Dog tooth root, also known as iron grass, climbing grass. Widely distributed in the tropical, subtropical and temperate coastal areas, the southern United States, Africa, Europe, and Asia are located in the south. All provinces and autonomous regions in the south of China's Yellow River Basin are distributed and have been promoted in Guangdong, Guangxi, and other provinces and autonomous regions. They usually grow in riverbanks, meadows, and farmland, and can form a certain area of ​​single-dominant farming. First, the economic value of Bermudagrass is the biggest feature is the ability of seeds and rhizomes to reproduce, its rhizome reproductive ability, fast growth, high yield. Rich in leaves, grass is soft and tasteless, its stems are slightly acidic, and its palatability is good. Cattle, buffaloes, horses, goats, rabbits and other domestic animals all like to eat. When young, pigs and poultry also like to eat. At the young age, the crude protein content accounted for 17.58% of dry matter, 1.95% for crude fat, 29.64% for crude fiber, 36.54% for nitrogen-free extract, and 14.29% for crude ash. It can be cut 3 to 4 times a year. Generally, it can collect 2250--3000 kg of hay per hectare. In the fertile soil and better-managed land, 7500--11 250 kg of hay can be collected per hectare. The root system of Bermudagrass is well-developed and has a large amount of roots. It is a good soil and water conservation plant; it is also a good plant for laying pavilions, playgrounds, parks, yards, greening cities, and beautifying the environment; rhizomes can be used as medicine and have the function of clearing blood. Second, the botany characteristics The dog tooth root is a perennial herb of the genus Gramineae. Rhizomes and stolons vary in length. Stalks are planted on the ground and can grow to more than 2 meters in length; roots can be rooted everywhere, and 1--5 tillers can be grown in each section to become new strains; each section is densely condensed by 2--3 sections and become " Condensation section ", so each section can be long leaf 2--3. The ligule is short, with small cilia, blade strips, 2--10 cm long and 1--3 mm wide. Spikes, 3--6, arranged in fingers at the top of the stem; spikelets arranged on the side of the cob, 2-2.5 mm long, containing 1 florets, anthers do not crack, most can not seed, mainly Asexual reproduction with rhizomes, sepals of equal length, 1 pulse ridge, shorter than the external malleolus; lateral malleolus with 3 veins, hairy ridge; inside and outside the length of axillary, with 2 ridges. The seeds weigh 0.25 grams. Third, the biological characteristics of Cynodon dactylon is spring grass, hot but not cold-resistant, when the weather is cold, poor growth, vulnerable to frost. The average daily temperature grew well above 24°C; when the temperature dropped to 6--9°C, it grew slowly; when the average temperature was -2 - -3°C, the stems and leaves fell to death. In the south of China, germination usually takes place from March to April, and from June to August, it grows vigorously. After November, it gradually withers, the grassy period lasts for more than 8 months, and the growth period is 250-280 days. It can resist drought for a long period of time, but the yield is very low. The range of soils to be adapted is extremely wide, ranging from sand to heavy clays, but it is best to grow in moist, well-drained, moderately viscous soils. Under normal circumstances, Bermudagrass has strong vegetative and reproductive abilities. It grows and spreads on stolons and rhizomes and spreads rapidly under suitable soil conditions. The average daily growth rate is 0.91 cm and the height is as high as 1.4 cm. Bermudagrass dominates the plant community. Fourth, the cultivation techniques of Bermudagrass seed germination rate is very low, few seedlings can emerge, it is necessary to select the soil deep fertile land for ploughing, livestock pen manure per hectare 60,000 - 70,000 kg, superphosphate 150 - 225 kg base fertilizer. Its main cultivation methods are the following. (a) Seeding method uses seeds for breeding. The Bermudagrass seed is small, and the land needs to be meticulously leveled to reach ground and earth. The average daily temperature of seed germination is 18°C, and the seeding rate per hectare is 3.75-11.25 kg. When sowing can be used after seed dressing after sowing, so that the seeds and the soil in good contact, is conducive to seed germination. (b) The planting method uses branches for propagation. Divide 0.6--1.0 meters along the row spacing, and put the cut rhizome into the ditch. The branch slightly reveals the soil surface. (3) The arbuscular transplanting method was used to dig turf of Bermudagrass root, and the ramets were planted in digging holes in the entire good land, paying attention to the upward movement of the plants and buds. (4) Block planting method Cut up the sown turf into small pieces, and dig a hole larger than the turf piece on the land to be planted. Put the turf piece into the hole and fill it with soil. (v) Cutting stemming method The stems and rhizomes of Bermudagrass should be excavated in the early spring and cut into small pieces of 6-10 cm. The mixed soil is sprinkled on the whole land and then promptly repressed to make contact with the soil. Can germinate and grow. After the above several breeding methods are cultivated according to soil moisture conditions suitable irrigation to facilitate survival. The fertility of Bermudagrass is very different, so the cultivation and management of Bermudagrass should pay attention to reasonable fertilization. Organic fertilizer can be used as a base fertilizer before planting, and nitrogen fertilizer should be applied after castration. Fifth, the use of high root yield, good quality, the best cut green feeding. When the grass layer is as high as 40--50 cm, it can be used by cutting, leaving a height of 2 - 3 cm. After cutting 1 - 2 times, fast-acting nitrogen fertilizer should be applied to promote the growth of regenerated grass. It can be cut 1 time in 30-40 days of growing season, and cut 5-6 times in the whole year, producing 15,000-2.3 thousand kilograms of fresh grass per hectare every year, producing 110,000 fresh grass per hectare throughout the year- - 150,000 kilograms can be used to modulate hay or make silage. As Bermudagrass is more resistant to animal trampling, it can also be grazing. Taming it and paying attention to increasing the amount of grass produced can be used as a permanent grass grazing species. China Agricultural Network Editor