As winter arrives, turfgrass gradually enters the yellow season. Most people think that the winter lawn does not need to be managed. In fact, the winter management of the lawn has a greater impact on improving the ornamental quality of the lawn and the growth of the lawn the following year. The following describes turfgrass winter management measures based on the type of lawn. First, the management of warm-season turfgrass The warm-season turfgrass entered a dormant phase in winter, and the above-ground parts have already been yellow. The turfgrass itself stopped all activities except weak breathing. During this period, fertilization and spraying have no effect on turfgrass. The main management measures in the winter are as follows: After prune, the blades of turfgrass are flammable and can easily cause fires and damage to surrounding trees. When the turfgrass enters dormancy, it is trimmed and long yellow leaves are cut off, leaving behind the turfgrass residues that do not easily catch fire. At the same time after trimming, the lawn is golden yellow, neat and beautiful, with special effects. It is recommended to trim at a height of 3 to 4 cm. 2. Removal of the grassy warm-season turfgrass has the disadvantage of accumulating the weed layer. The thick layer of weeds is easy to make turfgrass sick. Pests are also prone to overwinter in the hay layer, and the number of diseases and insect pests increases in the coming year. The formation of the subtilis layer is often associated with soil compaction. Therefore, during the winter period, removal of the grass in the lawn lays the foundation for the growth of turfgrass in the coming year. Common Combs are used for combing, and special Shovels can also be used. 3. The ground lawn is uneven, the lawn trimmer is not working properly, and the lawn is difficult to flatten, affecting the appearance quality of the lawn. At the same time, the ground is uneven, the moisture nutrient distribution is uneven, the turfgrass growth is inconsistent, the height is easy to be arid, the recesses are easy to accumulate water, and the summer lawn is easy. Illness, turf quality is difficult to improve. Therefore, it is necessary to reform the lawn with uneven ground. The turf dormancy period can be used to cover the warm-season turfgrass and fill the low-lying part of the local lawn. If it is a sports field lawn, this measure is even more important. In order to achieve the purpose of filling, after the cover soil needs to be leveled. 4. Water warm season turf grass afraid of freezing. Although the dormant turfgrass does not absorb water, if the soil is too dry, the soil heat capacity is small and the soil temperature tends to drop. At this time, the heat capacity of the soil is increased by watering, and the soil temperature is not easily decreased, so that turfgrass can be prevented from being frozen. In addition, if the soil moisture is too low, dormant turfgrass roots can lose water and die. Therefore, winter irrigation should be performed before the warm-season turfgrass overwinters. 5. The inclusion of cool season weeds in addition to weeds in warm-season lawns is a problem because there is no effective selective herbicide to control. However, after the warm-season turfgrass enters the dormant period, the stems and leaves die and cannot absorb any pesticides, but the cold-season weeds (or cool-season turfgrasses) or other cold-season broadleaf weeds have not yet hibernated, and the leaves have Roots can still absorb pesticides. At this time, non-selective herbicides can be sprayed to kill weeds without affecting the annual return of warm-season turfgrass. Second, the management of cold-season turfgrass The cold-season turfgrass can still have life activities when the soil temperature is higher than 5 °C. Although the above-ground leaves do not grow, photosynthesis can be carried out and underground roots can still grow. The long green period is a major advantage of the cool-season turfgrass. If the winter is not properly managed, the lawn blades will dry prematurely and turn yellow, affecting the appearance. The management measures are as follows: Fertilization When the temperature drops below 8°C, the upper part of the turfgrass has basically stopped growing, but it has good photosynthesis and accumulation of energy, which can improve the frost resistance. Fertilization in late autumn can promote the growth of underground roots, providing a safe winter over the turf, and at the same time the turf green season will be prolonged. 2. Watering Although the cold-season turfgrass grows slowly in winter and its water consumption decreases, its life activities still require certain moisture. In addition, the northern regions of China are particularly arid in winter. If the water is not added in time, the soil is too arid and the lawn blades will be prematurely browned. The green period is greatly shortened and the superiority of the cold season turfgrass is lost. 3. Lawless use and trampling are prohibited during frosting. When the temperature drops below -0°C, the above-ground organs of turfgrass will freeze and become rigid. At this time, if mechanical repression or trampling breaks the leaves and leaves of grass, it will seriously damage the lawn. No activities (including trimming) are allowed on the lawn. Until the sun comes out, the temperature rises, the ice in the stems and leaves melts, and activity begins. This is particularly important in the maintenance of stadiums and golf courses. 4. Pruning dry and cold in the north, the upper 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 pruning height and extend the green period. Pruning the low turfgrass returns to early morning in early spring. For certain stadium lawns, in order to ensure a long green period and good functions for the winter turf, underground pipe heating is used to increase the soil temperature and ensure the normal growth of turfgrass. This method has been applied in many researches abroad. China Agricultural Network Editor
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