Breeding techniques of Ulmus pumila

First, choose rootstocks. Rootstocks choose elms widely cultivated in North China. It requires vigorous growth and good dry shape, and the seedlings are three to six years old. Before germination in spring, the tree heads should be cut off according to the required height of about 2-2.5m, and the cross-sectional diameter should be 2-5㎝.

Second, pick the scion.

Collection and preservation of scions: There are two kinds of elm scions, winter scions and spring scions. These two kinds of scions are practical in grafting propagation. Winter spike should be stored at low temperature; Spring ears can be picked and connected with each other, but we should seize the opportunity.

1. Select Ulmus pumila branches with full buds, moderate internode length and full lignification to collect and store the winter ear, and the cut scions can be stored in ditches. Choose a place with high terrain, good drainage, loose soil and sunny back, and dig a deep and wide storage ditch of about1m. The length of the ditch depends on the number of scions. Spread wet sand about 20㎝ thick at the bottom of the ditch, and then spread a layer of scion, a layer of wet sand and a layer of scion.

2. Collection and storage of spring ear: when the juice has started to flow and the winter buds have just started to grow, select 12-year-old branches, wipe off the overgrown leaves, cut into scions with the length of 10- 15㎝, bundle them into bundles, and immerse the base in human water for about/kloc-.

Third, grafting.

2. After grafting 15 days, all the rootstock buds can be erased by the survivors, and the weak buds can be erased by the survivors, and three or five strong buds can be kept. After the next grafting, the surviving seedlings should be released after a month, and the release must be carried out on a cloudy day or a sunny evening, otherwise the newly released buds will easily die because they don't adapt to the dry and hot climate outside. When the bud on the scion grows to 30㎝ long, it is necessary to selectively tie the support to prevent the strong wind from blowing off the scion.

Fourth, management.

Grafted seedlings should strengthen the supply of fertilizer and water, promote their early germination and strong buds, pay attention to pruning, erase the original elm buds from the rootstock, adjust the extension direction of branches, and make the crown shape correct without deviation.

V. Plastic surgery

Elms are generally required to be arranged in an umbrella shape. In the year of grafting survival, 3 ~ 5 main branches are selected from different directions on the same horizontal plane. When the new branches are not lignified, they are tied horizontally outward, and when the new branches are 80 ~ 100㎝, they are squeezed to promote the new branches. When pruning in winter, if the base of the main branch is thicker than 2㎝, it can keep 80㎝ short nodes and less than 2㎝, and it can keep 60㎝ short nodes. Prevent convexity deviation. In the second year, 2 ~ 3 extension branches are selected from each main branch to grow outwards, which can be cut off from the bend of the new shoot to promote the growth of the new shoot, and then the same pruning is carried out to expand the crown, and at the same time, the drooping branches in the inner room and the branches above the umbrella top are cut off in time. After three or four years of cultivation, Ulmus pumila can leave the nursery.

Hydroponics of Chrysanthemum

It is common to beautify the decoration of chrysanthemums at home. Many people plant flowers in pots at home. In fact, some people don't like to plant flowers with soil and decorate their rooms. On the contrary, they prefer clean and refreshing hydroponics. Today, we are going to learn how to hydroponic chrysanthemum: how to hydroponic chrysanthemum?

1, cutting seedlings:

In mid-June, chrysanthemum varieties with moderate plant type were selected, and their overwintering or spring seedlings were used as mother plants, and chrysanthemums with full tops and no pests and diseases were used as cuttings. The cuttings are 5 cm to 7 cm long. After harvesting, remove the basal leaves and keep 2 ~ 3 leaflets. The incision is horseshoe-shaped. The seedbed is made of vermiculite and put into a flowerpot. Disinfect with 50% carbendazim wettable powder 500 times first. The cutting depth is about 2 cm and the spacing between plants is about 3 cm. After inserting, spray it thoroughly with clear water, put the pot into a semi-underground seedbed, and cover it with plastic film and reed curtain. Spraying water once every 3-5 days after cutting can be transplanted in about 20 days.

2, preparing nutrient solution

The inorganic nutrient elements needed to prepare the nutrient solution are: potassium nitrate 69%, calcium superphosphate 18%, magnesium sulfate 9.7%, urea 1.4%, ferrous sulfate 0.69%, manganese sulfate 0.27%, phosphoric acid 0.27%, anhydrous calcium chloride 0.067% and zinc acetate 0.067%.

The ratio of total inorganic elements to water is 1.500 in the early stage (from mid-July to early August), 1.300 in the middle stage (from mid-August to mid-September) and 1.400 in the late stage (from late September to mid-October). At the beginning of July, the chrysanthemum seedlings with complete roots were transplanted into a new flowerpot with an inner diameter of 20 cm and a depth of 14 cm. The substrate is vermiculite, and the drain hole at the bottom of the pot is covered with ceramic tiles.

3. Post-planting management

After planting, spray it with a watering can, cover it with plastic film to prevent rain, and cover it with reed curtain to keep out the light. After 7 days to 10, remove the plastic film and reed curtain and water the nutrient solution every 5 days. After application, some clear water can be sprayed to prevent nutrient solution from leaving on the leaves.

After beginning of autumn, apply nutrient solution every 3 days, and once every 5 days after budding. In case of rain, replenish nutrient solution in time. Because the substrate is soft, chrysanthemum seedlings are prone to lodging, so in the early stage, that is, when the height of chrysanthemum seedlings is 10cm ~ 15cm, it is necessary to spray B9 solution 800 ~ 100 times on the leaves to prevent overgrowth.

