The seedling raising time is short, it only takes 25 days from cutting to transplanting; the seedlings bred by collateral cuttings have strong roots, strong growth vigor and stress resistance, and good yield; collateral cuttings are asexual reproduction, which can better maintain the characteristics of this variety ; This method is practical and economical, and can greatly save the cost of raising seedlings; you can select good varieties purposefully according to your needs, and use cutting seedling raising technology to rapidly expand planting.
2. Cutting seedling raising technology 1. Choose cuttings. Side branches for cuttings should be selected from plants with strong growth potential and strong disease resistance. Tomato varieties with better performance include Maofen 802, L-402, Jiafen 10, Israel R144, Jiafen 17, etc. Choose disease-free, robust growth, dark green leaves, short internodes, 15-20 cm long, 4 to 5 nodes, intact growth points, and side branches that are about to or just budding as cuttings.
2. Set up the seedbed. Choose areas with good light conditions and stable temperature as seedbeds. The seedbed is 1.2 meters wide, 5 meters long, and 25 cm high. Then flatten the bottom of the bed. Preparation of seedbed soil: Take 6 parts of field soil, 4 parts of organic fertilizer, add 2 kg of urea and 1 kg of potassium dihydrogen phosphate according to 1 cubic meter of seedbed soil, mix well and spread into the seedbed, 15 cm thick, and buckle after being leveled. The small arch shed raises the ground temperature of the seedbed to prepare cuttings.
3. Processing of cuttings. After selecting the lateral branches, gently cut it from the base with a blade. The incision should be smooth and horseshoe-shaped to facilitate wound healing. Then, cut off the leaves within 4 cm of the lower part of the branch, leaving only the petiole, and cut off the other larger leaves by 1/2, leaving 3 to 4 leaves in the middle and upper part. After the cuttings are selected, they can be placed indoors to dry for 3 to 5 hours to make the wound a little dry and facilitate healing. The lower end of the cuttings can also be immersed in 50 mg/kg naphthalene acetic acid solution for 10 minutes, and then rinsed with water to prepare the cuttings.
4. Cutting method. Use a small wooden stick with the same thickness as the lateral branches to punch holes in the seedbed at a density of 13 cm × 13 cm, and then insert the processed branches into the holes to a depth of 5 cm. After insertion, the bed soil is properly compacted and buckled A good small arch, to keep warm and moisturize. In summer, cuttings should be covered with shading nets, waste plastic films or single-layer newspapers, with a shading rate of about 50%, and shading is not necessary on cloudy days.
3. Management after cutting 1. Seedling management. The temperature of the seedbed in the early stage should be kept at 28℃～30℃ during the day, 17℃～18℃ at night, and 18℃～23℃, and the relative humidity of the air should be kept above 90%. During this period, a mixture of 0.1% urea and potassium dihydrogen phosphate can be applied once.
2. Mid-term management. Five days after cutting, the wounds of the branches have healed and adventitious roots have begun to germinate. The branches have a certain ability to absorb water and fertilizer. At this time, the temperature in the daytime is maintained at 25°C to 28°C, and the temperature at night is 15°C to 17°C, while the ground temperature remains at 18°C ​​to 23°C. Increase the light time and intensity, and start proper ventilation. Every 5-7 days, spray foliar fertilizer once, the spraying concentration is the same as the previous period.
3. Post management. After 15 days of cutting, 5 to 7 new roots with a length of more than 5 cm and many short and prominent adventitious roots have germinated at the bottom of the branches. At this time, it can be managed as normal seedlings. The daytime temperature of the seedbed is maintained at 25°C to 28°C, 14°C to 16°C in the first half of the night, and 12°C to 13°C in the second half of the night. The small arch shed can be removed, shallow field tillage, and foliar topdressing 2 times. In order to prevent the occurrence of virus diseases, spray antitoxin No. 1, Phytophyllum, Virus A and other agents. When the cutting seedlings are elongated, you can spray 0.05% to 0.1% chlormequat, 1 before planting. Refine seedlings every week to improve the resistance of cutting seedlings.

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