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In recent years, the urban turf-building area has expanded rapidly. Taking Beijing as an example, the turf area has exceeded 50 million square meters, and it is still increasing. However, the rapid development of the urban economy has also caused a series of resource problems, especially the problem of water shortage. The average per capita water resources in Beijing is only 300 cubic meters, which is 1/8 of the country's per capita occupancy and 1/32 of the world's per capita possession. The shortage of water sources has become a limiting factor in the development of urban turf in Beijing, and many cities in China have water shortages to varying degrees. The shortage of water resources has gradually become a bottleneck restricting the development of urban turf. It is an important issue for lawn workers to realize water-saving lawn irrigation. The Grassland Research Institute of China Agricultural University carried out an overview of the water-saving technologies of urban lawns from the selection of turfgrass drought-resistant varieties, the determination of lawn economical irrigation, the choice of lawn water-saving irrigation methods, and the irrigation of reclaimed water. Research shows that the modern turfgrass breeding technology, the application of scientific irrigation methods, and the development of renewable water resources can greatly reduce the waste of water resources on lawns. The lawn is not as expensive as some people say. The research of breeding drought-resistant varieties shows that different types of turfgrass and different varieties in the same species have different water requirements. Therefore, the use of water-saving turfgrass varieties has very important significance for water conservation of lawns. When cultivating turfgrass drought-resistant varieties, in addition to using conventional breeding methods, biotechnology can also be used to introduce drought-resistant genes into turfgrass and obtain new drought-resistant varieties. It has been estimated that transgenic turfgrass with drought-tolerant genes can save half of the water compared to common turfgrass; if planted in large areas, it can save 20% to 30% of irrigation water. One of the key aspects of water-saving irrigation and water-saving irrigation of scientific irrigation turfgrass is to grasp the economic irrigation volume of the lawn. The amount of economic irrigation is the minimum amount of irrigation to ensure the normal growth of turfgrass. It is necessary to maintain the water balance of the turfgrass ecosystem and to avoid excessive water consumption and waste of irrigation. Lawn irrigation should abandon the misconception that no shortage should be made, and realize scientific irrigation for different grass species. The water requirement of the lawn is not only affected by the traits of the turfgrass itself, but also affected by environmental factors, including the maintenance management level, soil moisture content, soil texture and soil fertility. Different sowing rates and stubble heights can cause significant differences in turf water requirements. Different proportions of nitrogen, phosphorus, and potassium fertilization methods resulted in different pruning rates for lawns, and there was a significant positive correlation between the difference in lawn pruning and the turf water requirement. The turf water requirement for applying the quick-effect fertilizer is much higher than that of the turf for releasing the fertilizer. From the perspective of water conservation, the proportion of the quick-acting fertilizer should be reduced in practical management. Irrigation is very important for lawn water saving. In traditional flood irrigation, irrigation is uneven and waste is serious. In recent years, water-saving irrigation projects have been rapidly developed due to the scarcity of water resources. At present, the main water-saving irrigation methods include pipe irrigation, sprinkler irrigation, micro-irrigation and infiltration. Practice has proved that micro-irrigation and sub-irrigation are more suitable for crop ramifications of field crops. For lawns with large areas, many plants, and even distribution, these two irrigation methods are not economically effective. Therefore, the water-saving irrigation of urban lawns mainly uses sprinkler irrigation. An important part of the sprinkler system is the sprinkler. The nozzles can be divided into low pressure, medium pressure and high pressure nozzles according to working pressure. Lawn irrigation is generally selected low pressure sprinklers. Small area lawns or long strip lawns can use short-range low pressure sprinklers; large area lawns such as stadiums, golf course lawns can use medium pressure sprinkler heads. The design of the sprinkler should be reasonable, so that the irrigation surface covered by the sprinkler is even. The sprinkler system should also select the corresponding power pressurization equipment according to the pressure conditions of the water source so that the sprinkler irrigation can achieve the desired effect. The effluent that is reclaimed and treated with reclaimed water is called reclaimed water. It is divided into primary treated water, secondary treated water, and tertiary treated water according to the process. At present, the vast majority of lawn irrigation uses directly tap water or groundwater. On the one hand, lawn irrigation has increased the burden of urban water supply. On the other hand, urban sewage has not been properly used. According to the China Environmental Status Bulletin announced by the State Environmental Protection Administration, the total discharge of wastewater in China was 46 billion tons in 2003, and the development potential is huge. Studies have shown that secondary treatment of water is basically feasible for irrigation of lawns, but it has been found that there are different degrees of browning symptoms in the roots of turfgrasses. This may be due to excessive suspended solids in the secondary treatment water, which accumulates in the soil and blocks the pores of the soil. The permeability of the soil causes physiological stress on the turfgrass. Compared to secondary treated water, the use of tertiary treated water is much safer. It is generally believed that the tertiary treatment water can be used in any place other than non-drinking, including fish farming, irrigation, swimming pools, and irrigation. Although tertiary treatment water is relatively expensive for irrigation, there is a tendency to gradually replace secondary treated water.