Some people don't like to decorate green plants at home with soil seeds, but prefer convenient hydroponic green plants. Hydroponic chrysanthemum is more convenient and cleaner, but it is more suitable for decoration at home, so the steps and methods of hydroponic chrysanthemum arranged above should be collected.

Detailed explanation of grafting method of crab claw orchid

It is not difficult to propagate the crab claw orchid, and its stem can be directly cutted or grafted for propagation. Cutting propagation of Crabapple can be carried out in spring, summer and autumn, but cutting in spring and autumn is the best. When cutting, cut off a few tender stems and air them for 1-2 days. When the incisions are slightly dry, cut them in the middle. The cutting soil is loose sandy soil. After cutting, water it slightly and place it in a cool place. After that, water should be poured every 3-5 days to keep the soil moist. It is not suitable for watering. After about 1 month, the cuttings will germinate the roots. The plant type of cuttage propagation is not beautiful and there are not many flowers. Grafting propagation of Crab claw orchid can be carried out in spring and autumn, and grafting in spring is better. Generally, plants grafted in spring can blossom in winter if they are well maintained.

The specific method of grafting is: the rootstock is usually cactus or trigonal sword. First, cut the top of the rhizome horizontally with a disinfection blade, and then peel it with a blade to make it wedge-shaped. It's best to cut it across the board, and don't cut it repeatedly. Immediately after cutting, it is inserted into the V-shaped mouth of the rootstock, and the depth is about 2-3 cm. In order to prevent the scion from connecting with the interface, it can be fixed with cactus thorns. When grafting, you should gently pinch the incision of the rootstock, let it hold the scion, and stop for a moment, so that the two parts can be closely combined and the liquid can penetrate each other. After that, it is best to wrap it with plastic film and maintain it in a cool and rainproof place. When watering, just keep the soil moist, don't water it too much, and water can't be poured into the joints. It usually takes half a month to survive.

The grafted crab claw orchid has beautiful plant shape, well-developed rootstock root system, vigorous growth, strong plants and many flowers. The common crab claw orchid can blossom that year.

Enterprise technical slogan

1, science and technology revitalize industries, starting with research and development.

2. High-end teams create more emerging industries.

3, scientific research and development, self-reliance.

4. Cutting-edge talent platform to build a science and technology kingdom.

5. Science and technology promote progress, and R&D makes the future.

6. Let science and technology serve the society better.

7. Unity means strength to climb the peak, and Qi Xin makes concerted efforts to forge ahead.

8. Life needs science and technology, and science and technology improve life.

9, innovation and brainstorming, technology research and development.

10, modern frontier science and technology, cooperation * * * achieved good results.

1 1, technological creation, technological merit.

12, today's small inventor, tomorrow's great scientist.

13, cutting-edge technology relies on team strength to develop strategic industries through R&D platform.

14. Strengthen scientific and technological innovation and transform and upgrade traditional industries.

15, think what others don't want and do what others don't want.

16. Establish Scientific Outlook on Development and build a conservation-oriented society!

17, with scientific and technological productivity to prove everything.

18, scientific research and development is the brain that guides action.

19, research new products and develop new technologies.

20. Science and technology are the driving force of R&D, and strong driving force leads to rapid R&D. ..

2 1. Science and technology are the primary productive forces, and development is the last word.

22, technology research and development, industrial development indicator light.

23. Work hard together to create talents and enter new industries.

24. Science and technology are leading and developing rapidly.

25, talent and technology, the frontier to open up new roads.

26, research and development of innovative technologies to promote change.

27, innovation and entrepreneurship to create wonderful, win today and win the future.

28, research and development of integrated technology, committed to technology research and development.

29. Life is wonderful because of creation, and the nation is eternal because of creation!

30.R&D has reached the summit, and talents are gathered.

3 1. Innovation is the soul of a nation's progress and an inexhaustible motive force for a country's prosperity.

32. Innovative technologies create a better future.

33. Technology is rootless and research and development is leading.

34, continuous research and development to occupy the highlands, continuous innovation * * * to achieve good results.

35. Science and technology lead a better life, and innovation leads the future.

36. Set up an R&D team to help scientific and technological innovation.

37. Scientific and technological achievements are wonderful, and research and development lead the future.

38. Development depends on scientific and technological innovation, and science and technology develop new industries.

39. Science and technology make industry, and innovation never stops.

R&D is the wisdom of science and technology.

4 1, advocating science, exploring innovation and challenging new technologies.

42, learn science, love science, speak science, use science!

43, carry forward the spirit of innovation, enhance innovation ability!

44. Emerging strategies, research and development first.

45. Science and technology promote human progress, while R&D leads industrial development.

46. If you want to develop science and technology, I suggest you rely on everyone.

47. Strengthen scientific and technological cooperation and exchanges and take the road of open scientific and technological development.

48. Strive for science and technology, love your family, love your country and love the world.

49. Science and technology guide modern research and development, and research and development will eventually upgrade science and technology.

50. Spread the wings of science and fly the dream of science.

5 1, relying on advanced platform and strong team, let technology lead all the way.

52. The vitality of enterprise's new life leads the new fashion trend.

53. The world has changed and technology has appeared. Although production is slow, China produces high-quality products.

54. Implement the strategy of rejuvenating the city through science and education and take the road of sustainable development.

55. Study hard in science to meet the challenges of the future!

56. In the new world, you are with me.

57. Pay attention to science and technology and create legends.

58. Science and technology make the future, and industry revitalizes life.

59. Life lies in sports, and technology lies in innovation.

60. Encourage youth and light up scientific life.