Yew, also known as yew, is an evergreen tree that is up to 25 meters high. It is a rare species in the world and is distributed in a small amount in Yunnan, Tibet, Heilongjiang, Jilin, Hubei, Sichuan, Guangxi and Jiangxi provinces. According to studies, paclitaxel extracted from its skin, roots, and leaves has special effects in the prevention and treatment of cancer, leukemia, and AIDS. Paclitaxel is more expensive than gold, so yew has a golden tree. Experts of forestry experts have demonstrated that this tree can be planted both in the north and south of China, and a set of seedling methods that breaks seed dormancy is explored to increase the germination rate from 10% to more than 90%, and the survival rate of cuttings has also increased by 50%. The development of yew seedlings is a difficult problem. Now it is introduced as follows: 1. Seed breeding 1. Seed production: From September to October, mature fruits are harvested, mixed with appropriate amount of coarse sand and water in the basin, and repeatedly washed on the washboard with hands, rinsed with water. Skin, flesh, and sand are placed on the rough concrete floor to rub the seeds several times with the soles to make the seeds water-permeable. 2. Soaking: Before sowing, soaking with 50 degrees of liquor and 40°C warm water (1:1) for 20 minutes, removing and then soaking with 500ppm gibberellin for 24 hours, can induce the production of hydrolase and promote its germination. 3. Seeding: The germination rate after sowing within one week after sowing is above 90%, and the germination rate of sowing in spring will be halved. Winter sowing, late spring emergence. In winter sowing in the south, only cover grasses are needed, and arches or flat membranes are appropriate for the north. Second, cutting seedlings choose 1 to 2 years old shoots, spike length to take about 15 cm, 2/3 ear cutting, base end with 0.05% ABT rooting powder or naphthaleneacetic acid 1000ppm solution for 10 seconds, cutting spacing 15 cm 20 In centimeters, the depth of the soil is 1/3 of the ear length. In the summer and autumn, the yam shed must be placed on the shed. After about 45 days, the seedling rate will be about 80%. The spring will be rooted in more than 50 days and the survival rate will be about 65%. Third, the seedling maintenance 1. Arch protection: If you use flat film dense seeding seedlings, before and after the beginning of spring should always check the seeds, see radicle whitening that is removed cover, change the flat membrane for the arch membrane moisturizing pregermination. After changing the arching film, it is necessary to adjust the temperature and humidity, and open the agricultural film on both sides of the shed in sunny weather to cool down and change the air and cover it in the evening. The seedlings were sprayed with water once every 3 to 4 days to maintain the humidity of 55 to 60% of the seedbed. To prevent rat damage. When the seedlings have 2 leaves and 1 heart, the seedlings should be uncovered. 2. Sparse seedlings and thinning: The amount of yew seedlings used is generally about 5 kilograms per acre and 1.5 to 20,000 seedlings. If the winter sowing seeds too dense, early spring seedlings 3 to 4 leaves 1 heart, according to the spacing of 1520 cm row seedling transplanting. 3. Weeding and topdressing: May to July to cultivator weeding 2 to 3 times, combined with cultivating urea 5 to 10 kilograms per acre, potassium chloride 3 to 5 kilograms per acre applied to the water pouring or flooding rainy day. Can also spray 0.25% of urea and potassium dihydrogen phosphate. 4. Pest control: Yew has strong resistance to stress, fewer pests and diseases, and occasional spiders or aphids. It can be used to control pesticides such as dichlorvos and dimethoate. Eucalyptus nursery one year, the seedling height of 40 cm can be transplanted on pots and pots for bonsai, or afforestation, acre afforestation in mountainous areas, wasteland planted 200.
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