Tomatoes have strong branching ability and the ability to produce adventitious roots, so shoots (lateral branches) can be used for cuttings. First, the advantages of cutting seedlings The nursery time is short, and it only takes 25 days from cuttings to transplanting. The roots of seedlings grown with side branch cuttings are thick, strong in growth and stress resistance, and high in yield; the lateral branches and cuttings are vegetatively propagated and can maintain the characteristics of the varieties better. This method is practical and economical, which can greatly save the cost of raising seedlings; it can be used to purposefully select good varieties and use cutting cutting techniques to rapidly expand planting. Second, cutting seedling technology 1. Select cuttings. The lateral branches for cuttings should be selected from plants with strong growth potential and strong disease resistance. The tomato varieties that performed better were Maofen 802, L-402, Jiafen No.10, Israel R144, Jiafen No.17 and so on. Choose disease-free, robust growth, dark green leaves, short internodes, 15-20 cm long, 4 to 5 nodes, good growth points, and soon-to-be or just budding collaterals. 2. Set the seedbed. Select a seedbed with good lighting conditions and a stable temperature. The seedbed is 1.2 meters wide, 5 meters long and 25 centimeters high. Then the bottom of the bed is flat and steady. Seedbed soil preparation: take 6 soils of Datian, 4 organic fertilizers, add 2 kg of urea and 1 kg of potassium dihydrogen phosphate according to 1 cubic meter of seedbed soil, mix and spread into the seedbed, 15 cm thick. Small sheds raise the temperature of the seedbed to prepare cuttings. 3. Cutting treatment. After the collateral is selected, it is gently excised from the base with a blade. The incision should be smooth and horseshoe shaped to facilitate wound healing. Then, cut the leaves within 4 cm of the lower part of the shoots, leaving only the petioles, and remove the other larger leaves by 1/2, leaving 3 to 4 leaves in the upper part. After the cuttings are selected, they can be left to dry in the room for 3 to 5 hours to make the wound slightly dry to facilitate healing. Can also be immersed in the lower end of the cuttings into 50 mg / kg of naphthalene acetic acid dissolved in the night, hold for 10 minutes, remove the clear water after washing, ready for cutting. 4. Cutting method. Using a small wooden stick with the same thickness as the side branch, drill a hole in the seedbed at a density of 13 cm and 13 cm, and then insert the treated branch into the hole with a depth of 5 cm. Small shed to keep warm moisture. In summer, the cuttings should be covered with shade nets, waste plastic films or single-layer newspapers to shade them, and the shading rate should be about 50%. Shades need not be shaded. Third, post-cutting management 1. Seedling management. The temperature of the previous seedbed is maintained at 28°C to 30°C during the day, 17°C to 18°C ​​at night, and the ground temperature is 18°C ​​to 23°C. The relative humidity of the air should be kept above 90%. This stage can be followed by 0.1% urea and potassium dihydrogen phosphate mixture once. 2. Mid-term management. After 5 days of cutting, the wounds of the branches have healed and the adventitious roots begin to sprout. The shoots have a certain ability of absorbing water and absorbing fertilizer. At this time, the daytime temperature is maintained at 25°C to 28°C, nighttime at 15°C to 17°C, and the ground temperature is maintained at 18°C ​​to 23°C. Increase lighting time and intensity and start proper ventilation. Every 5 to 7 days, the foliar fertilizer was sprayed once, and the spraying concentration was the same as that of the previous stage. 3. Late management. After 15 days of cutting, 5 to 7 new roots with a length of 5 cm or more and many short and prominent adventitious roots have germinated at the lower end of the shoot. At this point, normal seedlings can be managed. The daytime temperature of the seedbed was kept at 25°C to 28°C, 14°C to 16°C in the middle of the night and 12°C to 13°C in the middle of the night. Can remove the small shed, shallow cultivator, chase fertilizer fertilizer 2 times. In order to prevent the occurrence of viral diseases, antiviral agent No.1, phytosanitary spirit, virus A and other agents can be sprayed. When the seedlings are grown for a long time, 0.05% to 0.1% of chlormequat can be sprayed. , to improve the resistance of cutting seedlings.
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