First, the cedar habit Cedar is native to India, Afghanistan, and the western part of the Himalayas. It is distributed at an altitude of 1200 to 3,000 meters and is suitable for 1800 to 2,600 meters. Cedar has a long life span, origin can reach 600--700 years, trees up to more than 70 meters, breast diameter 3- 4-meters, dry and straight, less cracking, aromatic, durable, tree posture majestic green, and Nanyang Sugiyama, Japan's Kim Song-song is one of the world's three most famous ornamental tree species, and it is also a valuable timber tree species.
The main types of children's toys are: image toys, technical toys, toys assembled and assembled, building and structural toys, sports toys, music sound toys, labor activities toys, decorative toys and homemade toys. The general educational requirements for toys are: to promote the all-round development of young children, morality, intelligence and beauty; to meet children's age characteristics, to satisfy their aspirations for curiosity, vigilance and exploration activities; to be beautifully shaped and reflect the typical features of things; Activities change, help to encourage learning; meet the health requirements, color non-toxic, easy to clean, disinfect; comply with safety requirements.
Children's toy structure The significance of the game mainly through the children to build a variety of objects or buildings, can promote the development of thinking and hands-on habits, the purpose of the formation of the hand and the use of various materials in the process, you can directly understand the various substances The performance, understanding of the shape of the various materials, quantity, etc., and access to the use of various materials in the structure of knowledge and experience, and children's ability to design, design, can also be exercise. If the blocks to be one by one ride, layer by layer to fight, build a building, built into a reservoir, to go through many failures will be successful, it is a good way to exercise children's will.
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Cedar has a wide range of adaptability to the climate. It can grow from the subtropics to the southern frigid zone. In areas with an annual rainfall of 600-1000 mm, it grows better in the middle and lower reaches of the Yangtze River. Therefore, cedar trees grow well on the slightly alkaline soil of the reclamation site in northern Shaoxing. Cedar has strong cold resistance. In 1995, the absolute minimum temperature in Nanjing reached -15.9 degrees Celsius, and no frost damage was observed. However, it was poorly adapted to the hot and humid climate, and was often poorly growing. Cedar is a positive tree species that can tolerate certain shade in the young stage. Large trees require more light, otherwise the growth is poor. Cedar Hi has deep, fertile, well-drained soil, and can adapt to thin, gravely land, but is afraid of water, low-lying water, or places where groundwater levels are too high and impervious to poor growth or even death. Cedar has weaker wind resistance and poor ability to fight against tobacco smoke. It is sensitive to harmful gases such as sulfur dioxide. During the unfolding period of young leaves, such as high air humidity, young leaves are vulnerable to sulfur dioxide. When killed, young leaves quickly wither and even the whole plant dies. The breeding methods of cedar mainly include sowing method, cutting method, pressing method and grafting method. The main method used is the cutting method and sowing method. The cedar seedlings propagated by sowing method have the advantages of uniform twigs, strong germination power, good tree shape, and strong resistance to adverse environments.
Second, cedar bud seedlings transplanted cedar generally use transplanted saplings. According to my company's many years of experience, it is concluded that generally it grows slowly when planting in small seedlings, and grows more quickly after reaching 3 meters in height, and can grow 1-2 meters in one year. In order to expand the provenance and meet the needs of the market, here is a new technology for transplanting seedlings—transplanting sprouts.
1, the construction of a hotbed to select high-desert, sunny sandy loam soil construction bed, bed width of 1 meter, depending on the length of the seed may be, the bed is 30-40 centimeters higher than the ground, slightly higher in the middle of the bed, surrounded by brick or mud heap , shop pure fine sand. On the warm bed surface bamboo arch cover agricultural plastic film.
2, seed treatment Cedar seed more empty particles, so need to be selected, the empty particles removed, soaked in cold water before sowing 1--2 days, and then 0.3--0.5% potassium permanganate solution soak for half an hour to 1 hour.
3. The sowing date for seeding seedbed sowing is slightly earlier than that of direct seeding field. It is generally sown from late February to early March. Before sowing, the water is soaked in the hotbed, and then the seeds are evenly sowed on the sand. Be sure to put the seeds on the top and sow 1.5--2cm thick sand after sowing. Broadcast one or two children per square meter. The hotbed is often kept moist and the temperature is controlled within 30C. When the temperature of the warming is too high, the plastic film needs to be uncovered and sprayed with water.
