The varieties of cool-season turfgrass include Poa pratensis, perennial ryegrass, tall fescue, bentgrass, etc. The suitable growth temperature is 15°C～25°C. If the winter is not properly managed, the lawn blades will dry and yellow prematurely, affecting the appearance. In order to prolong the green period of the cool-season turf and increase the ornamental value, the cold-season turf in the early winter is mainly to strengthen the following aspects of management: 1. Watering the lawn in the early winter to extend the green period to the beginning of December. Water once every 5 to 7 days until the frost wither. In the cold-season lawns in the saline-alkali land in North China, there is a drought death due to lack of water in winter. Therefore, the lawn must be well-watered before entering the winter, but it is necessary to grasp the time and watering of the frozen water. the amount. The frozen water should be carried out when the surface of the surface has just frozen. It is better to freeze frozen water at night and freeze it during the day. The amount of irrigation water should be large enough to fully wet the soil layer, especially in the saline-alkali area, but it is advisable to use flood irrigation, but it is necessary to prevent the occurrence of “ice coverâ€. If the entire winter is in a warm winter state, it is necessary to determine whether or not to fill the frozen water according to the surface water holding capacity. Second, fertilizer Fertilizer applied once in winter, about 1 kg per square meter. Fertilization can promote the growth of underground roots, providing a safe winter over the turf guarantee, while the turf green season will be extended. III. Pruning For the dry and cold winter in North China, the leaves of the cold-season turf will gradually yellow from top to bottom. In order to prolong the green period, the pruning method can be used to gradually reduce the height of the pruning, extend the green period, and trim the low lawn early in the next spring to return to green earlier. Do not trim after freezing so that the lawn has a certain height in order to facilitate the safe wintering of the roots in the dry climate in winter. Fourth, other winter turf will have many trees defoliation and withered grass, should be promptly removed to prevent becoming a source of pests and diseases. When the temperature drops below 0°C, the ground part of the turfgrass will freeze and become stiff. At this time, try not to suppress or trample on the lawn, otherwise the grass will be broken and the grass will be seriously damaged. Generally, when moving on the lawn, wait until the temperature rises at noon or afternoon and the ice in the stems and leaves is melted.
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