Hibiscus syriacus (Hibiscus syriacus) is a deciduous shrub or shrub with a height of 3 to 5 m. Flowers born in the year of birth, single leaves, corolla diameter 5 ~ 8cm, trumpet-shaped or pinwheel, single, half or double flaps, colors are pale purple, purple, dark red, pink, red, white, Blue, etc., flowering from June to October. Hibiscus is cultivated in southern China from southeast to southern China, but it is mostly in the Yangtze River valley. The hibiscus continues to bloom for more than 3 months. It blooms in the summer and fall, and has a long flowering period, large flowers, and rich variations. It has a variety of flower types and flower colors. It is a very good garden flower tree species. Because of its strong sprouting and resistance to pruning, it is often used as a backdrop for hedgerows or other low shrubs or is planted on lawns, highway greenbelts, or forest margins.
Cutting propagation is one of the most commonly used methods of propagation for woodploughs. It has the advantages of simple operation, rapid growth of seedlings, high propagation coefficient, and low cost. Especially for some fine varieties, cutting propagation can ensure that their excellent characteristics are not lost.
I. Environmental conditions
The cutting site is the seedbed in the greenhouse of the production base, and the 72-hole plug tray is used as the cutting vessel, and the vermiculite and perlite are mixed in the ratio of 1:3. Before cutting the substrate, it should be disinfected with 1000-fold carbendazim about 3 days in advance, and then covered with a plastic film.
Second, cutting time and cuttings
The optimum time for tender cuttings should be the period of vigorous plant growth from June to July. The mother plants that grow robustly and have no pests are selected, and the annual growth of the plant is well-developed, well-developed, and the shoots without disease and insect pests are used as cuttings. Different cuttings of different growth sites or the same shoots were selected for cuttings, and their rooting rate and rooting quality would have certain differences. In general, the sprouted twigs at the base of the mother plant are more likely to survive than the upper shoots and have good rooting quality. The upper shoots of the same shoot have better rooting than the lower shoots. Cuttings should be inserted with the scissors to prevent loss of water and wilting. Cuttings should be cut into 10 to 15 cm segments. Each cutting leaves 2 full shoots, 2 leaflets, the lower incision is cut into a horseshoe shape, and the incision is near the buds. The upper incision is even and the incision is about lcm from the lateral bud. .
Third, cutting method and post-insertion management
The plastic film covered on the substrate was peeled off before the cutting, and poured thoroughly. The cuttings were sterilized with a 1000-fold solution of carbendazim for 20 minutes, and the next segment was treated with 1000-fold Kuosonaphthalic acid for 30 seconds. Holes were punched with small sticks and the cuttings were inserted into the substrate to a depth of 1/3. In order to ensure the humidity, after the cuttings, the steel wire is used to make the arch cover and cover the shade net. During the rooting process, attention should be paid to the temperature in the booth. Tender cutting temperature should be maintained at 25 °C ~ 28 °C, 25 °C is the best, humidity is 70% ~ 80%, the temperature exceeds 28 °C should be opened film ventilation. The water is sprayed regularly every day. Noon high temperature time is sprayed once every half hour, and other time is sprayed once per hour. To prevent the occurrence of summer rot, spray carbendazim for 3 to 4 days within two weeks after cutting. Rooting begins 14 to 16 days after cutting, and light intensity and ventilation time should be increased after rooting. On the one hand, it is adapted to the external environment, and on the other hand, leaves are prevented from being infected under high temperature and high humidity conditions. About 30 days after cuttings, the seedlings can be transplanted into a nutrient solution containing a nutrient matrix.
IV. Transplanting pots
When the roots of the cuttings are long enough to be visible at the bottom of the plug, transplants are selected on a cloudy day. Cultivation substrate preparation: take perlite and peat in a ratio of 1:3. After the basin is irrigated, it is placed in the greenhouse. The foliar fertilizer is sprayed once every 10 days and sprayed three times in a row to make the seedling safety too slow.
V. Post-plant management
Twig cuttings adapt to the summer high temperature season. Due to the small capacity of the nutrient bowl, the potted soil is very easy to dry, and the root system of the young plantlet just above the pot is fragile. Therefore, the water and fertilizer management after the upper pot is very important. In the two weeks after the upper pot, one to two days will be used to pour water once, and then three days later until the pot is changed. At the same time, watering should not be done to prevent rot. General grasp the principle of see dry see wet. The nutrient solution should be poured regularly. Generally it can bloom in the year and can be transplanted outdoors after hardening.
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