The latest culture methods of southern fir

Nanyang fir, also known as Australian fir, scaly leaf fir, tower-shaped Cunninghamia lanceolata, etc., are trees of the genus Cunninghamia lanceolata of Taxodiaceae, and cedar, Japanese golden pine, North American sequoia and golden pine are known as the five major park tree species in the world. They are native to the southeast coastal areas of Oceania, and are now cultivated in the courtyard in Guangdong, Fujian, Taiwan, Hainan, Yunnan, Guangxi and other places in China. Let's take a look at the cultivation methods of Cedar.

Growth habits of Cryptomeria lanceolata

Nanyang fir likes light, seedlings like shade, like warm and humid climate, can not tolerate drought and cold. I like the fertile soil. It has fast growth, strong sprouting ability and strong wind resistance. It needs plenty of sunshine in winter, avoids strong light exposure in summer, and is afraid of the dry gale in northern spring and the hot sun in midsummer. It grows best in the environment with a temperature of 25-30 ℃ and a relative humidity of more than 70%. Pot culture requires loose and fertile soil with high humus content and strong drainage and air permeability.

Propagation methods of Cunninghamia lanceolata

1. Sowing: the seed coat of Cunninghamia lanceolata is solid and the germination rate is low, so it is best to break the seed coat before seed to promote its germination. In addition, the seeded seedlings are vulnerable to diseases and insect pests, so the soil used should be strictly disinfected. Seeds had better be germinated by sand bed or the above-mentioned shell-breaking sowing method to improve the germination rate of seeds, which can germinate in about 30 days.

2. Cutting: the cuttage propagation of Cunninghamia lanceolata is easy and widely used. Generally, cuttings are carried out in spring and summer, but the main branches must be selected as cuttings, and the plants grown with side branches as cuttings are askew rather than straight. The cuttings are 10 to 15 cm long and can take root in about 4 months under the conditions of 18 ℃ to 25 ℃ and high air humidity. If the base of cuttings is soaked in 200ppm indolebutyric acid for 5 hours before cutting, it can promote its rooting ahead of time.

Transplanting techniques of Cunninghamia lanceolata

1. Root protection: the lateral roots of young seedlings of Cunninghamia lanceolata are rare, the hairy roots are fine, and they will wither and dry if they are not paid attention to, so it is very important to protect the roots of seedlings. First of all, the soil should be transported with the basin, and the original culture soil should be kept wet. Secondly, the seedlings should be planted immediately after they are bought back. If it is too late for planting, they should be placed in a cool and moist place and should not be exposed to the sun, so as to protect the seedlings, especially the root system. In addition, when the temperature is low in winter, the root system is easy to be frozen during transportation, so attention should be paid to heat preservation.

2. Fine planting: when planting Cunninghamia lanceolata, the seedlings should take the original soil as far as possible, the planting soil should be loose and fine, do not press the root soil too hard, and pour enough fixed root water after planting. In addition, the taproot of seed-sown seedlings is long, and the planting should be deeper, so as not to expose and lodge the roots and affect the survival.

3. Heat preservation: Cunninghamia lanceolata is not cold-resistant. If you buy seedlings in winter or early spring, you should not only pay attention to anti-freezing in the process of transportation, but also have heat preservation measures after planting, such as planting in a greenhouse or covered with plastic film arch. At the same time, Cunninghamia lanceolata is a shade-tolerant flower, and its seedlings are more afraid of sun exposure, so it should be shaded immediately after planting.

4. Broken and disabled: the tissue of Cunninghamia lanceolata seedlings is young and easy to be broken, which can be remedied by the following measures. The seedlings with broken roots can be washed with clean water and inserted in plain sand. At suitable temperature, the roots can be re-rooted from the cross section after 1-2 weeks, and then planted after the root system is developed. The seedlings with broken buds, broken stems and leaves can be fixed as usual, and new buds will sprout after a certain period of time after survival.

Culture methods of Cryptomeria fortunei

1. Soil: Cunninghamia lanceolata is cultivated in Guangdong, Fujian, Hainan, Yunnan and Guangxi, while the Yangtze River valley and its northern cities are potted and overwintered in greenhouse. It is most suitable to prepare rotten leaf soil, garden soil and river sand with rotten leaf soil, garden soil and river sand.

2. Watering: Cunninghamia lanceolata likes the humid environment, so we should pay attention to spraying clear water to the leaves in dry season and summer, which can not only increase the air humidity, but also keep the leaf color fresh and bright, which is very beneficial to its photosynthesis. Watering should be appropriate during maintenance and adequate in summer to supplement the need for foliar transpiration in time and avoid drought damage. But watering can not be excessive, so that the basin soil stagnant water, usually in order to keep the basin soil often moist.

3, light: Nanyang Shanxi has plenty of sunshine, the northern area generally moves to the south balcony or courtyard sunny place in early May, pay attention to proper shade after summer to avoid exposure. Farming in the north will be moved indoors at the end of September and the beginning of October, where there is plenty of sunshine, and watering should be controlled.

4. Temperature: Cunninghamia lanceolata prefers warm and humid climate, does not tolerate drought and cold, and can grow at many different temperatures, but the cold tolerance is not strong. The optimum temperature for growth is 724 ℃. If the temperature increases, it will increase the air humidity around the plant.

5. Fertilization: Cunninghamia lanceolata grows rapidly, so in its vigorous growth season, topdressing is often needed to supplement the nutrients needed for its growth. Generally, from the time of new bud germination in spring, we should pay attention to topdressing rotten thin cake fertilizer and water twice a month for its absorption and utilization in order to grow healthily.

6. Pruning: the lower branches and leaves of Cunninghamia lanceolata are easy to wither and yellow and fall off gradually, which causes the whole plant to be top-heavy and beautiful, so it should be carefully managed and pruned as necessary.

7. Insect pests: the diseases of Cunninghamia lanceolata include leaf spot, branch blight and root nodule disease. The leaf spot and branch blight can be sprayed with 800x solution of 70% methyl topiramate or 50000x solution of 65% zinc wettable powder. The canker was smeared and disinfected with 1000 times of 40% thiomethyl arsenic or 1000 times of potassium permanganate, and the root nodules were soaked with 1000 times of streptomycin. Insect pests are mainly harmful to shell insects. When a small number of pests occur, wash the leaves with clean water, and in more serious cases, you can use 40% omethoate emulsion 500 to 1000 times liquid spray.