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A Detailed Guide to Magnolia denudata Propagation Methods and Key Techniques

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1. Seed propagation. Magnolia denudata seeds mature in September to October in northern regions. Harvest them when the fruit turns red and partially splits open, and select plump, brightly colored seeds for sowing. Magnolia denudata seeds are rich in oil and cannot be stored, so they should be sown immediately after harvest. Because the red seed coat is fragrant and easily eaten by rats, before sowing the seeds must be treated with a rodent-repellent agent, or layered in a wooden bucket or vat with one layer of river sand and one layer of seeds, laid out layer by layer, keeping a certain temperature and humidity for germination. Once the red coat has rotted away and no longer smells fragrant, plant the sprouted seeds in the soil. Fresh seeds can also be placed in

1. Seed propagation. Magnolia denudata seeds mature in September to October in northern regions. Harvest them when the fruit turns red and partially splits open, and select plump, brightly colored seeds for sowing. Magnolia denudata seeds are rich in oil and cannot be stored, so they should be sown immediately after harvest. Because the red seed coat is fragrant and easily eaten by rats, before sowing the seeds must be treated with a rodent-repellent agent, or layered in a wooden bucket or vat with one layer of river sand and one layer of seeds, laid out layer by layer, keeping a certain temperature and humidity for germination. Once the red coat has rotted away and no longer smells fragrant, plant the sprouted seeds in the soil. Fresh seeds can also be soaked for 3 to 5 days in warm water mixed with wood ash, changing the water frequently, rubbing off the waxy layer, and sowing once the seeds have split open.

The seedbed should be made into raised beds 1.2 m wide and 30 cm high, with paths 30 cm wide. On the bed, open furrows crosswise at a row spacing of 20 cm for drilling, with the furrows 3 cm deep; after sowing, cover with 3 cm of soil and then with rice straw. Autumn-sown seeds will sprout in about a month or so. After sprouting, promptly remove the covering, provide shade, and water frequently to keep the environment moist. Strengthen management, remove weeds promptly and apply topdressing; after growing strong, the seedlings can be planted out.

2. Air layering propagation. Air layering is suitable for tall plants or those that are difficult to bend. Select 1- to 3-year-old branches, girdle them 2 to 4 cm, scrape off the cambium or make longitudinal wounds, and wrap the cut with plastic, split bamboo tubes, clay pots, etc., filling with moss or fertile soil, tie firmly, and water frequently to keep moist; once roots form, cut away to make a new plant. The layering time is April to May. Trees with strong vigor and dense branches and leaves can be layered earlier, while weak-crowned trees can be layered 1 to 2 months later.

Branches in the inner canopy and lower part have a higher rooting rate when layered. Layering sites with a high degree of lignification at the bark-stripped and soil-wrapped area have a high rooting rate, while those with a low degree of lignification have a low rooting rate. The bark-stripped area of the layered branch can be directly coated with 0.01% ABT No. 1 rooting powder solution. After layering, the branch can be cut from the crown after 3 to 5 months. The cut layered seedling has weak young roots, and if planted directly, the survival rate is relatively low. Heeling-in is an important technical step for improving the success rate of air-layered plants. Prune the cut layered branches according to their rooting condition. Layered branches with many roots should be left 50 to 60 cm, with the top cut off, branches and excess leaves removed, and 5 to 6 leaves kept per layered branch; layered branches with few roots should be left 20 to 30 cm, generally with no branches or leaves, or with two or three leaves.

Choose a cool, fertile, loose garden plot. Make raised beds 30 cm high and open furrows 15 to 20 cm deep for planting. Remove the plastic film wrapped around the soil ball, trying not to break the soil ball. Soak the base of the layered branch in a 0.005% ABT No. 1 rooting powder aqueous solution for 1 to 2 hours, then plant it on the bed furrow at a spacing of 20 cm. The layered seedling should be planted 15 to 20 cm deep, and the roots and soil should be firmly combined. If the temperature is high, build a shade frame 50 cm high over the bed surface. Strengthen fertilizer and water management, adjust the light on the bed surface, and after 3 to 5 months the strong layered seedlings can leave the nursery.

Magnolia denudata is a rare and precious tree species. It grows slowly, and seed propagation takes a very long time. Air layering propagation requires careful care and management. The seedlings have weak cold resistance, so necessary cold-protection measures must be taken during overwintering, such as wrapping with rice straw, earthing up, and building windbreaks.

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