Fatong is a deciduous tree, up to 30 meters high, and its bark falls off in pieces; The tender branches are yellow-brown and fluffy, and the old branches are bald. After drying, they are reddish brown and have fine lenticels. The leaves are large and oval in outline, 9-18cm wide and 8-16cm long. The bottom is shallow triangle and heart-shaped, or almost truncated. The upper half is palmately 5-7-lobed and sparsely 3-lobed. The central leaf is deeply divided by more than half, 7-9 cm long and 4-6 cm wide. Lobes on both sides are slightly shorter, and there are a few flaky thick teeth on the edge. Petiole is 3-8 cm long, cylindrical, tomentose and swollen at the base; Stipules small, shorter than 1 cm, sheathlike at base.

Cultivation techniques:

1, planting:

Planting is easy to survive before germination in early spring, and the planting soil should be deep and fertile, with organic matter content of 1% ~ 3% and good air permeability. Put the decomposed organic fertilizer on the bottom of into the pit, and then add 20 cm thick ripe soil to mix it fully to avoid burning the roots. If the weather is dry, fill the planting pit with water, and then plant it after the water seeps dry. Paulownia is usually planted with soil balls. It is not easy to take root after deep burial, so shallow planting is appropriate. Usually, the rhizosphere line of the original seedling is flush with the ground or higher than 1 cm to 2 cm.

2, water and fertilizer management:

Water 5 to 7 days after planting. Paulownia trees don't need to be watered often after they survive. Generally, after the soil is thawed, water is poured for the first time before germination. In May, if the weather is dry, you can water it for the second time, which is beneficial to the growth and development of Fraxinus. Watering can be done according to the weather in rainy season. Fatong is drought-resistant and afraid of waterlogging, so pay attention to drainage in rainy days. Because the root of Cortex Fraxini has great respiration ability, it is necessary to prevent the root from rotting and dying due to excessive water and lack of oxygen in the soil. Fertilize in spring and autumn, apply decomposed organic fertilizer once at the periphery of the crown through ring fertilization or hole drilling, and then water it.

3, pruning:

Intertillage and pest control. Alsophila spinulosa does not need special pruning, it can be pruned before transplanting, and at the same time, it can cut off branches that are too dense, sick and dead. In the process of its growth, because of its slow growth, it is generally not pruned. In the process of maintenance, intertillage and weeding are needed in time to reduce weeds, which is beneficial to the growth of trees, improve the ventilation conditions of soil, promote the growth of roots and sprout new roots. Paulownia has few pests and diseases. In the hot and dry years in summer, the seedlings born in that year or newly transplanted seedlings are easy to burn at the stem base, which makes bacteria invade and rot easily after rain. In summer, shade shed can be set up or Bordeaux mixture can be used for prevention and control. The main pest is grubs. Cortex Fraxini is an excellent greening tree species with simple cultivation and extensive management. Management after transplanting is very important, but the porosity of soil and the ratio of root diameter to branch retention will also affect the survival of paulownia.

Growing habits:

Paulownia trees like light, humid and warm climate and are cold-resistant. Suitable for weak acid or neutral soil with good drainage. Weak alkaline soil can grow, but it is easy to turn yellow. The distribution of root system is shallow, so it is easy to be injured and inclined during typhoon. Strong anti-air pollution ability, the blade has the function of absorbing toxic gases and dust retention. The tree has a tall trunk, lush foliage, rapid growth, easy survival and pruning resistance, so it is widely planted as a street greening tree species and a fast-growing timber tree species. It has strong resistance to toxic gases such as sulfur dioxide and chlorine.

Application value:

The tree is majestic, with large leaves and pus, smooth skin and strong adaptability. Widely cultivated all over the world, it is a world-famous excellent shade tree and street tree. With strong adaptability and pruning resistance, it is an excellent street tree species and is widely used in urban greening. It is particularly magnificent when it is planted alone on the lawn or in the open space of the garden and on both sides of the tunnel. Because it has strong resistance to all kinds of toxic gases and can absorb harmful gases, it is very suitable for greening blocks, factories and mines, and the fruit can be used as medicine. Garden trees and street trees. Wood can be used to make furniture.

Cutting propagation:

1, collecting cuttings. Cuttings should be harvested in late autumn and early winter, and the 1 annual branches sprouted on the trunk of seedlings or strong mother trunk are better, and 1 annual branches sprouted at the crown can also be used. In order to ensure the supply of cuttings, a cutting nursery with seedlings can also be established.

2, cutting and processing

After the cuttings are harvested, they are immediately cut into cuttings with the length of 1.5 ~ 20 em, and each cuttings keeps two nodes and three full buds, because there are more nutrients in the branches than in the nodes. The lower incision should be close to the node, generally about 1.5 mm from the base of the bud to facilitate healing and rooting, and the upper incision should be about 0.5 ~ 1.5 mm from the tip of the bud to prevent the terminal bud from wilting due to dehydration. Every 50 ~ 100 cuttings are bundled into 1 bundle, and then a pit of 1 with a depth of 60 ~80cm and a width of 80em is dug on the leeward side with good drainage, and the pit length is determined by the number of cuttings. The bottom of the pit is covered with a layer of virtual soil, and the cuttings stand upright on the virtual soil with their heads down. Finally, cover the soil, cover it into a ball to prevent rainwater from infiltrating, and take it out for cutting the next spring. Harvesting and transplanting can also be done in spring, and the survival rate is also high.

Step 3 cut

Before cutting, you should choose a well-drained, loose and fertile plot, and make it into a cutting bed after deep turning, disinfection and leveling. In early and mid-March, the cuttage bed was irrigated for 65438 0 times, and the whole cuttage bed was covered with plastic film after seepage. At this time, the cuttings stored in the sand are taken out and soaked in rooting agent 1000 times for 2 ~ 3 days, and the rooting agent 1 times is changed every 24 hours. After the dipping is completed, the cuttings are carried out according to the plant spacing of 15em ×30em. Before cutting, drill a hole with a hard stick with the same thickness as the cuttings to a depth of about 10em, and then cut the cuttings until the cuttings are exposed to the ground for about 5em. After the whole bed is inserted, plug the cuttings with fine soil to make the cuttings closely contact with the soil.

Pest control:

The main pests that harm Platanus acerifolia are Anoplophora glabripennis, Anoplophora glabripennis, Black Moth Six Star, and Eupolyphaga fusca. In the prevention and control, various methods such as artificial capture or black light trapping and killing adults, killing eggs, cutting insect branches and centralized treatment were adopted. During the emergence of adults and newly hatched larvae, chemical agents can be used to spray branches or tree crowns with 40% omethoate EC, 50% phoxim EC, 90% trichlorfon crystals and 25% deltamethrin EC 100 ~ 500 times. Prevention and control of larvae that have eaten into xylem by injection and hole plugging. For most larvae of Cerambycidae and Cerambycidae, the following methods can be used: dip 1 ~ 50 times of dichlorvos, omethoate, deltamethrin, etc. with a syringe or cotton wool. Enter the wormhole; The wormhole is blocked with aluminum phosphide or zinc phosphide poison stick and sealed with yellow mud, and the effect is good. Fungal blight of paulownia is the main disease, which can be controlled by changing stubble and raising seedlings. Repeated stubble is strictly prohibited. In autumn, the fallen leaves of seedbed are collected and burned to reduce the source of overwintering bacteria; From late May to July, spraying 1∶2∶200 times of Bordeaux solution on the leaves of seedlings for 2 ~ 3 times has a disease control effect.