4. Transplantation of shoots According to our company's experience, the appropriate season for transplanting is before the end of November and the following year. Seeds are unearthed from late March to late April. In mid-April and late April, the cotyledons of the seedlings were all unfolded. At this time, the seedlings were 4--7 cm high and the main roots were 4--8 cm long. Lateral roots had not yet emerged or had just begun to grow. Such shoots should be moved to a field or container in time. . When transplanting, the sprouts are gently excavated from the sand bed and placed in a seedling pre-filled with fresh water. Move into Daejeon and use a bamboo sword with a width of 2 cm to insert into the soil. Open the hole slightly deeper than the root of the sprout. Put the root of the bud immediately in the middle. If it is transplanted with the container, it can be used. 20--25 cm high, 7--10 cm diameter through-bottom plastic bag, filled with nutrient soil, neatly arranged on a 1-meter wide seedbed. Transplanting shoots, to master the soil can not be too dry over temperature, sprouts should not be large should be large. Ten to fifteen days after transplanting, seedlings grow new roots. Daejeon transplanted plant spacing 3030 cm.
5, seedling management seedling management to grasp the following points: (1) transplant bed to cover a 1-meter-high shade. It was covered early in the morning and was removed in mid-and late August. (2) The seedbed soil moisture should not be too much, do not collect water, and timely drainage in the rainy season. (3) To prevent the damage of underground pests and blights such as earthworms and ground tigers. (4) often weeding loose soil.
Third, Cedar Sowing Seedling cedar has always been used cutting seedlings, survival rate is low. In the past two years, some units have adopted cedar seed sowing and nursery and gained some experience. The focus is on the following:
1. Choose the cedar seedlings in the nursery area for fear of drought and drought. Therefore, nursery gardens should be built on sandy soil where irrigation and drainage facilities are convenient, the soil is slightly acidic, and the soil is deep and fertile. Avoid breeding seedlings on the vegetable fields and nursery lands for many years.
2. The meticulous field nursery should apply enough cake fertilizer or decomposed bar fertilizer as basal fertilizer when plowing. If using fertile fields for raising seedlings, 100 pounds of calcium, magnesium, phosphate fertilizer should be added per acre; before every last acre, every acre Apply 2-3 pounds of enemies or 20-30 pounds of ferrous sulphate to disinfect the soil, and then make a deep ditch sorghum seed bed. The bed surface should be fine and built into a turtle shape; the built bed should be covered with a Layers 3-5 cm thick without germs, fertile, loose and sieved raw soil.
3, carefully sowing seeds before sowing by soaking germination, soaking in cold water for 96 hours best effect; can also be used 45-50C warm water dip for 24 hours, after soaking with 0.1% potassium permanganate disinfection for 30 minutes, then rinse with water Dry sowing, do not bring wet sowing. The sowing time is generally performed before the "spring vernal equinox". It is better not to be late as early as possible. The seeding is better, the spacing is 10-15 cm and the spacing of plants is 4-5 cm; the seeds are inserted into the sowing ditch, and the seeding rate per mu is 15-20 catties. After sowing, it is covered with 0.5-1 cm thick with yellow earth or coke ash.
4. Seedlings cover the seedlings after sowing. This is a key measure for successful cedar seedlings. After planting, it is necessary to cover the soil. In addition, we must apply a thin layer of wolfweed or straw, and spray the water on the surface to keep the surface wet. When over 70% of the seedlings are uncovered, remove the grass and prevent the newly emerged seedlings from being exposed to rain. In case of loss, a short film shed should be erected immediately after the grass cover, and the temperature inside the shed should be managed. When the temperature inside the shed is maintained at 15-20C, ventilation is required; when the outside temperature is above 15C, the weather can be opened during the day. The film is covered at night. When the seedlings grow out of the true leaves, the dwarf shed is removed and the elevated arbor is taken.
Toys are children's angels, why do you say that? Toys play a big role in children's understanding of the world around them. Toys with their bright colors, beautiful, strange shape, dexterous activity, sweet sound, etc. to attract the curiosity and attention of children. Toys are concrete real objects, similar to the physical image that can meet the children's brain, manipulating the desire to fiddle with the object. Variety of toys, changing the gameplay, can cause children's interest, good toys can inspire children's desire to play games, is a textbook for early childhood learning, but also their favorite life partner.
