How to grow Taxus mairei? It is necessary to collect and deal with seeds and control diseases and insect pests.

Taxus is a precious greening tree species in China. Its beautiful leaves are evergreen all the year round and its fruit is red. It has good ornamental value and medicinal value. The following is about the seed collection, treatment, reproduction and cultivation management of Taxus chinensis var. mairei for your reference.

1 seed collection and processing

The seeds matured from November to December and began to be picked when the fruit epidermis turned crimson. Due to the different ripening time, the seeds were picked one batch at a time. The recovered fruit is piled in a cool and moist place, after the pericarp is softened, rinse off the pulp with clean water, remove the seeds, the seeds should be rubbed off the surface wax; the dewaxed seeds are dried for half a day, then stored in ordinary sand, and stored according to the ratio of ∶ sand = 1 ∶ 3, until sown the following year.

2 nursery stock cultivation

2.1 sowing and raising seedlings

2.1.1 selection of nursery land and land preparation

The rice field harvested in the same year with deep soil layer and loose structure was selected as the nursery, and the soil was deeply turned into broken soil, and then divided into beds. The width of the bed is 1.2m and the 20cm is high. About 4000kg of rotten pig and cow manure was applied per mu, and 100kg of instant high-quality compound fertilizer was applied. The fertilizer was well mixed with the soil by mechanical soil preparation, and the border of the seedling bed was covered with a layer of 3cm yellow soil.

2.1.2 sowing

When the radicles of 30% of the seeds are exposed in the following spring, start sowing, sowing or strip sowing; sowing: mix the seeds with burning soil or fine river sand, spread them evenly on the seedbed border, cover the border with a layer of 0.5~1.0cm yellow soil, and cover the seedbed border with hay. Strip sowing: according to the row spacing 15~20cm, the plant spacing 10~15cm opened a sowing ditch about 2cm on the seedbed border, and the seeds were sown into the sowing ditch. After sowing, a layer of 0.5~1.0cm yellow soil was covered on the seedbed border and covered with hay and kept on the seedbed border for a long time.

2.1.3 Seedling management

(1) shading. After sowing, the sunshade net is used to set up a shade shed with a height of 2.0mm. The shading is controlled at about 70% in the early stage and about 50% in the later stage. It is required to cover strictly and tightly, and beware of wind blowing, rodent damage, bird damage and control of underground pests. The sunshade net was removed in late September to facilitate the transparency of seedlings and enhance Lignification.

(2) weeding. Weeds are easy to breed in the early stage of seedling growth, so weeding should be timely and meticulous, and there are more times of weeding.

(3) topdressing. In the seedling stage, the border surface was irrigated with available nitrogen and phosphate fertilizer at the concentration of 0.1-0.3, and the border surface was irrigated with available compound fertilizer at the concentration of 0.1-0.3 every other month in the middle and later stages of seedling growth, and stopped fertilization after September.

(4) Water management. Can be combined with topdressing, the seedling stage is afraid of waterlogging, but also can not accumulate water.

(5) replenishing seedlings. If the seedlings are too dense due to uneven sowing, it is necessary to replenish the seedlings; from the end of May to the middle of June, choose rainy days or after rain for transplanting, after covering the hay, drench with clean water.

(6) overwintering management. In the weather of low temperature and frost injury in winter, a layer of hay can be covered on the seedlings in advance to prevent frostbite.

2.2 raising seedlings in nutrient bags

2.2.1 preparation and bagging of nutritious soil

Mountain red loam or woodland topsoil, river sand, etc., can be used as nutritious soil. The ratio is: red loam (or woodland topsoil) ∶ river sand ∶ burning soil (or plant ash, etc.) = 70% ∶ 20% ∶ 10%, fully mixed; 15cm × 18cm (caliber × height) non-woven nutrition bag soil.

2.2.2 sowing

Start sowing when 30% of the seeds are exposed in the following spring, sowing on demand, sowing 1-2 seeds in each nutrition bag.

2.2.3 Seedling management

After sowing, the sunshade net was used to set up a shade shed with a height of 2.0mm and 2.2m, which was controlled at about 70% in the early stage and about 50% in the later stage. Do a good job in seedling management, such as weeding, fertilization, watering, disease and pest control, and take management measures to sow and raise seedlings.

