Plug sowing, sowing 1 seed in each hole, spreading the rootstock seeds with the bud tip facing down, covering the seedbed with sterilized matrix after sowing, spraying the seedbed with 95% Heng Lv 1 wettable powder 3000-4000 times, and covering the seedbed with plastic film for heat preservation. Before emergence, the temperature should be controlled at 28 ~ 30℃ during the day and 20 ~ 22℃ at night. When 50% ~ 70% of seedlings emerge, 3000 times of 95% Lu Heng 1 wettable powder and 600 times of 72.2% Prick aqueous solution are sprayed 1 time respectively, and then sprayed 1 time after the seedlings are full to prevent seedling stage.

② scion sowing?

When the rootstock is spit out, the scion begins to sow, with 5-8 seeds per hole. After sowing, the seedbed is sprayed with 95% Lu Heng 1 wettable powder 3000-4000 times, and covered with plastic film for heat preservation. The temperature controller is used to control the temperature at 28 ~ 30℃ during the day, 22 ~ 25℃ at night, 25 ~ 28℃ during the day after emergence, and 18 ~ 20℃ at night. Grafting can be carried out after the cotyledons of the scion are unfolded.

3. Grafting method?

Grafting is generally used. When grafting, the growing point of the rootstock is removed, and the bamboo stick is attached to the base of the midvein of the cotyledon petiole and inserted obliquely at the base of the other petiole at an angle of about 45 degrees. The bamboo stick slightly penetrates into the epidermis of the rootstock to expose the tip of the bamboo stick, obliquely cuts a knife parallel to the cotyledons at the base of the leaves of the melon seedlings 0.5 cm, and then cuts the hypocotyl into a wedge perpendicular to the cotyledons, with a section length of about 0.5-0.8 cm. Then pull out the bamboo stick, insert the cut scion obliquely into the incision of the root, and strive to achieve "three consistences" when grafting, that is, the thickness of the bamboo stick is consistent with the hypocotyl of the scion, the insertion angle of the bamboo stick is consistent with the incision angle of the scion, and the cutting speed of the scion is consistent with that of the grafting hand.

Management of grafted seedlings?

① temperature management?

After grafting 1 ~ 3 days, the daytime temperature is controlled at 28 ~ 30℃ and the nighttime temperature is controlled at 23 ~ 25℃ with a temperature controller; 4 ~ 6 days, the daytime temperature is controlled at 26 ~ 28℃, and the nighttime temperature is controlled at 23 ~ 25℃. Try to see the light while keeping the scion from wilting. The temperature can be further reduced in 7 ~ 10 days, and the temperature is kept at 22 ~ 25℃ during the day and 18 ~ 20℃ at night. After 1 1 day, the temperature is kept at 20 ~ 25℃ during the day and at 15 ~ 16℃ at night. In case of cold wave or low temperature and rainy weather after grafting, artificial heating can be carried out, but the temperature can be slightly lower, and the temperature at night must be lower than that during the day.

② Humidity management?

The general principle is "no wilting when dry and no water accumulation when wet", that is, the humidity should be controlled within the range of neither wilting nor water accumulation at the scion growth point. Moisturizing is the main method on sunny days, and it is dry but not wet on cloudy days. 65438+ should be mainly moisturized from 0 to 3 days after grafting, and it is appropriate to keep the scion growing without water. 4 ~ 5 days after grafting, it should be ventilated and transparent, and the ventilation time should be based on the scion not wilting. When the scion begins to wilt, it should be moisturized and shaded, and then ventilated and protected from light after recovery. Through this repeated hardening of seedlings, 1 week can enter the normal seedbed management.

3 lighting management?

After grafting, as long as the temperature in the shed does not exceed 3