Grafting seedlings is to graft the seedlings of the cultivars onto the rootstocks, and a new seedling is formed from the rootstocks of the rootstocks and the seedlings of the cultivars. Grafting of cucumbers in greenhouses not only improves the ability of plants to resist soil-borne diseases and pests and continuous cropping obstacles, but also improves stress resistance and yield, but the technology must be mastered to be successful.
Scientific seedlings use black seed pumpkin seeds every other year as seed stock for seedlings, sowing seeds for 2 to 3 days before sowing, and soaking with 5 to 10 mg/liter gibberellic acid solution. The seeding method is followed by sowing the rootstock after sowing, and the difference between the two sowing dates is 4 to 5 days; the sowing method first broadcasts the rootstock and then broadcasts the scion, and the sowing date differs by 4 to 5 days. Pre-emergence greenhouse insulation, prompt seedlings quickly unearthed, the general temperature maintained at 25 - 28 °C during the day, maintained at 18 - 19 °C at night. Immediately after the cucumber seedlings unearthed, the temperature of the shed was controlled at about 20°C to prevent overheating of the seedlings. The squash seedlings, on the other hand, had higher temperatures and could be maintained at about 30°C. When the seedbed is watered, it is necessary to pay attention to the weather. Do not water it before cloudy days, especially before the cloudy season of the cold season, to prevent rooting.
Grafting correctly Choose good-grown guava seed grafted on sunny days and operate in a place without wind and direct light. By the method of grafting, the first half of the true leaf of the cucumber is expanded, the rootstock is flattened, or the leaf is grafted when 1 leaf is in 1 heart; the plugging method is applied 10 days after the rootstock is sown, 5-6 days after the seeding is sown, and the cotyledon is grafted during the flattening. . Reliance on the front scion and rootstock must be properly watered to increase the night temperature, so that the hypocotyl elongation to 7-8 centimeters, so as to avoid interface infection after soiling disease. Remove the cucumber and pumpkin seedlings from the seedbed, remove the true leaves of the pumpkin seedlings, and place a knife 0.5 to 1 cm below the cotyledon section. The blades are parallel to the two cotyledon leaves and 30 to 35 degrees diagonally downward from the stems. The depth is from one-half to two-thirds of the stem diameter, the section length is 0.7-1 cm, and then it is chamfered upwards at 1.5-2 cm below the cucumber cotyledon leaf section, and the angle is 25-30 degrees. Two-thirds of the diameter of the stem is the same as the length of the cutting surface of the scion. The two incisions are embedded in each other so that the cucumber cotyledons are pressed against the squash cotyledons and fixed with grafting clips. Immediately after grafting, it was planted on a seedbed. The roots of the scions were buried shallowly and separated from the roots of the rootstocks in order to remove the roots of the scion in the future, and the interface of the graft was kept at a distance of more than 3cm from the soil to prevent contamination. The grafting interface of each seedling is in the same direction so as to cut off the roots after survival. After planting, pour enough water.
The grafted seedlings managed to create a microclimate environment with high temperature, high humidity and weak light within 3 days after grafting, which promoted wound healing. In accordance with the principle of "no apparent wilting, soft touch" principle, ventilation and shading. Specific to grasp a few links. (1) Temperature. The suitable temperature for grafting and healing is 25-30°C. Avoid glare at night and cover the shading. Gradually increase the light exposure time. After 7-8 days, it can no longer be shading. (2) Humidity. After grafting, the relative humidity in the seedbed was kept above 90%. After 2 days, ventilation gradually began to change and the humidity was reduced. However, the humidity in the bed soil and the nutrient bowl should not be too high, so that the roots would not be damaged. (3) cut off the roots. 8 - 10 days after grafting, the color of the scion is green, the leaves are tender, and the root can be cut off at noon. One day before the root cut, the joints of the hypocotyls of the scion were first pinched with a finger, and the next day were cut at a distance of 0.7 - 1 cm from the interface to prevent fracture healing. (4) In addition to rootstock side buds. After the rootstock cuts off the growing point, a large number of indeterminate lateral buds will germinate, which will directly affect the survival of the scion. The adventitious buds formed on the rootstock should be promptly removed. It usually starts 1 week after grafting and once every 2 to 3 days.
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