(1) Cucumber seedlings: Plastic bags with a diameter of 18~20 cm and a length of 25 cm are used to contain culture soil with a relative humidity of about 75%, and a small hole with a diameter of about 0.5 cm is left at each corner of the bag bottom to prevent water seepage. Part of the culture soil in the bag can be filled first, and then the sprouted melons are planted with their heads facing up and their stalks facing down, and covered with soil for 4-6 cm to form a small mound with a high center of the bag mouth. Don't water it, plant it in a greenhouse or shed, and cover it with plastic film to keep it moist. When the temperature is controlled at 15~20℃, the seedlings grow steadily, and the plastic film is removed after the seedlings grow completely. Don't water melons, bagging and uncovering plastic films. If the cultivated soil is wet after removing the plastic film, don't water it in a hurry. The grass on the plastic film is bitter. Open the night cover during the day to let the seedlings fully see the light. With the increase of temperature, the growth of melon seedlings will accelerate, so it is advisable to pour some small water, and it is strictly forbidden to flood with large water, otherwise it will cause rotten melons.
(2) Light embryo seedling raising: that is, the embryo is dug out from the seed melon for seedling raising. 1 optical embryo, generally 5~6 cm long, 2~2.5 cm wide and 2~3 g in weight. Using light embryo to raise seedlings can avoid the dead seedlings caused by the rot of melons, and the survival rate is over 98%. Melons with embryos can also be eaten or used as feed. The method of taking embryos is: when the germinated seeds are separated from the placenta after embryo activity, 3~5 fine roots have been born on the hypocotyl, and then embryos can be seen, some of which are 0.3~0.6 cm long, which is the best time to take embryos. If taken early, the survival rate of melon seedlings is low, the emergence is slow and the potential is weak.
Take out the embryo and raise seedlings with culture soil. The plastic bag for seedling cultivation is 20 cm long and has several water holes at the bottom. Before sowing, the bag can be filled with about 10 cm of culture soil. There are two methods of sowing: one is to put the embryo with bud horizontally, so that the bud faces upwards and covers the cotyledons for 3 ~ 4cm；; A single embryo with long buds can be covered with 1~2 cm soil at the bud exposure. The second is to place the embryo vertically, so that one end with roots is facing down and the other end is facing up. The covering thickness is about 5 cm, so that cotyledons are not exposed.