3 afforestation

3.1 Forest land selection

Taxus chinensis var. mairei is suitable for afforestation under canopy because of its shade. The middle and lower slopes of shady or semi-shady slopes or valleys with canopy density of 0.3 to 0.5 above sea level were selected for afforestation. The requirements of water and fertilizer conditions for afforestation in mountainous areas are higher. Red soil and yellow soil woodland in hilly and mountainous areas should be selected as forest land.

3.2 Woodland clearance

The cutting height of mixed irrigation weeds in woodland did not exceed 10cm. The residue of non-mountain cutting in the woodland accumulated in a belt along the contour line at an interval of 1.5 m.

3.3 ground preparation and digging holes

Afforestation land preparation should use hole reclamation, dig Ming hole, after the hole is dug, the topsoil is backfilled into the hole to form the shape of steamed bread. Applying basic fertilizer (phosphate fertilizer), hole specification 50cm × 50cm × 40cm, and soil preparation in autumn and winter is suitable. The distance between rows is 1.5m × 2m.

3.4 planting techniques

Afforestation season is from January to February. Before planting, the seedlings should be soaked in clean water for 1 to 2 hours, and the seedlings transported from a distance should be soaked for a longer time to supplement the moisture lost by the seedlings. When planting, the roots should be kept open and pressed with the feet to ensure that the roots of the seedlings are in full contact with the soil. After planting, a stick was inserted to straighten the seedling, and the rhizosphere soil was covered with a layer of straw or weeds and other mulch.

4. Tending and management

4.1 weeding and loosening the soil

Timely tending should be carried out after afforestation, weeding and loosening soil should be carried out every year, the first time is in April and May, and the second time is in August and September.

4.2 fertilization

Fertilization is the key technology of cultivation, which is combined with weeding and loosening soil twice a year.

4.3 wiping buds and pruning

Sprouting shoots at the base and branches that are too dense in the middle and lower parts should be wiped and pruned.

5Prevention and control of major diseases and insect pests

The diseases and insect pests of Taxus chinensis var. mairei were less, mainly in seedling stage, and the common diseases were root rot and quenching disease. the control method was sprayed alternately with 800 times topzine or Bordeaux every 15 days after the seedlings were unearthed, and the control effect was better.

Taxus is a very good greening tree species, gathering ornamental value, economic value, medicinal value in one, its planting method is simple, it is worth planting yo, the above is a detailed seed collection and treatment and reproduction and cultivation management methods, you can collect.

Seedling raising method of Taxus mairei under forest

Taxus is the general name of the plant of the genus Taxus. There are about 11 species of the genus, distributed in the Northern Hemisphere. There are 4 species and 1 variety in China.

Taxus is a shallow root plant. Its main root is not obvious and its lateral root is well developed. it is recognized as a natural rare anticancer plant on the verge of extinction in the world. It is an ancient relict tree species left over from Quaternary glaciers and has a history of 2.5 million years on the earth. Due to the slow growth rate and poor regeneration ability of Taxus under natural conditions, there has been no large-scale yew raw material forest base in the world for a long time.

The scientific and technological personnel of the Forestry Institute of Xinning County, Hunan Province have begun the experimental study on the seedling cultivation of Taxus mairei since 1978, and found out a set of seedling raising method under the pine forest according to local conditions in the scientific experiment, which can effectively save labor and reduce the production cost. It is estimated that raising seedlings under the pine forest per mu can save 40 labourers such as transporting mycorrhizal soil, pulling grass, setting up shade sheds, drought resistance, etc., and saving 1200 yuan in shade shed materials, and the production cost can be reduced by 1500 to 2000 yuan per mu. In addition, the method of raising seedlings under the forest can effectively solve the problem of insufficient seedling land in mountainous areas. Therefore, the method of raising seedlings under the forest is worth popularizing in the research and development of Taxus mairei. The specific methods are as follows: (1) seed collection and germination: the seeds of Taxus chinensis var. mairei can be harvested when the fruit is dark red in mid-and late October. Because the seeds are physiological after ripening, they need to be stored in wet sand for one year before they can germinate. The outdoor natural wet sand accumulation method is often used to treat seeds in order to improve the germination rate. (2) nursery site selection and soil preparation: select the middle adult forest of Pinus elliottii or Pinus massoniana with canopy density of 0.6 to 0.7, the slope is relatively gentle, the soil layer is deep and well drained, and the weeds and shrubs in the forest are removed from August to September in autumn. and arranged into a horizontal ladder, dig 20 cm to 30 cm deep, in November, shallow turning fine rake. When preparing the soil, 40 to 60 piculs of rotten base fertilizer are applied per mu, and then the bed is made in separate compartments, and the bed is high. 15 cm to 20 cm, 1.2 m wide. After leveling the surface of the box, press out the sowing ditch with a board 15 cm wide, with a depth of 2 cm and a distance of 20 cm. (3) sowing at the right time: after a year of storage, 30% of the seeds are white, the seeds should be screened out in time, and disinfected in 0.2% potassium permanganate solution for 10 minutes, then rinse with clean water, dry the clear water and sow evenly in the ditch, after sowing, dig up the yellow loam soil with mycorrhizae and sifted under the pine forest, cover the seeds, and the thickness is no seed. (4) after sowing, moss seedlings are planted to protect the seedling bed from Rain Water and direct sunlight, to protect the seedlings from sunburn, to avoid suffocation due to buried stems and leaves, and to keep the soil loose and moist. Reduce the use of ploughing and weeding. (5) strengthen the technical measures such as prevention and control of seedling diseases and insect pests, mid-tillage weeding, fertilization and so on. Through fine management, annual seedlings can reach 12 cm to 18 cm, biennial seedlings can reach 40 cm to 50 cm. How to plant yew _ yew planting method

