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1, nutritional needs characteristics. Pastures are more common in China and are mainly used as feed for animal husbandry. The cultivated pastures are mainly legumes and grasses. Forage growth requires a large amount of elements such as carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur, as well as boron, manganese, zinc, iron, molybdenum, and Other trace elements. There are similarities between the requirements for nutrient elements in grasses and forage legumes, but there are also differences. Grazing grasses have a stronger demand for nitrogen and are more sensitive to the application of nitrogen fertilizers. Legume forage due to rhizobia symbiotic nitrogen fixation, only a small amount of nitrogen fertilizer can be applied before seedling nodule formation, so its response to nitrogen fertilizer is not as sensitive as grass crops. The legume grass is more sensitive to phosphorus, potassium, calcium and other nutrients than gramineous pasture. The type and amount of nutrients that grasses absorb from the soil depends on the soil conditions, the growth environment, and the species and yield of pasture. The nutrient elements absorbed by the pasture from the soil can not meet the needs of its growth. Only scientific fertilization can meet the nutritional requirements for the growth and development of pasture. 2, pasture fertilization technology. The type, quantity, and application period of pasture fertilization are mainly determined based on the soil fertility status and the amount of fertilizer required for different types of pasture. (1) Base fertilizer: Basal fertilizer is applied in two ways. The first is to use high-quality farmyard fertilizers, such as manure, compost or slow-acting fertilizers, to meet the needs of pastures throughout the growing period, in combination with ploughing the land. Generally, 1000-2500 kg of organic fertilizer and 10% of superphosphate are applied per mu. 20 kg or 20-25 kg of calcium magnesium phosphate fertilizer, 8-10 kg of potassium chloride, spread before ploughing, ploughing after spreading; second, seed fertilizer, seeding and seeding at the same time to meet the needs of the growth of forage grass seedlings. Fertilizer can be applied in the seeding ditch or inside the hole, covered on the seed, or used for seed soaking and seed dressing. The fertilizer used, whether it is farmyard fertilizer or chemical fertilizer, can not affect the emergence of seed germination. (2) Dressing: After the grass has emerged, it is topdressed according to the growth of pasture during its growth period. Fertilizer is mainly based on chemical fertilizers. The top dressing method can be used for spreading, spraying, acupuncture, fertigation or foliar spraying. The topdressing time is generally at the tillering and jointing stage of grasses, and the branches and budding stages of forage legumes. In order to increase the rate of pasture grass production, fertilizer should also be topdressed after each harvest. Perennial forage, every spring to chase 1 fat, promote its long hair early. Phosphorus and potash fertilizers are the main fertilizers in the fall so that pasture can safely pass winter. The grass topdressing is dominated by nitrogen fertilizer, with a certain amount of phosphorus and potassium fertilizers. In addition to recovering nitrogen fertilizers during the seedling period, other legumes mainly used phosphorus and potassium fertilizers.