High survival rate of watermelon grafted by new method

At present, there are many methods for grafting watermelon, but the survival rate is not very satisfactory, and the melon seedlings have different strengths and weaknesses. In recent years, our department has explored new methods of docking and docking, not only the operation is very simple, but grafted seedlings are healing quickly and grow well, and the yield of watermelons is high. 1, plug in method. When grafting, the first true leaves of the rootstocks are well developed. The rootstocks can be grafted 6-8 days after seedling emergence, and the grafting time can be maintained for 8-10 days. The lower cotyledon hypocotyls will be hollowed out later, which will affect the survival rate. The scion of watermelon is just suitable for cotyledons. Prepare a bamboo stick before grafting, the thickness of which is equal to or slightly thicker than the watermelon seedling, and the front end is cut into a wedge surface. When grafting, first remove the growing point of the rootstock seedlings, then insert the depth of about 1cm from the growth point obliquely downwards and the direction parallel to the cotyledon with the tip of the tip of the bamboo stick, so that the tip of the bamboo stick barely exposes the rootstock. Then take the scion with a blade and cut it into a wedge surface 1 cm below the cotyledon, about 1 cm long, pull out the bamboo stick, insert the scion incision into the hole, and the tip slightly exposes the rootstock. It should be noted that the scion cannot be inserted into the stem hollow. 2, by the method. Pull out the scion from the seedling plate and incise the incision 1 cm from the top to the bottom of the seedling leaves 1 cm below the seedling. The depth of the incision reaches 95 of the diameter of the embryonic axis of the rootstock, and the scion is 2 cm from the top of the cotyledon. Diagonal incision about 1 cm long, and then the two tongue-shaped fitting, with plastic tape or tied with a graft clip can be, and then dig a small hole in the root stocking nutrient, the scion buried in soil watering . Grafting cultivation of watermelon can use gourd as rootstock, when using the grafting method, rootstock and scion are sown at the same time. If using the plugging method, the gourd should be sowed about 5 days in advance. 3, seedbed management. After grafting, the seedbed must be strengthened from the following aspects in order to achieve the best survival rate: First, heat, the suitable temperature for grafted seedling healing is 20-28°C, and the seedbed temperature must be checked frequently to keep the scoop during the day: the temperature is not high At 28°C, no less than 20°C at night; the second is moisturizing, and the grafted seedlings do not receive the water absorbed by the roots of the rootstock before healing, and the scions are easily wilted. Therefore, within 3 days after grafting, 100% relative humidity of air should be maintained, that is, after the ground is thoroughly irrigated, the surface of the membrane should be kept in water droplets. The air can be gradually ventilated after 3 days. The air is released 1-2 times a day, in the morning and in the evening, after 1 week. A small amount of shed film is opened, and the air is cooled; Third, shading, shading must be strictly followed within 2 days after grafting, and the light can be blocked after 2 days, and light is gradually seen. After 1 week, shading is not required. Fourth, water must be controlled, and watermelon should be wet and dry. In general, no water is used for top dressing, and if the seedbed is too dry, small water can be poured at noon in sunny days. When fertilizer is lacking, 0.3% of urea or potassium dihydrogen phosphate is sprayed on the leaves. In addition, timely removal of rootstock buds. China Agricultural Network Editor

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