Planting technique of cedar

Cedar is an evergreen tree of the family cedar, also known as cedar, pagoda pine, cypress, etc., one of the world-famous garden ornamental tree species, which is favored for its beautiful tree posture, majestic momentum and tall and straight trunk. With strong dust prevention, noise reduction and germicidal ability, it has been widely used in landscaping. Let's take a look at the cedar planting technology.

Cedar growing environment

Cedar grows vigorously on acid soil with mild and cool climate, deep soil layer and good drainage, which requires mild and cool climate and deep and well-drained soil in the upper layer, like plenty of sunshine, but also quietly resistant to shade, acid soil and micro-alkali, 1300 to 3300 meters above sea level. Northern warm temperate deciduous broad-leaved forest, southern warm deciduous broad-leaved forest, middle subtropical evergreen, deciduous broad-leaved forest and evergreen broad-leaved mixed forest. The warm temperate zone with annual precipitation of 600 to 1000 milliliters to the subtropical climate grows best in the middle and lower reaches of the Yangtze River in China.

Propagation technique of Cedar

1. Sowing: the sowing of cedar can be carried out in the middle and last ten days of March, and the sowing amount is 75kg / ha. It can also be sowed early to increase the disease resistance of seedlings. The sandy loam with good drainage and ventilation was selected as the seedbed. Before sowing, soak the seeds in cold water for 1-2 days, dry them and begin to germinate after 3-5 days, which lasts about 1 month, and the germination rate is up to 90%. In the seedling stage, we should pay attention to shading, and prevent and cure the disease and the harm of ground tiger. One-year-old seedlings can reach 30cm to 40cm high and can be transplanted the following spring.

2. Cutting: cutting propagation of cedar can be carried out in both spring and summer. It should be before March 20 in spring and late July in summer. In spring, one-year-old stout branches of young mother trees were cut and treated with rooting powder or 500 mg / L naphthylacetic acid, which could promote rooting. Then insert it into the well-breathable sandy soil, fully water it, and build a double-layer shade shed for shade. In summer, it is appropriate to select the semi-woody branches of the same year as cuttings.

3. Transplant: the propagation seedlings of cedar can be transplanted after staying in bed for 1 or 2 years. The transplant leaves should be carried out from February to March, and the plant should carry a ball and set up a supporting rod. The row spacing of the first transplant is about 50 cm, and the row spacing of the second transplant should be expanded to 1-2 meters. 2-3 times of topdressing should be applied during the growing period. It is easy to be harmed by diseases and insect pests at seedling stage, especially sudden disease and ground tiger. Other pests include grub, big bag moth, pine poison moth, pine tip borer, red wax scale, termites and so on, which should be controlled in time.

Planting technique of cedar

1. Selection basin: purple sand pottery basin or glazed pottery basin should be used for cedar. Large bonsai can use a deep round basin, can also use a variety of stone basins, but must be fixed with wire. Medium-sized bonsai is appropriate to use crabapple-shaped, manger-shaped basin, small seedlings can be planted in the jungle type can be used bauxite or marble and other chisel shallow basin.

2. Using soil: cedar can use slightly acidic sandy loam with loose soil and good drainage. Pots are often used to mix mature pastoral soil or rotten leaf soil with sand.

3. Planting: it is suitable for cedar from March to April in spring and after autumn. Cedar seedlings dug from the ground must take shelter in the soil to facilitate survival. And thinning the withered roots, stretching the fibrous roots, covering them with fine soil, gently shaking the bowl and compacting them with bamboo sticks to make the potted soil and roots firm. The planting position of the trunk should be skewed to one side.

4. Processing: the processing shape of cedar bonsai is mainly climbing, combined with pruning as a supplement. It is appropriate to climb in winter and spring, and brown silk is mostly used for climbing. Cedar trunk stands, side branches spread, so most of the side branches are bent into S shape, the trunk is generally not bent, naturally upward into a big tree, the posture is very simple and beautiful. Can also take the same year born seedlings 5-7, high and low scattered, co-planted into a jungle type, branches and leaves whirling, do not have charm.

5. Tree shape: the cedar tree is tall and straight, and the side branches are flat and stretched. Bonsai production must make use of its natural form, the tree shape to straight dry type, double dry type, oblique dry type, jungle type is better. Branches and leaves through tie-cut, can be made into layers or clouds, maintenance for many years, can become a rigid and soft storage, elegant bonsai.

Pay attention to planting cedar

1. Cedar is a shallow-rooted plant, and the soil pit should not be dug too deep when planting. Deep planting violates the normal growth law of cedar, and the root system grows best and has the highest activity only near the surface of the soil.

2. The yellowing of cedar leaves after transplanting is generally due to iron deficiency, and foliar fertilization is generally adopted. In areas where pine leaves are yellowed and iron deficiency is serious, iron fertilizer must be applied combined with soil. The commonly used iron fertilizers are ferrous sulfate, ammonium ferrous sulfate, ammonium ferrous sulfate and synthetic complex iron such as iron citrate, EDTA-Fe and EDDHA-Fe. In most cases, the effect of soil application is not obvious. Iron fertilizer can be mixed with organic fertilizer, using strip application or hole application.

3. The cedar is afraid of water and drought. Even if it encounters stagnant water once, it will cause lifelong damage to the cedar. From then on, the growth rate decreases greatly, and the color becomes yellow. in serious cases, the pine needle will fall off a small amount, and the cedar will even die soon. Nursery planting must dig more deep ditches in the fields to ensure that the fields are not flooded or stagnant in the rainy season. When planting cedar in the project, the cedar must be planted at a higher place relative to the road surface and the surface of the green island, and no water should be accumulated around it.

4. In early spring, the aboveground temperature is high, the underground temperature is low, the aboveground begins to grow, and the underground part delays the absorption of water and nutrients from the soil due to the influence of temperature, resulting in a lack of nutrition. Plants transfer and regulate the internal environment through their own signals. Decompose the chlorophyll in the leaves to supply nutrients to the growth center, that is, the nutrients for plant growth come from leaves rather than roots. The leaves lose chlorophyll and retain lutein and tear carotene, so they are yellow. If the external environment is not improved, the phenomenon of strip may occur.