First, stock selection of rootstock and scion. Rootstocks are used for picking gourds; scion selects good varieties of watermelons that are easy to sell and suitable for local planting. Second, seedlings, preparation before broadcast. Seeds of rootstocks and scions are required to be mature and full, germination rate is above 95%, purity should be above 98%, and the number of grains of scion seeds should be more than 30% more than that of rootstock seeds. The preparation of nutritious soil was: 70% of sandy soil, 29% of fermented soil miscellaneous fertilizer, and 0.1% of compound fertilizer. Rootstock seedbeds are located in greenhouses or greenhouses. The location of the greenhouse or greenhouse: The terrain is flat, dry, sheltered, and sunny. Greenhouse or greenhouse material and structure: bamboo wooden frame, the length of not more than 15 meters, the top height of not less than 1.6 meters, a span of not less than 4 meters, covering 0.1 mm agricultural film. The scion bed uses a plastic shed and chooses a high temperature dry section outside the greenhouse. The nutrition bowl has a diameter of 10-12 cm and a height of 10-12 cm. In addition, one wet and dry thermometer, one watering can and sprayer, two double-sided blades or flat bamboo sticks (approx. 0.2 cm wide, 0.1 cm thick, 10-12 cm long), a thermostat box, and a straw screen Several sheets. 2, germination sowing. The temperature during rooting of the rootstock needs to be stable above 15°C. Seeds are soaked in fresh water for 36-48 hours and then kept at 25-30°C until germination. When sowing seedlings, each seedling should be sown with 1 open-rooted rootstock seed. The seeds should be laid flat. The seed should be covered with thin sand and the water should be moistened in a timely manner. Before grafting, the rootstocks should be ventilated and hardened. When true leaves appear, the top buds are removed. The scion should be sown 8-12 days after sowing of the same batch of rootstock seeds. Seed soaking in fresh water for 4-6 hours, set in a 35°C incubator for 24 hours, then maintain 25-30°C until germination. Fill the bottom water and spread the germinated seeds evenly on the seedbed. Pitch 1.5-2 cm, arch (top 40-50 cm), covered with plastic film. During the grafting period, the cotyledons of the scion were only opened to green. The temperature is above 18°C ​​and the optimum temperature is 25°C. It is not suitable for grafting in rainy or cold weather. The growth point of the rootstock was first removed, and bamboo sticks were inserted obliquely between the two sub-leaves of the rootstock, slightly penetrating 1.5-2 cm deep outside the stem, and were not removed. On the hypocotyls of the scions, 1-1.5 cm below the cotyledon was chamfered toward the root, and the length of the cut surface was 1-1.5 cm. Remove the bamboo stick and immediately insert the cut scion into the rootstock. 3, management. After grafting, the greenhouse should be closed and the indoor relative humidity should be kept above 90%. Keep at room temperature 20-30 °C, the optimum temperature is 25 °C. Covering shading with straw curtains, gradually increasing the time of light exposure after 3-5 days, the shading seedlings can be removed after 10 days. Minimize ventilation after 2-3 days of grafting and change only 1-2 times a day (in the morning or evening). After grafting to survive, it was found that the buds on the rootstock grew out in time and were erased. Before grafting, the root stocks should be sprayed with 58% of Reperosol wettable powder 600-800 times 1-2 times, and grafted and then sprayed again. Third, the field management of grafted seedlings. Grafting seedlings should be graded, and one or two quality seedlings can be transplanted into the field. On the gourd rootstock can reduce the amount of fertilizer by 20-30%. The colonization age should not exceed 35 days and the colonization should not be too deep. The interface should be 5-6 cm from the ground and suitable for sparse planting. Generally 500-600 acres of planting, spacing 2 meters, spacing between 0.55-0.65 meters. Use 3-4 vine pruning, the introduction of vines should not be used when the pressure vines, it is appropriate to use the Ming cited vine, that is, with branches or wire cross-fixed stems, at any time to remove the rootstock buds on the adventitious buds.
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