Taxus, also known as Yew, is a "national treasure" plant of the genus Taxus. Is there any way to grow such a high-end plant? Today we will tell you about the method of planting yew. I hope it will be helpful to you!

Growth habits of Taxus chinensis

Taxus chinensis var. mairei is suitable to be planted in the north and south of China, and it has the characteristics of shade, drought and cold resistance, and the soil PH value is required to be 5.5-7.0.

The environment is shady, can also grow under the dense forest, perennial, can not become a forest. It is more common in the coniferous and broad-leaved mixed forest dominated by Korean pine. Born on stony or barren soil on the top of the mountain, most of them are shrubby. The average annual temperature in the place of origin is 2 ℃ to 7 degrees, and the average annual precipitation is 750-1000 mm. Mostly scattered under the moist, fertile coniferous and broad-leaved mixed forest on shady or semi-shady slopes. Sex likes cool and humid climate, can withstand low temperature below minus 30 ℃, strong cold resistance, the optimum temperature is 20: 25 ℃, it belongs to negative tree species. Like moist but afraid of waterlogging, suitable for planting on loose, moist and well drained sandy loam.

Planting method of Taxus chinensis

Seed propagation

Taxus mairei is mostly propagated by seeds. After the seeds are ripe in November, the fleshy seed coat is washed and dried, then buried in a shady dry place with wet sand, covered with plastic film and grass curtains. The seeds should be turned twice a month in summer and autumn, and the seeds can be sowed and raised at the beginning of March of the following year. The seedbed should choose a leeward and well-drained slightly acidic sandy soil, with a bed width of 1 meter, a ditch width of 40 centimeters, a high ridge from east to west, and a steel plate 25 centimeters high and 4 centimeters thick on both sides of the ridge, with a depth of 10 centimeters. The bed soil requires deep ploughing and fine farming, and carbofuran is applied to control underground insect pests. Use vermiculite, river sand, peat, garden soil, and add carbendazim or methyl thiophanate and other fungicides, mixed into the matrix into the steel plate, 3-5 cm higher than the middle of the side plate. Cover with plastic film and seal and fumigate for 3 to 5 days before sowing. The seeds are distributed evenly on the bed, with about 200 seeds per square metre. After sowing, the seeds are slightly flattened with a wooden board, covered with mixed matrix soil 1 to 2 cm thick, and covered with grass curtains or plastic film for heat preservation and moisturization. Spray water properly in case of dry weather, generally sprouting and sprouting after 40 days. At this time, we should remove the plastic film or grass curtain, and set up a 2-meter-high shade shed above the seedling bed to cover the shade net to prevent direct sunlight. Keep the seedbed moist, build a low arch shed and cover the plastic film on rainy days to prevent too much moisture in the seedbed. Do a good job of drainage and ventilation of seedling bed, timely prevention and control of diseases and insect pests. Apply rotten fresh cake fertilizer and water every 10 days in the seedling stage, and avoid chemical fertilizer and concentrated fertilizer. After a year of careful maintenance and management, the height of the seedlings can reach 15,25cm and have 2 to 3 bifurcated branches. Transplantation can be carried out in early April. The planting land should choose leeward, dry, slightly acidic sandy soil rich in humus, with a depth of 20 cm and 5 kg of mature organic fertilizer per square meter. Rise high ridge, dig deep ditch, ridge width 100 cm, ditch width 30 cm. 5 rows per row, 20 cm between rows and 15 cm between plants. Transplant should be in cloudy days, should be moved with the species, need to transplant with soil balls. Immediately after transplanting, pour water once, and build a 2-meter-high shade shed on it, cover the shade net on sunny days, and remove it on rainy days and at night. Strengthen fertilizer and water management during the growing period, generally applying rotten cake fertilizer and water every 10 days. Do a good job in the control and management of diseases and insect pests. Strengthen shading and cooling in summer and spray water when necessary to create a cool and humid environment conducive to seedling growth. Taxus is not only an excellent material for making high-grade furniture, but also a medicinal material with great medical value, but also an excellent tree species for landscaping. With the maturity and development of its artificial reproduction and cultivation technology, the application range of Taxus will be more extensive.

