Seed nursery: ①Seed selection and treatment: as far as possible, choose the climate and other growing conditions more similar to the local fresh seed. Before sowing the seeds need to do germination rate measurement according to the prescribed method. ② Soaking and germination: toon seeds must be soaked and germination treatment before sowing, the method may vary depending on the conditions of production, and it is more difficult to do is constant temperature germination after soaking. If the conditions are poor can be used as follows: container into the seed volume of about 3 times the volume of warm water (30-40 ℃), will be poured into the container of seeds constantly stirring, the water temperature fell to 25 ℃ when replaced with new warm water gently rubbing washing, washing and then replaced with warm water insulation for 12 hours, and then fished out the seeds, drained, and 2-3 volume of wet sand Mixed with 2-3 volume of wet sand, put into the warm bed or greenhouse germination, and then promptly adjust the temperature (about 25 ℃) and humidity (sand humidity to the hand into a ball but not dripping appropriate). About 1 week after 30% of the seeds white can be sown. ③ Appropriate sowing period: toon likes warmth, more sensitive to low temperature, bud sprouting temperature is about 8-12 ℃, 14 ℃ or more can be normal growth. Spring toon suitable sowing period is generally at the end of March to early April. If the sowing is covered with mulch after sowing, the sowing period can also be appropriately early. Choose fertile, loose, well-lit plots as nursery land, before sowing first watering full bottom water, the ground skin dry in time to rake flat, according to 25 × 30 cm line spacing open ditch, ditch width 5-6 cm, while the moisture along the ditch sowing covered with 1 cm thick damp soil. Sowing density of 3-4 kilograms per mu, mu keep seedlings about 15,000 plants. ④ Seedling management: after sowing without mulch cover, the seeds start to emerge in about 7 days, and it takes about half a month for all the seedlings to emerge. If you cover the film can accelerate the emergence of seedlings, but need to pay attention to prevent high temperature damage. Seedlings begin to arch the soil to break the film in time to release the seedlings, and press the mouth of the film to put seedlings. At this time the seedling root system is not developed, coupled with sowing mulch shallow, and thus the most afraid of water shortages and cold, there are 3 true leaves to be irrigated once, it is best to spray 15-20 ℃ of warm water. Seedling height 5 cm after watering should be appropriately reduced, pay attention to mid-tillage loosening and hoeing, foliar spraying of potassium dihydrogen phosphate. 4-5 leaves when the inter-seedling. Inter-seedling to strengthen the water, fertilizer management, cultivate strong seedlings. 6-8 months for the rapid growth of seedlings, but also to cultivate the key period of strong seedlings, this period should be combined with irrigation of phosphorus, potash fertilizer, and with the foliar persecution of fertilizers; to promote the lignification of the seedling, to improve the ability to resist the cold, in order to form the full top buds. In order to cultivate strong seedlings, to prevent the rainy season seedlings from growing in vain, in June after the dwarfing treatment of seedlings, in order to transfer to greenhouse production in the fall to lay a good foundation. At present, it is believed that the treatment of toon seedlings with polyoxazole has the best effect. The method is: perennial seedlings from the end of June, the current year seedlings from mid to late July with 15% polyconazole 200-400 times liquid, every 10-15 days to spray 1 time, even spraying 2-3 times, you can control the growth of futile, early capping and dwarfing, increase dry matter accumulation.