Silver leaves have beautiful appearance, tall trunks and bark silver have a certain ornamental value. Silver in Yangzhou is resistant to drought, salt and alkali resistance, strong adaptability, more resistant to pests and diseases, fast-growing, male, and no pollution to the environment. It is a fine variety of urban greening. Silver hardwood cuttings are difficult to root, and the survival rate is low, which brings a lot of difficulties to the breeding of seedlings. However, the outstanding feature of silver in Yangzhong is the strong sprouting of roots. After the saplings are excavated, the roots left in the ground can sprout new plants as long as they are 2 mm or more in diameter. In addition, a new species of silver in the middle of a silvery young can be sprouted. If properly managed, it can grow 1.2 to 2 meters high. The following is the introduction of the rooting technology of silver in Yangzhong: 1. Creating a mother tree 1. Use a cutting method to create a mother tree. Choose a well-drained, fertile sandy loam as the mother woodland. Hardwood cuttings are used to cultivate the mother trees. 1.1.1 Rigging: Prepare 5,000 kg of high-quality farmyard fertilizer before planting and then dig 25 to 30 cm deep. After well-opened, deep application of nitrogen, phosphorus and potassium compound fertilizer as base fertilizer dosage of 30kg. After the fertilization, ridges are formed and the ridge distance is 70 cm. After the ridges are pressed, the rollers are pressed once for cutting. 1.1.2 Cutting: Before cutting, the cutting base (3cm) is soaked in 10010E-6 concentration ABT rooting powder solution for 10~12h, which can greatly improve the cutting survival rate of silver in Yangzhong. The cutting length was 14cm, the spacing of the cuttings was 10cm, and 10,000 pieces of cuttings per mu were inserted. In the future, irrigation must be done in a timely manner to keep the soil moist. It is more difficult for the temperature of Yang in silver to take root. In order to increase the ground temperature, cuttings can be properly picked up in the evening. In Daqing, it is better to cut in at the end of April. The survival rate of hardwood cuttings in silver is low, and the general survival rate is about 50%. Miao Bao seedlings can be about 4000 strains. 1.1.3 Management after cutting and sticking and survival: After the cuttings have survived and survived, it is necessary to scoop and wipe the buds in a timely manner to strengthen the management of fertilizer and water. When the plant height is 30cm, it is combined with irrigation, followed by applying urea 1 times, and the amount of mu is about 15kg, allowing it to grow rapidly, grow upright trunks and thick lateral roots, and lay a good foundation for root breeding of silver Yang in the coming year. 1.2 Using a 1-year-old root to create a mother tree The 1-year-old silver yang root is planted in the second year of the spring and planted in the mother woodland at a row spacing of 70cm33cm. Mu planting 3000 plants. Apply enough base fertilizer before planting, irrigating after planting, and then ridging. When ridging, do not bury the roots. It is best to make the roots of the roots level with the soil. This will not only moisturize but also not affect the sprouting of the roots. The survival should be promptly wiped and dried. Each strain is left alone. Other management methods are the same as in 1.1.3. 2 After the mother tree is excavated, excavated, and managed after the fall of fallen leaves or in the spring of the second year, the big seedlings are excavated with earthworms and the soil is prepared. Then, 5000 mu of high-quality farmyard fertilizer and 30 kg of nitrogen, phosphorus, and potassium compound fertilizer were applied to the mu, and then the original ridge was ridged (the ridge was not raised too high to prevent the cover soil from affecting germination too deeply). In order to prevent drought, the buds will be affected. After ridging, if the soil is dry, it can be filled with water once. 3 Management after rooting of the mother tree roots 3.1 The roots of the young roots of the buds were dried in late May. The roots left by Yang Zhongqiu in the previous year can germinate 3 to 5 strains of silver. When all the roots of silver in Yang germination. Each root left a single bud, and all other buds were erased. When the buds are set dry, strong buds, weak buds, and mediocre buds must be removed so that the plants will grow neatly in order to avoid the appearance of large and small seedlings. Lateral branches born on the trunk should also be removed in time to promote the growth of the trunk. 3.2 Timely shoveling When the roots of silver in Yangzhong are all germinated, weeds can be eradicated in time. Grasses and weeds can be used to catch nets and weeds. When shoveling grass, be careful not to knock out the buds of silver in Yangling (because of germination). Young buds in silver are very brittle). When the seedling height is 20cm and 50cm, scoop it again. 3.3 Fertilizer and water management timely irrigation when drought, seedling height 30cm combined with irrigation topdressing once urea, mu application of urea 10kg. From late July to early August, combine irrigation or reapply urea on rainy days. The amount of mu is 8kg. After the beginning of autumn, topdressing is stopped and water is properly controlled to prevent the growth of the root system and lignification to reduce the ability to resist cold. If it is well managed, the young silver in the roots of the root sprouts can grow 1.5 to 2 meters high and produce more than 10,000 silver seedlings per mu. The management of post-emergence maternal forests in the second and subsequent years is the same as the method of post-emergence management in the first year. As long as the fertilizer and disease prevention and control are properly managed, it is possible to use the roots of the mother trees for a long period of time to breed silver seedlings in the middle of the tree, and become more and more luxuriant. The establishment of a silver tree in the Yangshuo mother forest and the breeding of silver in the roots is a once-and-for-all breeding technique that should be vigorously promoted. 4 Matters needing attention from the use of the mother tree roots, silver, and silver Zhongyang 4.1 Strengthen the disease prevention Because of the continuous cropping of the mother trees for many years, the pests and diseases will increase. Therefore, pest and disease prevention and control of the mother trees should be strengthened so as to prevent pests and diseases in the mother trees from occurring. , Complete treatment, without leaving the source of infection (common pest and disease prevention and control methods and common Yang pests the same way). After falling leaves, the leaves should be removed every year, transported out of the mother trees and burned, and then sprayed with Bami 5 degrees lime sulfur, which will greatly reduce the occurrence of pests and diseases in the next year. 4.2 When digging as many roots as possible to dig large seedlings, under the premise of ensuring the quality of the seedlings, the excavated roots should be as short as possible, and the roots left in the mother trees should be as long as possible, which is conducive to multi-seedlings in the next year. Strong seedlings. Author unit: Daqing City, Ranghulu District Rural Bureau, Daqing City
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