When breeding seedlings with Taxus seeds, attention should be paid to the storage mode of seeds, mixed storage of sand seeds or temperature control treatment, which has a good effect on sprouting and breaking dormancy habits after overwintering. Before sowing, the seed coat should be rubbed, the seeds should be soaked in warm water and treated with chemicals and hormones. Shading after emergence is the key to raising seedlings. It can prevent the seedlings from burning at high temperature and keep it moist and translucent at 40%. The emergence rate of Taxus chinensis var. mairei and Taxus chinensis var. mairei can reach 7080%, and the seedling emergence temperature is required to be higher than 15 degrees.

The dynamic growth of seedlings was as follows: the plant height and stem diameter of seedlings grew slowly in the first two years of emergence, the plant height generally grew about 10cm a year, and the growth accelerated one year after transplanting. The annual increase of 3 ~ 5 years can reach 20~30cm.

Cuttage propagation

For the cuttage propagation of Taxus mairei, it is better to use twigs in spring and hard branches in autumn. Generally, low-shed shading should be done when cutting. Generally, the survival rate of cutting can reach more than 70%. While conventional cuttings are only about 3% to 20%. The shading rate is not less than 60%. The base of cuttings should be treated carefully. The humidity should be kept at about 750.85% intermittently at the beginning. Avoid water loss caused by strong winds.

The factors affecting the survival rate of cutting are generally: tree age, temperature, concentration of chemical treatment, substrate, season, humidity, variety, and other human factors and so on.

In the process of rooting in the first year, the aboveground part of cuttings grew slowly, but rooting rapidly and lateral roots developed. After transplanting in the second year, further shading treatment and seedbed management are needed. To ensure the corresponding environmental conditions, the growth is accelerated. The growth rate is the fastest in summer and slow in winter and spring. At this time, we should pay attention to the change of temperature, long-term drying can cause growth inhibition or sudden death. However, after the seedlings are strengthened in the seedling bed, the survival rate of Taxus mairei is very high. Rarely die and grow rapidly.

Seedling management

Temperature regulation

After cuttings, the ground temperature of the bed should be maintained at 18 ℃ ~ 25 ℃, the temperature in the shed should be 22 ℃ ~ 28 ℃, and the soil moisture should be 60% ~ 70%.

Seedling stage management

Observe the temperature and humidity in the plastic shed every day. When there are water droplets in the plastic film of the bow shed, there is no shortage of water. When there is no water droplets, it is lack of water. When there is no water, open the plastic film to receive rain or water properly. When the temperature in the shed reaches 30 ℃, the plastic at both ends of the arch shed should be opened in time for ventilation. Seal the plastic film after sunset to keep the temperature in the shed. Remove the upper shade net before snow and move it under the plastic in the bow shed to continue to shade to prevent direct sunlight on the seedlings. About 45 days after cutting, the cuttings began to take root, and basically took root in about 65 days, and 3-5 cm shoots could grow in the same year. After 2 years, transplanting can be carried out, when the root system is more developed and easy to survive. When it grows to 6-8 years old, the sapling is 80-90 cm high.

