Currently, watermelon grafting technology has been widely used in production.
First, choose the proper rootstock material. The rootstock materials that can be used as a grafted watermelon include pumpkin, gourd gourd, gourd, wild watermelon and winter melon. Wild watermelon, gourd and melon gourd have strong affinity with watermelon, and they survive after grafting. The quality of watermelon grafted with gourd and gourd is also good, but the resistance of watermelon is not too high; the resistance of watermelon grafted with watermelon is good. The strongest, but the affinity of pumpkin and watermelon varies greatly due to variety, so the survival rate of grafting is not stable.
Second, grafted seedling growth facilities are prepared. In winter and spring seasons, there must be a well-maintained greenhouse or greenhouse.
Third, the production of nutritional ingredients. The organic fertilizer in the paddy field or wheat field surface soil (without melons) was thoroughly sieved and well-composed organic fertilizer was mixed in a ratio of 2:1. Press 0.25 kg urea per ton, 1 kg superphosphate, 0.5 kg potassium sulfate, 0.25 kg 40% carbendazim bromide WP and 25 kg of water, mix and sprinkle into the soil and mix well. . Cover with a plastic film stack for 2-3 days, unfold the film and place it into the chamber.
Fourth, sowing. Rootstock seeds need to be soaked in warm water of 55°C for 15 minutes before sowing, and then soaked in normal temperature water for 24-36 hours. After being removed, they should be soaked in wet cloth at a temperature of 25-30°C for 24 to 48 hours until more than 70% of seeds are sown. When exposed, each seed sowing depth of 1 cm sowing, and pouring enough water into the shed, during the day 28 °C, 18 °C at night, until the seedlings arch out of the soil surface, the temperature dropped to around 25 °C during the day, 15 °C at night about. When the splicing method or plugging is used, the rootstocks are planted about 7 days in advance, and the method of docking is to sow the watermelons to sow about 7 days in advance.
Fifth, grafting. Grafting can be accomplished by docking, splicing, or plugging.
Sixth, grafted seedling management. It usually takes 10-12 days from the grafting to survive, especially the environmental conditions in the first 5 days after grafting, which are crucial for the healing of grafted grafts and the growth of grafted seedlings. 2 days after grafting, the temperature is required to be 25-28°C during the day and 24-25°C during the night. The seedlings should be shaded and tempered, closed and moistened, and should not be ventilated. After 3-6 days of grafting, 22-28°C during the day and 18-20°C at night. 1 week before planting, keep the temperature at 22-25°C during the day and not less than 12°C. The ground temperature should not be lower than 20°C. 1-2 days before grafting should be fully watered, so that the humidity within the shed is saturated (in order to hang water droplets on the leaves), 3-4 days after grafting into the wound healing period, then gradually reduce the humidity. It can be gradually ventilated and humidified when the humidity is high in the early morning and early evening. 10-12 days after the general seedbed management. No air ventilation is required for 1-2 days after grafting, with slight ventilation from the third day.
Seventh, grafted seedlings are planted. Grafting seedlings from sowing to planting for 30-35 days. The standard for grafted seedlings is three-leaf or four-leaf. When planting, the grafting interface should be 1.5-2.0 cm above the ground.
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