When is watermelon grafted? With what method survival rate is high?

Grafting is one of the methods of artificial propagation of plants, which has the functions of early fruiting, drought resistance, cold resistance and so on. Let's take watermelon as an example to find out when watermelon will be grafted. With what method the survival rate is high?

When will the watermelon be grafted?

1. Grafting watermelon by insertion method is best carried out during the opening period of the first true leaf, and the grafting time can be maintained for 8-10 days.

two。 Others should be carried out in spring and autumn, and attention should be paid to heat preservation, moisturizing and shading when grafting, so that the survival rate can be guaranteed.

What method does watermelon use to graft high survival rate?

1. Plug-in method

When grafting, the opening period of the first true leaf of the rootstock is the best, the grafting time is 6-8 days after the emergence of the rootstock, and the grafting time can last 8-10 days. It is appropriate that the cotyledon just unfolds in the scion of watermelon. Prepare a bamboo stick before grafting, which is as thick as or slightly thick as watermelon seedlings, and the front end is cut into a wedge-shaped surface. When grafting, the growing point of the rootstock seedling is removed, and then the tip of the bamboo stick is obliquely inserted down about 1 cm from the growing point in the direction parallel to the cotyledons, so that the tip of the bamboo stick just exposed the rootstock. Then take the scion and cut it into a wedge-shaped 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. Timely spraying of new high-fat film at the scion mouth can prevent oxidation, prevent bacteria from invading and improve the survival rate.

two。 Docking method

Pull out the scion from the seedling plate, cut 1 cm oblique from top to bottom with a blade at 1 cm below the seedling leaves of the rootstock, the depth of the incision reaches 95% of the diameter of the Hypocotyl of the rootstock, and the scion cuts 1 cm oblique from the top to the bottom of the cotyledons. Then the two tongue-shaped chimerism, bundled with plastic sheets or clamped with grafting clips, and then dig a small hole in the rootstock nutrition bowl, bury the scion in the soil and water it. Gourd can be used as rootstock in grafting cultivation of watermelon, and rootstock and scion can be sown at the same time.

Seedbed management

It is necessary to strengthen the management of the grafted seedling bed in order to achieve the best survival rate: to keep warm, the suitable temperature for the healing of grafted seedlings is 20-28 ℃, the temperature of the seedling bed must be checked frequently to keep the temperature not higher than 28 ℃ at noon during the day and no less than 20 ℃ at night; moisturizing, the grafted seedlings can not get the water absorbed by the root system of the rootstock before healing, and the scion is easy to wilt. Therefore, it is necessary to maintain 100% air relative humidity within 3 days after grafting, that is, after grafting, the ground is watered thoroughly, the water droplets on the film surface are kept, and the air can be ventilated gradually in 3 days, 1-2 times a day, in the early morning and evening, a small amount of the greenhouse film can be opened 1 week later, the greenhouse film can be opened to cool down, shading, shading, strictly shading within 2 days after grafting, strong light after 2 days, and light can be seen gradually, and there is no need for shading after 1 week. Pay attention to water control, watermelons like to dry and not resistant to moisture, generally do not water and topdressing during the seedling stage, if the seedling bed is too dry, you can pour small water at noon on a sunny day, and foliar spraying urea + photosynthetic nutrient film fertilizer to improve fertilizer absorption when fertilizer deficiency.

In the grafting of watermelons, it is recommended to be carried out in the greenhouse, to ensure temperature and humidity, the survival rate will be high.