Weeding and disease prevention

Weeding should be carried out when the grass is just growing. If the grass is big and strong, it will be pulled out together with the seedlings accidentally, or the wind leakage will lead to the death of the seedlings, so it is necessary to pull the grass early and weed frequently to avoid the loss of water and fertilizer. Taxus seedlings are prone to root rot and stem rot in the rainy season. 70% Diexong 400 times liquid can be sprayed and irrigated: seedlings are easy to get leaf blight in the dry and high temperature season. Spray 1% Bordeaux solution to control.

Tissue culture

Tissue culture takes advantage of the totipotency and clonability of plant cells. The tender stem, needles, bark, cambium, aril and embryo of Taxus chinensis were used as explants for culture.

1. Taxus chinensis var. mairei was selected as explant, and a large number of tissue culture seedlings could be obtained in the laboratory after callus formation, rooting, seedling bud formation and so on. After substrate transplanting, seedling training, inspection and epidemic prevention, it becomes a vaccine for production.

two。 The ratio of late to early callus formation of Taxus chinensis var. mairei was different among different species and different plants of the same species. At the same time, it is related to the type of explant, sampling site, collection season, light condition, medium type and so on.

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First, try not to spray fertilizer on the leaves of the newly purchased yew bonsai just sprouting, because at this time the yew bonsai has not really survived or the leaves are too tender, if fertilization will make the leaves or buds shrink and curl. Thus affect the normal germination of new roots, foliar spraying water is not too much, to the foliar surface can see the spray of water but not dripping down for the degree. Spray two hours before dark in the afternoon, do not leave water droplets in the evening (especially when there is a large amount of water), otherwise it will affect the normal growth of tender leaves or the leaves will turn yellow, affecting the healthy growth of plants. The reverse side of the leaf can be sprayed more than the front, because there is a waxy protective film on the front of the leaf, which will hinder the absorption of nutrients and water, while the back of the leaf has no waxy layer, has more stomata and has a strong ability to absorb water and fertilizer. So the back absorbs faster and more than the leaf surface. Depending on the situation and the temperature, once a day or two or three times a day. Note that the room should be ventilated regularly.

Second, for the newly purchased yew bonsai, due to the damage to part of the root system when transplanting from the planting base to the flowerpot, the nutrient supply between the root and the branches and leaves is out of balance, especially for the bonsai with luxuriant branches and leaves. the evaporation of the leaf surface is greater than the absorption of the root system, and the top leaf curls and dries when the potted soil remains moist, so it is best to prune the branches and leaves properly to reduce the moisture of the branches and leaves. Excessive consumption of nutrients should restore root growth as soon as possible, and at the same time, watering should be controlled to keep the basin soil slightly dry, so as to facilitate root growth as soon as possible and speed up the restoration of normal nutrient supply. At the same time, Taxus has strong sprouting ability, especially the new branch growth ability is strong and resistant to pruning, and it will sprout new branches and leaves soon after survival. When necessary, plant rooting or rooting enhancers can be used to irrigate the basin soil every seven days or so, and continuously irrigate three or four times (using good quality products and not too much water) so that the roots can grow quickly and healthily. Restore the supply balance between roots and leaves as soon as possible, and make the yew grow well.

Third, as the yew bonsai is planted in the flowerpot with limited nutrients, it can only provide about half a year for growth, or the plant shape is larger and the nutrient consumption is very large, so it is recommended that consumers had better replace the original pot as soon as possible after purchase. Because our company for bonsai for more than a month of re-bonsai, and stored in the distribution company for a period of time, plus yew like rich and loose soil. It is best to change the basin as soon as possible, when changing the pot to calculate the inner diameter of the flowerpot, the inner diameter of the new pot should be at least five centimeters larger. Before the new buds germinate in February and March every year, pour out the tree and the pot soil together when the basin soil is not dry or wet. Try not to break the original soil ball, if you find that there are too many roots after survival, you can properly cut off the bad roots, put the tree in a new basin, fill it with nutritious soil and press it gently, and only close the soil and roots in the basin can you improve the survival rate. otherwise, the plant is not easy to survive or does not grow vigorously. However, the soil should not be pressed too firmly, if the air cannot be breathed from the roots, the roots will rot and the plants will die. Water thoroughly immediately after planting. And leave the basin in the shade for a few days. After watering, the basin soil can no longer be turned over and pressed, otherwise the basin soil is easy to consolidate, or the soil is too solid and breathable and easy to cause rotten roots.

