The survival rate of grafted seedlings depends on the quality of grafting management. It takes 10 to 12 days from grafting to survival. During this period, we must grasp the main links of heat preservation, moisturizing and shading.
1. Insulation: The suitable temperature for grafting seedling healing is 25 °C ~ 30 °C during the day and 18 °C ~ 20 °C during the night. The survival rate is affected by more than 40 °C or less than 10 °C. On sunny days, the shade is protected from high temperature and covered at night. After 5 to 7 days, the daytime temperature is maintained at 30 °C to 32 °C, at night at 15 °C, and at a ground temperature of 20 °C. After 7 to 12 days, the daytime is 28 ° C to 30 ° C, the night is 13 ° C, and the ground temperature is 18 ° C.
2. Moisturizing: Minimizing the evaporation of scion moisture is the key to improving graft survival. The air humidity in the seedbed is small, and the scion is prone to water loss and wilting, which seriously affects survival. In order to ensure the humidity, the seedbed should be permeable to water when planting, and the small arch shed on the seedbed should be sealed tightly, so that the humidity in the shed reaches saturation state and the humidity is maintained at 85% to 90% for 3 to 7 days, and 80% to 85% after 7 days. About 10 days later, the grafted seedlings grew new leaves to survive.
3. Shading: Cover the shade with a covering within 3 days after grafting, avoid direct sunlight, and emit light with a small amount of scattered light. If all the shading, the seedlings will appear yellowing phenomenon, affecting the survival rate after 3 days, the shame can be removed early and late, and then the seedlings will gradually increase the transparency and extend the light transmission time, and no longer shame after 7 days.
4. Ventilation and ventilation: within 3 days of grafting, the membrane can be unsealed for 1 or 2 times a day. After 5 days, the new leaves of the grafted seedlings begin to grow. The ventilation should be gradually increased. The ventilation opening is from small to large, and the ventilation time is from short to long.
5. Removal of rootstock germination: After the rootstock is removed from the growth point, there are still lateral buds germination. These lateral buds grow rapidly, often compete with the scion for nutrients, affecting the grafting of agricultural knowledge and survival, and should be removed in time; at the same time, pay attention to the operation to avoid damage to the cotyledons and loosening Scion.
6. Broken root: 10 to 12 days after grafting, the hypocotyls of the scion can be cut from 0.5 to 1 cm below the interface, and the hypocotyls of the scion are removed by two knives. When the root is broken, you can try 2 to 3 strains first. If the wilting does not occur, the roots can be completely broken the next day. If it is hot and sunny after the root is broken, it should be properly shaded and sprayed.
7. Withdrawal of grafts: When the grafted seedlings pass the slow seedling period, the new leaves are grown in the scion, which proves that the grafted seedlings have survived. After 10 days, the grafting clip should be removed in time. If the interface is not well grown, the grafting clip can be removed gradually after planting. So as not to affect the growth and development of grafted seedlings
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