Rootstock Grafting Watermelon Seedling Technology

Core tips

Even crops are susceptible to wilt disease, resulting in reduced yields of watermelons. The most successful and most effective way to solve this problem is to adopt root grafting technology. South Korea longevity, golden partners and other pumpkin rootstock disease resistance, and watermelon have a better "graft affinity" and "symbiotic affinity." The grafted rootstock seedlings exhibited rapid growth at the late stage of colonization, a large number of vines and leaves, and good low temperature elongation and low temperature fruit set.

First, grafting methods and techniques

1. Insert the rootstock 6-8 days ahead of time with a seedling nursery nutrition, and then broadcast watermelon seed, watermelon cotyledon to be started, the first true leaf when the rootstock for grafting appropriate period. Select the appropriate size stock, cut the growing point with a blade, use a bamboo stick inserted from the top of a wedge-shaped hole, the depth of about 1.0 cm, and then take the melon seedlings, in the lower part of the cotyledon 1.5 cm with a blade obliquely cut a wedge-shaped surface, the length is roughly related to the hole The depth of the same, then insert it into the hole in the rootstock, grafting is completed. The method has a fast grafting rate, a high survival rate, and does not require a fixed object interface. However, the grafting technique requires high requirements. The seedling age requirement is strict. The pumpkin rootstock seedlings are unfolded from the first true leaf to fully flatten, and the watermelon seedlings are expanded from the cotyledons to The first true leaf was expanded into a suitable grafting period.

2. By using similar size rootstocks and watermelons, place the upper end of the hypocotyl of the rootstock close to the cotyledons, and use a blade to make a 45-degree downward cutting, which is less than half of the embryonic axis and about 10cm in length. In the corresponding parts of melon seedlings to do a 45-degree oblique cutting knife, deep half of the embryonic axis, the length and rootstock equal; the rootstock and melon seedlings are embedded in both the knife edge, with a plastic mulch, can also be used to clamp the incision clip, Grafting is completed.

The survival rate of grafting depends on the method of grafting, the quality of the rootstock and the skill level of the grafting technique, and also depends on the weather conditions after grafting. The survival rate is good when the daylight is bright, but the shade is needed when the light is strong.

Second, grafted seedlings of temperature, humidity and light requirements

1. Rootstock before the grafting incubation period: Rootstocks are soaked in warm water at 25°C for 10-12 hours (washing and changing the water every 1 hour during infiltration), germination at 28°C-30°C, budding after 36 hours, sowing. Fill the bottom water before sowing, maintain 24°C-25°C after sowing, gradually cool down after emergence, reach 20°C-21°C when grafting, keep enough light, no watering before grafting, proper ventilation, prevent humidity, high temperature .

2. Temperature, humidity, and light requirements during the survival period after grafting: Immediately after grafting, the grafted seedlings should be filled with sufficient water, and they should be quickly and carefully placed in the seedlings with shading and heat retention and moisturizing to enhance management and promote survival.

3.Temperature: immediately after the temperature to 24 °C -25 °C, the first three days of noon more than 26 °C -28 °C at noon, 24 °C -25 °C at night, a week after noon during the day at 23 °C -24 °C, 18 °C at night - 20 °C, ground temperature 22 °C -24 °C, before planting to 15 °C -18 °C before hardening.

4. Humidity: The seedlings were poured in water one day before grafting, and then supplemented with water. After the grafting, the moisture was kept covered with a plastic film and a shed. The first three days are not ventilated, and the relative humidity is 100%. After the animals are alive, they are gradually ventilated and gradually enlarged from the low-light areas on both sides. During the survival period, they can be kept as long as they do not dry.

5. Light: After 3 days, it was completely closed and shading. After 3 days, the light was gradually reduced. After 7 days, it went into normal management.

Third, pay attention to measures

Grafting seedlings live during high temperature and humidity are not visible, powdery mildew may occur, should be sprayed, adventitious buds rootstock grafted shoots, removed at any time, when planting attention to the joints exposed soil surface to prevent scion watermelon rooting, if grafted seedlings Stems admire adventitious roots, also lost the significance of grafting.

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