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Muskmelon Grafting Tube
The survival of grafted seedlings largely depends on the care provided after the grafting process. Typically, it takes about 10 to 12 days for the grafted plants to establish themselves. During this critical period, proper attention must be given to temperature control, moisture levels, and light conditions to ensure successful healing.
First, maintaining the right temperature is essential. The ideal daytime temperature for healing is between 25°C and 30°C, while nighttime temperatures should range from 18°C to 20°C. Temperatures above 40°C or below 10°C can significantly reduce survival rates. On sunny days, it's important to cover the plants to prevent overheating, and at night, additional insulation may be needed. After 5 to 7 days, the daytime temperature can be slightly increased to 30°C–32°C, with nighttime temperatures above 15°C and a ground temperature of around 20°C. By day 7 to 12, the optimal temperature range shifts to 28°C–30°C during the day and 13°C at night, with a ground temperature of 18°C.
Moisture management is equally crucial. Minimizing water loss from the scion is key to improving survival. If the air humidity in the seedbed is too low, the scions can become dehydrated and wilt, which severely affects their chances of survival. To maintain high humidity, the seedbed should be watered thoroughly before grafting, and the small arch-shaped cover should be tightly sealed. This helps keep the humidity at 85%–90% for the first 3 to 7 days. After that, it can be gradually reduced to 80%–85%. Around day 10, if new leaves start to appear, it’s a good sign that the graft has taken.
Shading is also an important factor. For the first 3 days after grafting, the plants should be covered to protect them from direct sunlight. Too much shade, however, can cause the seedlings to turn yellow. After 3 days, the cover can be partially removed, allowing some light to reach the plants. Over time, the exposure to light should be increased gradually, and by day 7, shading can be completely removed.
Ventilation is necessary to avoid excessive humidity and promote healthy growth. In the first three days, the cover should be opened for 1–2 short periods each day. As the seedlings begin to grow new leaves after 5 days, ventilation should be increased gradually. Start with small openings and increase the size over time, while also extending the duration of each ventilation session.
Removing sprouts from the rootstock is another critical step. Even after removing the main growth point, lateral buds may still emerge. These can compete with the scion for nutrients, so they must be removed promptly. Care should be taken during this process to avoid damaging the cotyledons or loosening the graft union.
After 10 to 12 days, the scion’s hypocotyls can be cut just below the grafting interface, typically 0.5 to 1 cm from the junction. It’s recommended to test cutting 2–3 plants first to check for wilting. If no signs of stress are observed, the rest can be cut the next day. After cutting, extra care should be taken in hot weather—shade and misting can help prevent shock.
Finally, when the grafted seedlings show signs of new leaf growth, it indicates they have survived. At this point, the grafting clips should be removed within 10 days. If the graft union hasn’t fully healed, the clips can be removed gradually. This ensures the plant continues to grow without restriction. Proper timing and careful handling are essential to maximize the success rate of grafting.