The primula spp is also known as Primrose. Primulae family, primroses are widely cultivated in the world. In recent years, they have developed rapidly and have become important garden flowers. Early spring flowering is an important feature of plants. (I) Morphological characteristics and species Perennial herbaceous plants, but most of them are cultivated in one or two year old flowers. The plants are low in size, and all the leaves are basal, forming rosettes. The flowers are red, yellow, orange, blue, purple, and white. They are arranged in umbels on flower buds, racemes and globose. There are many types of primroses. The most common ones are: 1. Primrose (p. malacoides) is native to Yunnan and has a large variety of horticultural plants. 2. The p.obconica, also known as the primroses of the four seasons, is native to the southwest. The horticultural varieties are rich in color and vivid in color. They have both single and double petals. They are early spring potted plants in the cold room and are widely planted around the world. In Kunming, it blooms all year round, so it is also known as the Four Seasons Primal. 3. Tibetan prunus (p. sinensis), also known as China's primrose, originates from Sichuan, Hubei and other places. The original flower rose purple, gardening species more flower patterns, flowers are pink, orange, dark red, blue and white, etc., is an important cold room winter pot flowers. 4. European p. vulgaris commonly used in p. Acaulis refers to horticultural populations, originating in Western Europe and Southern Europe. Modern horticultural varieties include single flaps and double flaps, as well as flaps. Rich in color, sexually hardy, and exposed in winter in Western Europe, it is an excellent variety for early spring flowering plants, and can also be potted. (II) Ecological habits Primula is a typical warm-temperate plant. Most species are distributed at high latitudes and low altitudes, or at low latitudes and high altitudes. They enjoy a cool, humid environment and good drainage, and are rich in humus. The soil is not tolerant of high temperatures and strong direct sunlight, and most of them are not tolerant to cold. The primroses that are generally used for cold greenhouse pot flowers, such as the E Bao Chun and the Tibetan Primula, should be cultivated in neutral soil. Not frost-resistant, flowering early. The European Primula flowers, which are arranged as exposed flower beds, are suitable for growing in shady or semi-shade environments. They prefer well-drained, humus-rich soils. (3) Propagation methods Primula are mainly seed-breeding, and special horticultural varieties are also ramets or tillers. Seed life is generally short, preferably after sowing, or in dry conditions under low temperature storage. Seeding box or shallow pot sowing. Due to the small size of the seeds, they can be buried after sowing. Seeds germinate need light, hi moist, so it is necessary to cover the glass and cover the newspaper, or put a half shade. 10 to 28 days after germination is completed. The appropriate temperature 15 c ~ 21c, more than 25 c, germination rate decreased significantly, it should avoid the summer season. The sowing time depends on the desired flowering period. If it is winter in cold greenhouse, it can be sown in late spring; if it is early spring, it can be sown in early autumn. Spring blooms in flower beds can also be planted in early autumn. The ramets are usually delivered in the fall. (IV) Cultivation Techniques Primroses cultivation and management wells are not difficult, and they are used for greenhouse potted plants. It takes about 160 days to reach the 12 cm pot market. If sown in July, it can bloom at the beginning of the year. In order to avoid hot weather, sowing in August can also bloom in January. The first time in the shallow basin or wooden box transplantation, the spacing of about 2 cm, or directly on the 8 cm pot, basin soil must not be acidic, and then directly on the 12 cm pot. The depth of planting should be moderate, too deep and easy to rot, too shallow and easy to lodging. Fertilize regularly. The cause of leaf chlorosis may be too wet or poorly drained, in addition to acid in the basin. Not only does it have to be shaded during the summer, but it is also shaded when the sun is strong in the winter to ensure a bright color. Cold-tolerant species, when wintering in open areas north of the Yangtze River, provide leeward conditions and provide minor protection to ensure safety. In August, seedlings were planted in the cold bed for winter, and they could be marketed from February to April. Seedlings are transplanted onto pots, and flower pots are generally limited to 12 cm to 16 cm. 2 years old, pots can be appropriately enlarged. During summers, ventilation should be taken care of, and half yin should be given to prevent showers. Cooling can be achieved by spraying, scaffolding, and ground watering. The minimum temperature of indoor night temperature in winter is controlled around 5c, which should not be too high. However, as a potted plant, if the planting is too late (in October), the overwintering temperature needs to be increased to 10 c in order to accelerate the growth and guarantee timely flowering in the next spring.
Cnc Dental Milling Machine,Metal Dental Milling Machine,Dental Crown Milling Machine,Ceramic Dental Milling Machin
Shandong Carved Intelligent Technology Group Co.,Ltd , https://www.demetdent.com