C to 27°C during the day and 14°C to 16°C at night. After the root cut, it increased to 28°C-32°C during the day and 8°C-16°C during the night. It was maintained for 3 to 5 days before planting, maintained at 20°C to 23°C during the day and dropped to 10°C to 12°C at night.

After the grafted seedlings are planted, they are not ventilated and the air humidity reaches 100%. When the seedbed is not ventilated and the daytime temperature is too high, the grass can be covered with grass and shrubs to cool the shade. After 3 days of ventilation, the relative humidity of the air was reduced to 70% to 80%. After that, the seedbed temperature was gradually reduced and the seedlings were trained. Ventilation from small to large, so that seedlings have a process of adaptation.

6. Timely rooting. The grafted seedlings must be cut off after the wound has completely healed.

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