A Study Of Breeding Technic On Magnolia Sprengeri Pomp.

A field experiment, which consists of seed treatment, reproduction by seeding, and vegetative multiplication, with Magnolia sprengeri Pomp was conducted to analyze main factors affecting its survival rate. A satisfactory program on raising its survival rate through generative reproduction and vegetative multiplication was formulated, which will provide a basis for its plantation theoretically.1.Seeds of Magnolia sprengeri Pomp are of comprehensive dormancy featured biennial germination. Stratified pre-germination is favourable for stopping its dormancy and for a high germination percentage.2.Different substrates, depths of soil covering, and coverings have significant effects on its seedling emerging rate by seeding as well as seedling growth. The satisfactory program for a high emerging rate and quality of its seedlings is: mixed soil with sand, a 1.5cm-thick soil covering and covered by plastic mulch.3.Substrate and container's size have significant effects on its seedling emerging rate and growth. The satisfactory combination for high quality and quantity of seedlings by container is: 50% of humus + 50% of fine sand with 10cm×20cm containers, which can result in good quality and emerging rate of seedlings as well as a close combination of roots and substrate.4.The satisfactory combination for a high rooting rate of lignified cuttings by cottage is: humus soil, treated with ABT 1 hormone of 50mg/L-1 for 4 hours.5.Environmental factors have obvious effects on the rooting of its shoot cuttings. The satisfactory combination for its high survival rate is: mixed soil with sand, a treatment with ABT 1 hormone of 100mg/L-1 for 12 hours.6.Among local species of Magnolia genus, Magnolia denudate and Magnolia biloba are suitable rootstocks for grafting Magnolia sprengeri. The grafting method, grafting time, and thickness of rootstock all have significant effects on the survival rate of grafted seedlings of Magnolia sprengeri. The suitable grafting method in spring is cut grafting with the best time being the middle of March and the thickness of rootstock more than 0.5cm.