Bitter gourd is a thermophilic crop, and the greenhouse production requires a crop that is resistant to low temperature and low light. Therefore, it is necessary to use black seed pumpkin resistant to low temperature and low light as the rootstock for grafting so that the bitter gourd can grow normally at a low temperature of 10°C. First, choose rootstock and scion. Rootstocks can be used with 90-1 pumpkin or Yunnan black-skinned squash, scion with Lanshan Changbai bitter gourd or 89-1 bitter gourd. Second, soaking germination. The selected bitter gourd and black seed pumpkin seeds were soaked in hot water at 55-60°C and stirred continuously to evenly heat the seeds. After 10 to 15 minutes, soak the water temperature to about 30°C. Bitter gourd seeds soaked for 12 hours, black seed pumpkin soaked for 8 hours, after repeated rubbing, rinse with clean water, into a breathable bag, put germination in a warm place, washed once a day with warm water at 30 °C, leaching excess water, Turn the seeds and wait until 35% of the seeds are white. Third, timely sowing. In mid-December, the hotline nursed the seedlings. The temperature was controlled at 32°C during the day and 22°C at night. Black-skinned squash is sown 1 to 2 days later than bitter gourd. Fourth, grafting and management. When the pumpkin seedling grows out of the heart leaf, the bitter gourd seedling grows up to a leaf and it can be grafted (by abutment method). Before you connect, you need to water the seedbed. After 1~3 days, shading should be performed throughout the day. After 3 days, light is blocked at 10 o'clock in the morning and 3 o'clock in the afternoon, and the rest of the day is lighted. The temperature is controlled at 32°C during the day, 20°C at night, and the humidity is about 90%. After 7 days, the plants were no longer shading. On the 8th to 10th day, the young roots of bitter gourd were cut off with a thin blade and appropriately cooled. The temperature was controlled at 25° C. during the day and 15° C. at night. The night temperature was reduced to 10° C. for 5 days before planting, and the seedlings were grown at low temperature. Improve the adaptability to low temperatures. Fifth, colonization. Grafting seedlings of bitter gourd were planted in the greenhouse at the end of January. 8000 kg of high-quality farmyard fertilizer per acre, 100-150 kg of cooked cake fertilizer and 80 kg of compound fertilizer for Vegetables were planted. Planting spacing 80 cm, 30 cm spacing, 3000 acres planted. It is advisable not to bury the interface when planting seedlings. In order to increase the indoor temperature, the planting can be preceded by pouring 40 to 50°C warm water, and then 3 to 4 days before pouring the water once. Sixth, management after planting. Pour the osmotic water until the soil surface is slightly dry. The cultivator is combined with the cultivator to cultivate the soil in the roots. After the vines are pumped, they should be racked in time. After the vines reach 30 cm, the vines will be tied up. After every 4 to 5 knots, the vines will be tied once. Leave 2-3 side vines per plant and remove all others. No longer pruning in the middle and late, but need to remove the lower yellow leaves.
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