In order to solve the problem of watermelon cultivars, it effectively prevents the occurrence of the wilt disease, enhances the stress resistance of the grafted seedlings and the capacity of absorbing fertilizer, and effectively improves the yield, quality and efficiency of the watermelon. The use of grafting technology to turn good seedlings off is the key to capturing the high yield, quality and efficiency of seedless watermelons. The main points of sowing techniques are as follows:
Immersion seed germination Seeds of rootstock are kept in warm water of 55°C~60°C for 15~20 minutes, then the water temperature is maintained at 25°C~30°C, soaking seeds for 18~24 hours, removing the artificial shell, and germinating under 30°C~33°C conditions. Watermelon seeds can be soaked in the same way 5 to 7 days after sowing of rootstock seeds.
Seeding When the seeds of germination exceed 70%, the seeds can be sowed. Before planting, the bottom water should be poured. Take 1/3 of the Wufu Mixture and spread the soil evenly in the seedbed. The rootstock seeds will be sown in the nutrient bowl. 2 tablets, and then cover the seeds with the remaining 2/3 drug earth. Watermelon seed that has been promoted can be sown 7 to 10 days after the rootstock seed is sowed or when the rootstock seed is unearthed. After pouring enough water into the rootstock, the seed can be evenly sowed, so that 1000 to 1500 seeds are sowed for each time, and then the soil is covered. General watermelon seedlings begin to graft about 5 days after emergence.
Grafting mostly uses the top plugging method, and the watermelon leaves are "Y" shaped to the flattening period as the appropriate grafting period. When grafting, the true roots and growth points of the rootstock are first trimmed with a blade (can be removed 2~3 days before grafting to promote the thickening of the hypocotyl, which is conducive to improving the grafting survival rate and the convenience of operation), and then the bamboo shoots are connected with the cotyledons. Insert the hypocotyls of the rootstock obliquely downward, about 0.5~1cm deep. (Note: The tip of the bamboo stick reaches the other side of the hypocotyls of the cotyledon, and it is appropriate for the top of the finger to have a sense of touch). Take out the scion and use a blade to cut it 1~1.5cm below the cotyledon to make it wedge-shaped. Then quickly pull out the bamboo stick in the rootstock and accurately insert the scion into the direction of the bamboo stick and insert it obliquely into the hole of the rootstock. After cocooning, the cotyledons of the scions intersect with the cotyledons of the rootstock to form a cross.
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