Fourth, the fertilization method of yew bonsai: nitrogen, phosphorus and potassium fertilizer, nitrogen fertilizer can promote the growth of flowers and plants; phosphorus fertilizer can promote the formation of flowers and fruits; potassium fertilizer can promote stem and root growth.

Because the bonsai is in a limited bowl space. Limited cultivation soil, organic matter is broken down into inorganic salts by bacteria and absorbed by roots. With the consumption of Taxus growth, the nutrients in the basin soil are gradually lacking, resulting in insufficient demand for growth. Although the prepared nutritious soil is used in the bonsai, do not apply fertilizer within three months after buying it back. As long as every seven to ten days, pour about 1000 times of potassium dihydrogen phosphate solution or foliar spray in the evening. Control the amount of water and don't water too much. Only when the leaf color becomes pale, the plant is thin, the leaf is yellowish white, the leaf tip appears "dry burning edge", and the leaf senescence occurs prematurely, apply 1000 times liquid urea and potassium sulfate 800x instant high quality compound fertilizer solution to remove sediment and then irrigate the basin soil. once every other month or so, it is best to use fully mature light bean cake fertilizer water (about 10% 15%) to avoid the tree trunk and apply along the basin wall as far as possible. Apply once a month. Pour clean water again the next day after fertilization, in case the fertilizer is too thick and dilute, the above two fertilizers can be used alternately, or you can dig two small pits in each basin and put five or six grains of urea and seven or eight grains of high-quality compound fertilizer in it. Then cover the soil and water it to dissolve the fertilizer. Taxus bonsai is not allowed to apply raw fertilizer and thick fertilizer. Topdressing should be based on nitrogen and phosphorus fertilizer, not too thick.

Fifth, the watering method of bonsai: the principle is "do not dry, do not water, water thoroughly"

Water is an important part of flowers and trees, all life activities of flowers and trees should be carried out with the participation of water, whether photosynthesis or transpiration, can not be separated from water, water can maintain the swelling and pressure of cells and make branches and leaves straight. But beyond the limit, the plant growth is thin and weak, such as long-term basin soil too much water, it will cause leaves yellowing, deciduous leaves, rotten roots, and even death.

1. Look at the slightly lighter color on the surface of the basin soil, the leaves slightly curl, press the basin soil with your fingers and feel a little soft, and when the sound from tapping the middle and upper part of the basin body with finger joints is relatively dull, the basin soil does not need to be watered, as long as the leaf surface is sprayed to replenish the moisture of the leaves. When the surface of the soil is white, press with your fingers and feel that the soil is hard, and there is a circle of cracks between the basin and the soil, when tapping the middle and upper part of the basin with finger joints gives a clear sound of "bang bang", when the young leaves of the new shoots are withered, the basin soil should be watered. The cracks between the soil and the basin should be compacted with hard objects before watering, and then poured with a large spoon. When pouring water, the spoon should be close to the edge of the basin, and the spoon should be poured in all at once, so that the basin soil can absorb enough water. If you pour a small amount of water into the basin for a while, you can see that the water flows out quickly from the bottom of the basin, indicating that the soil and the basin are not completely compacted. The gap between the basin wall and the soil is pressed and then poured by the application object. When the basin soil structure is normal, it is better for water to seep out slowly from the bottom of the basin for about 40 seconds to one minute after watering. The water temperature must be close to or consistent with the air temperature at that time. When using tap water, you should first put the water in the sun for about three hours before watering, because the light helps to decompose the oxides in the tap water and increase the water temperature. You can also put the water in the big basin for half a day or one night and then water it. If there are many bonsai, you'd better put the water in the big tank to make the water temperature as close as possible to the air temperature and soil temperature. Especially in the hot season, in addition to watering the basin soil, it is also necessary to spray water spray on the leaves to keep them moist for growth. When the basin soil can be kept a little dry and not too wet, each basin must be checked in the light of the actual situation, and be careful not to water too much.

