The first is the fast-growing poplar in America and Holland.
Meihe fast-growing poplar has the following advantages: First, the growth and reproduction speed is fast. When cuttings with a length of 20 cm and a thickness of 1.5 cm are inserted into the soil for propagation, seedlings with a height of about 5 meters and a thickness of 3-5 cm can be grown every year; Second, strong disease resistance; Third, spring germinates early; Fourth, the dry shape is straight and the leaves are large.
It can be used as the first choice for fast-growing and high-yield timber forest, agricultural shelter forest network and highway green passage.
Second, Yang Shanya.
Fast-growing Populus Cunninghamia is a new generation of poplar varieties cultivated by cutting branches, hydroponics, artificial distant hybridization and population selection.
This variety has the advantages of fast growth, high yield, narrow crown, straight stem, good material, strong stress resistance (drought resistance, waterlogging resistance, cold resistance and insect resistance) and wide adaptability, and can grow normally in the climate environment of -3 1℃ to 43℃.
In the south of the Yangtze River valley (29 degrees north latitude), the average height of 1 annual cuttings is 4.7 meters (up to 6.5 meters), and the average DBH is 3.2 cm (up to 4.5 cm). In the north (about 43 degrees north latitude), the average annual tree height is more than 3.5 meters and the average annual DBH is more than 3.2 centimeters.
Third, the giant bully poplar
Its main features are:
(1) is growing rapidly. In Henan experimental area, the annual average DBH is 6.5cm and the height is 6m. In Jiangsu province, the two-year-old DBH is 13 cm and the tree height is 12 m, which shows good fast growth.
(2) Apriona germari. The infection rate of artificial inoculation of Apriona germari and simulated natural insects in Jiangsu Province reached 90%, and the insect infection rate was 65438 07%. In the experimental forest of Henan province, when the susceptible rate of other varieties was 22%, this variety was 4.8%, showing good insect resistance.
(3) Good stability. This variety adopts asexual reproduction, and after ten years of observation, its offspring have no variation.
Fourth, Dan Hongyang
The male and female parents of Danhong fast-growing poplar are both from the United States, and their main characteristics are as follows:
(1) is growing rapidly. The annual average DBH of 2-year-old Populus davidiana planted in Henan is 6.2 cm, and the tree height is 5.5 meters. Generally speaking, the annual average DBH is 5.8 cm and the height is 4.9 meters.
(2) Apriona germari. Its infection rate is zero, which is better than Populus macrophylla.
(3) easy to take root. Populus davidiana has strong rooting ability, the rooting rate and root growth rate are 160% of the control variety, and the rooting period is about 15 days earlier than that of Lin Zhong 46. On the day of hydroponics 15, the root number of Populus davidiana was 1 1, and the number of fibrous roots was significantly higher than that of the control variety.
Verb (abbreviation for verb) China weeping willow
China weeping poplar is Jiao, a planting expert at China International Agricultural Development Research Center. Combining traditional grafting technology with modern technology, a new poplar variety, which is bred by taking local poplar Xiaochenghei as female parent and local weeping willow as male parent for many years, can be used for greening. Its advantages are as follows:
1, fast growth rate: transplanting in the same year, grafting in the same year, fixing the pole for 3-8 meters and hanging to the ground. No flowers and no floc, asexual reproduction.
2, the beauty of the tree: the tree is straight, the skin color is smooth and tender, there is no wax, the branches are bent and fluttering downward. The leaves are dark green and pointed peach-shaped, which can form a spherical crown in 2 years. The tree shape is wonderful and beautiful.
3. Easy pruning and shaping: the length of branches will go with the repair of trunk, and the vertical plane can be enlarged or reduced by manual repair and shaping.
4, strong resistance: wind resistance, cold resistance (no defoliation at -5℃ in winter, no death at -50℃), high temperature resistance, and resistance to many pests and diseases.
5. Wide planting area: Poplar can be planted anywhere in China. Management is the same as ordinary poplar.