Red clover is also called red axle grass, red Dutch cocking rock. Native to small Asian West Asia and southwestern Europe, is one of the most important pasture grass in Europe, the eastern United States, New Zealand and other maritime climate areas. In China, Yunnan, Guizhou, Hunan, Hubei, Jiangxi, Sichuan, Xinjiang and other provinces and autonomous regions are cultivated, and wild state distribution. Red clover is suitable for planting in China's subtropical high mountains, low temperature and rainy areas. At present, the red clover has many good varieties adapted to different environments, can be selected according to local conditions. First, the morphological characteristics: red clover for the legume clover perennial herbaceous plants. General life span of 2 to 4 years. Taproot system, the main root into the soil depth of 60 ~ 90 cm, the root system is mainly distributed in the 0 ~ 30 cm soil layer. Strong branching power, generally 10 to 15, as many as 30, stems from the rhizome, round, hollow, erect or oblique, 50 to 140 cm high. Stipules large, apex acute, membranous, with purple veins. Leaves ternate, leaflets ovate or elliptic, with grayish "V"-shaped markings on the leaf surface, entire. Stem leaves velutinous. Cephalic racemes, borne at the tips of stem branches or in the leaf axils, each inflorescence with 50-100 small flowers, flower color red. The pods are small, with 1 seed per pod. The seeds are reniform or ellipsoid, brownish yellow or purple, with a weight of about 1.5 grams per thousand. Second, biological characteristics: red clover is a legume clover perennial forage, taproot system, the main root is not deep into the soil, lateral roots are developed, more distributed in the 0 ~ 750px soil layer, strong branching force, long sunshine plants, flowering in early October, seed maturity in early July, the whole life span of 220 ~ 230 days. Red clover likes warm and humid climate, not too hot in summer and not too cold in winter areas. The optimal temperature is 15 to 25 ℃, more than 35 ℃, or less than -15 ℃ will make the red clover death, winter -8 ℃ or so can overwintering, and more than 35 ℃ is difficult to cross the summer. Requirements for rainfall in 1000 ~ 2000mm. intolerance of drought, the soil requirements are also more stringent, pH 6 ~ 7 when the most suitable for growth, pH value below 6 should be applied to lime mediation of soil acidity, red clover is not tolerant of waterlogging, to be planted in well-drained plots. Third, nutritional value: red clover is a famous high-quality forage. Red clover is rich in nutrition and high in protein. It is measured, in flowering, dry matter containing 17.1% crude protein, 3.6% crude fat, 21.5% crude fiber, 47.6% nitrogen-free leachate, 10.2% crude ash, and rich in a variety of amino acids and a variety of vitamins, the grass is soft, palatable and good, all kinds of livestock are happy to eat. Red clover is the best fodder for cattle, sheep, horses, deer, geese, ducks, rabbits, fish also like to eat. Pigs also like to eat its grass or grass powder, in the chicken premix add 5% grass powder, can improve the egg laying rate, and reduce the occurrence of disease, promote growth. It can be grazed or made into hay and silage for utilization.