2. The evergreen leaves of Taxus chinensis var. mairei are suitable to be placed indoors. However, the yew bonsai is not easy to be placed in the air outlet of the air conditioner, otherwise it will increase the water evaporation of the yew leaves, easily cause the branches and leaves of the yew to dehydrate quickly, and cause the leaves to curl and dry up. If you turn on the air conditioner in the air conditioner room every day, you should spray the foliar surface every day to maintain the foliar humidity and put a basin of water indoors. In the room with heating in winter in the north, the heat sink should be dispersed far away, and a basin of water should be put on the radiator to increase the indoor air humidity. Summer and autumn temperature more than 30 degrees Celsius should strengthen shading and cooling work, can be moved to the north ventilated room. Spray water to cool down when necessary to create a cool, moist environment to facilitate the growth of the yew. And avoid the western sun shining directly on the room on the yew bonsai. The watering amount of bonsai should be controlled in winter to avoid long-term over-wetness of potted soil, because the plant growth is not exuberant in winter, the volatile water of leaves is less, if the potted soil is too wet for a long time, the surface of potted soil will be hardened and impervious, and it is easy to cause rotten roots. The yew must pay attention to the indoor ventilation when raising the yew indoors.

3. The soil for yew planting should be loose, humus-rich, fertile and slightly acidic (between PH=5.5~7). Tea water can not be poured into the yew bonsai. If you often pour the rest of the tea water, because the tea water contains theophylline and other alkaloids. If the pH of the soil is changed for a while, it will also destroy the organic matter nutrients in the soil. It can inhibit the growth of Taxus and cause excessive soil moisture, hinder the ventilation of basin soil, and cause root rot and stem rot. When there are conditions for a week or so, moving the yew bonsai to the balcony in the evening to receive dew and exposing it to the sun for about one or two hours in the morning (before 10:00 in the morning) is beneficial to the growth of the yew and improve its disease resistance. In summer and autumn, it is necessary to prevent the western sun from shining directly on the yew through the window, so as to prevent the high temperature burning leaves from affecting the ornamental value.

VI. Pay attention to the main points

1. The yew should pay attention to the adjustment of light because the tree is small, so it needs light, but it can not be placed in the strong light for too long. Generally, it can be basked in about two hours before ten o'clock in the morning or after five o'clock every day in summer and autumn. Usually accept more scattered sunlight. Otherwise, the leaf tip will be scorched yellow due to strong light burns, and the indoor ventilation will be maintained, so that the indoor air will not be withered, sagging and other bad growth phenomena.

2. If the young leaves of the new bonsai appear dark yellow and dull, the withering phenomenon of the top of the new shoot is generally caused by overwatering too much soil and impermeable so that part of the roots rot and absorb water. When the ability to absorb fertilizer is weakened, the amount of water should be controlled if the symptoms are mild, and the basin surface soil should be gently loosened with hard and blunt objects to make the basin soil breathable, move to a place that can accept dew every night, and move to a shady place at eight or nine o'clock in the morning, which is conducive to the healthy growth of the root system. If the leaves are yellowed and curled in a short period of time, it means that the root rot is serious, because immediately turn the basin to check the root rot condition, (the normal fibrous root shows a full white shape), if more than half, generally save not alive.

3. Yellow leaves occur in the old leaves from the bottom up, but the new leaves generally grow normally, which is generally caused by the lack of water in the roots and the lack of water in the roots. Sometimes the top leaves dry and curl, touch the dry leaves fall, but the old leaves grow normally, generally caused by the lack of water in the roots, should be watered thoroughly at one time. When watering, the cracks on the edge of the basin must be compacted with objects to prevent the water from quickly leaking from the cracks. To create the illusion of being thoroughly watered, the roots will die due to lack of water over a long time. Move outdoors at night to accept more rain and dew, and receive two hours of sunshine in the morning and evening to restore the growth of the yew.

4. Taxus is suitable for weakly acidic soil. If it is irrigated with alkaline water for a long time, it will cause leaves to change from green to yellow, or even leaves to fall off, due to the addition of acidic nutrients or spraying leaves or watering basin soil with 2/1000 ferrous sulfate solution, once every ten days, three times in a row. It can make the leaves turn green due to alkali yellow.

5. In March and April every year, the yew will sprout a large number of buds and consume a lot of nutrients. At this time, the buds growing toward the inside can be removed to prevent the leaves from yellowing or falling off because the branches are too dense and unventilated. For cross branches, introverted branches can improve ventilation and light transmission, and save excessive consumption of water and nutrients. It is best not to spray liquid fertilizer on the leaf surface at the beginning of bud germination, or to pour thick fertilizer on the root.

6. if the normal amount of fertilizer is applied with urea alone, the concentration of nitrogen fertilizer is generally 1/1000, and if potassium dihydrogen phosphate is used alone, the concentration of phosphate fertilizer is 1/1000 to 2/1000, with an interval of seven to ten days.