　　 1. When the plugging method is grafted, the first true leaf development period of the rootstock is better, and the rootstock can be grafted 6 to 8 days after emergence , the grafting time can be maintained for 8 to 10 days, and the hypocotyls of the late cotyledon are hollowed out, affecting Survival rate. The watermelon scion is suitable for the cotyledon to be unfolded. When grafting, the growth point of the rootstock seedlings is first removed, and then the tip end of the bamboo stick is inserted in a direction parallel to the cotyledons from the growth point to the depth of about 1 cm, so that the tip of the bamboo stick just exposes the rootstock. Then, the scion was cut into a wedge-shaped surface 1 cm below the cotyledon with a blade , and the length was about 1 cm. The bamboo stick was pulled out, and the scion was inserted into the hole, and the tip slightly exposed the rootstock. It should be noted that the scion cannot be inserted into the hollow of the stem.
　　 2. Pull the scion out of the seedling tray by the docking method , and cut the 1 cm incision from top to bottom with a blade 1 cm below the rootstock seedling leaves. The depth of the incision is 95% of the root diameter of the rootstock , and the scion is 2 cm below the cotyledon. Cut the incision about 1 cm long from top to bottom , then insert the tongue into the shape, tie it with a plastic strip or clip it with a grafting clip, then dig a small pit in the nutrient bowl of the rootstock and put the scion Buried in the soil.
　　 3. The seedbed after the grafting of the seedbed management must be strengthened from the following aspects to achieve the best survival rate: one must be insulated, the suitable temperature for grafting seedling healing is 20-28 °C, and the temperature of the seedbed must be checked frequently to keep the daytime at noon: The temperature is not higher than 28 °C, not less than 20 °C at night ; the second is moisturizing, the grafted seedlings can not get the water absorbed by the roots of the rootstock before the healing, and the scion is easily wilted. Thus after grafting 3 days to maintain 100% relative humidity, after that is ground irrigated, holding the membrane surface drops, 3 days to gradually vent, leaked 1 day - 2 times, in the early morning and evening, after 1 week may be open a small amount of films, leaked cooling; third, shading, shading after grafting to strictly 2 days, 2 days after the glare shield, and gradually see the light, one week before without shading; four to control water, watermelon hi dry not wet, nursery no watering period is generally not dressing, if seedbed too dry, small water can be poured on a sunny day at noon, when the lack of fertilizer spraying 0. 3 % urea or potassium dihydrogen phosphate. In addition, the rootstock buds should be removed in time.
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