The survival rate of grafted seedlings depends on the quality of management after grafting. It generally takes 10 to 12 days from grafting to survive. During this period, the main links of heat preservation, moisturizing, and shading should be well grasped.
1. Insulation: The suitable temperature for healing of grafted seedlings is 25°C to 30°C during the day and 18°C ​​to 20°C at night. Over 40°C or below 10°C will affect the survival rate. Sunny days cover high temperatures and cover heat at night. After 5 to 7 days, daytime temperatures are maintained at 30°C to 32°C, nighttime temperatures are above 15°C, and ground temperature is 20°C. After 7 to 12 days, 28°C to 30°C during the day, 13°C at night, and 18°C.
2. Moisturizing: Minimizing Scion Water evaporation is the key to improving graft survival. The air humidity in the seedbed is small, and the scions are prone to dehydration and wilting, and severely affect survival. In order to ensure the humidity, the seedbed should be irrigated when planting, and the small arch shed on the seedbed should be sealed tightly so that the humidity within the shed can be saturated for 3 to 7 days to maintain the humidity from 85% to 90%, and after 8 days, it can be maintained at 80% to 85%. About 10 days later, the grafted seedlings grow new leaves to survive.
3. Shading: Covering the shade with a cover for 3 days after grafting to prevent direct sunlight and a small amount of scattered light. If all shading, yellow seedlings will appear yellow phenomenon, affecting the survival rate 3 days after the early and late can be removed to cover the negative, after the seedlings gradually increased transparency, extended light transmission time, no longer shading 7 days later.
4. Ventilation and ventilation: Within three days after grafting, the membrane can be opened for 1 or 2 breaths a day. After 5 days, the new leaves of the grafted seedlings begin to grow. The amount of ventilation should be gradually increased. The ventilation openings should be small to large, and the ventilation time should be short to long.
5. Removal of sprouts of rootstock: After the growth point of rootstock is removed, lateral buds still germinate one after another. These lateral buds grow rapidly and often compete with the scion for nutrients, affect the survival of grafted seedlings, and must be removed in time. At the same time, attention should be paid to the operation to avoid damaging the cotyledons and loosening the scions.
6. Broken roots: After grafting 10 to 12 days after grafting, the hypocotyls of the scions can be cut from 0.5 to 1 cm below the interface, and two scalpels are removed to remove the hypocotyls of the scions. When the roots are cut off, 2 or 3 strains can be tested first. If wilting does not occur, the root can be completely removed the next day. After the root break, in case of high temperatures in sunny weather, shade and water spray should be properly applied.
7. Withdrawal of the binder: When the grafted seedlings pass through the slow seedling stage, the scion grows new leaves, which proves that the grafted seedlings have survived. After 10 days, grafting clips should be promptly removed. If the interface does not grow well, the grafting clips can be gradually removed after colonization. In order to avoid affecting the growth and development of grafted seedlings.
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