Winter green grass species (such as ryegrass, bluegrass) are sown on green lawns to form evergreen lawns. In Shanghai and Nanjing areas, ryegrass is planted on the Bermudagrass lawn, regardless of landscape and use value, it is superior to single-use high-straw buds and other winter and green lawns. The cultivation and management costs are similar or slightly lower, but what is lacking is the need to annually Covering the broadcast is more complicated. The Yangtze River Delta region is located in the transition zone between the north and the south. Due to the extreme heat in summer and the cold in winter, the situation of turfgrass establishment has emerged: the establishment of a cold-season turf, although the green period is long, the management intensity is high and the management cost is high; Seasonal lawns, though relatively simple in management, have a short green period and a brown period of about 5 months, and are also prone to fire. Now, it is an effective way to solve the above-mentioned contradiction that we promote the winter season turf to cover ryegrass in winter. 1, the choice of grass species The establishment of lawns and the selection of grass species are the most important steps. If you choose a good one, you can do more with less. If you do not choose well, you will get twice the result with half the effort and you will even lose all your power. Covering the lawn is also a good choice for seeding grass. It should be said that many cold-season grass species can also be covered in warm-season lawns, such as rough stem bluegrass and tall fescue. However, due to slow seedling emergence, poor uniformity of seedling emergence, unsatisfactory leaf color, premature and late degradation, and high prices, these cold-season grasses are used in comparison with ryegrass. Gaining broadcasts has no advantage. What kind of ryegrass species is selected for cover sowing can be achieved both economically and beautifully? The requirements for grass seeding for covering turfgrass are: (1) Build a flat fast. Before the warm-season turf is yellowed, the turf grows faster to maintain the viewing and use of the lawn. (2) Ping Ping is good. After sowing the grass and planting the turf, it must first be beautiful in color, followed by strong cold resistance, and easy to manage. (3) Deterioration is rapid. In the spring when the warm-season grasses are recovering in spring, the cover turf should disappear as soon as possible so that the warm season turf can quickly turn green. (4) The price is low. The annual epidemic ryegrass “Pandora†introduced by the Texas A&M large-scale breeding project has been used for winter coverage in the middle and lower reaches of the Yangtze River in Nanjing, Shanghai, Ma'anshan, and Anqing in recent years. "Pandora" can be used not only for general greening of parks, factories, institutions, etc., but also for golf courses, stadiums, and other places where turf quality requirements are high. The soccer stadium of Nanjing Olympic Sports Center is covered with it. The botany characteristics of “Pandoraâ€: 1 The seedlings grow quickly, begin to germinate 2–4 days under ideal conditions, and are well-plated after 21 days. The speed of establishment is significantly higher than that of perennial ryegrass. 2 has a l students. Slow growth after landing, which can reduce the number of pruning. 8 green color, beautiful and attractive, excellent pingguan effect. 4 low temperature resistance and good resistance. 5 Spring is degraded quickly and it is easy to make cold-season grass The flat transitions to warm-season turf in order to facilitate the rapid turn-on of the warm seasonal turf. 2, sowing time Selecting an appropriate sowing date is an important part of the success of the coverage. Prematurely sowing, the original warm-season grass is still in the growth period, the color is not yet yellow, the phytosanitary effect of the cover-sowing lawn is not obvious, and the management cost of the cover-sowing turf will increase accordingly, which is neither scientific nor economical. Late broadcast, low temperature, low rainfall, slow seeding, grass seed germination, long seedling period, and a long time to the Pingping, the original warm season grass has entered a dormant period, the color is yellow, cover turf has not yet become a ping, cover The purpose of the broadcast is affected. In Nanjing, it is generally appropriate to cover the broadcast from mid-October to mid-November. Of course, special years, such as warm winter can be postponed, cold winter should be earlier. In special circumstances, if the best time for planting is delayed, ryegrass can also be planted in colder seasons by covering the film. The covering film is preferably made of 2 filaments or less, which is both practical and economical. Save it after use, and it can be used repeatedly in the coming year. Cover film should pay attention to: ryegrass sprouting after emergence should promptly lift the film. 3, cover broadcast method Unlike the bare soil, the cover-sowing lawn is different from the bare soil. It is added to the original warm-season lawn. The key steps are as follows: (1) Low trim. Before sowing the grass seed, it is necessary to perform a low trimming of the original turf. After trimming, the height of the turf shall be less than 2 cm. (2) Comb the withered layer. Some warm-season turfgrasses, because of their age or lack of conservation, form grass blankets. Not only do they hinder the rooting of grass seedings, but they also impede the absorption of water, air, and nutrients by the soil, seriously affecting the seeded grass species. Germination, emergence, growth. Punches are required for soil-constructed lawns, otherwise the covered turf will not grow well. (3) spread grass species. Spreading should be uniform and artificial sowing can adopt the method of “segmentation quantitatively, crosswisely and crosswisely, and after completion of sowing†so as to sow the plant in the absence of wind or breeze. If it is windy, it must be bent over and spread close to the ground. If sowing is done with a sowing machine, the spread is more uniform, the efficiency is higher, and the effect is better. After the grass seeds are sown, the sand treatment should be carried out. The thickness of the sand coating is generally about 0.3 cm, and it should be uniform. The density of Pandora grass cover is generally 30g/m2. about. (4) Vibration tap. After the grass seeds have been scattered, some of them will be suspended on the stems and leaves of the original lawn, and most of the grass seeds will fall on the soil by vibrating and tapping. (5) Watering. Watering in time after sowing can keep the bed moist on the one hand, and can also shoot down the remaining suspended grass species on the soil. Usually, water is poured every day from sowing to emergence. Watering times can be reduced after emergence. After the landing, follow the general lawn maintenance method. (6) Trim. When the covered ryegrass grows to about 10cm, it can be pruned for the first time to promote seedling tillering and accelerate the rate of landing. Pruning should follow the "l/3" principle, ie cut 1/3 and keep 2/3. Trim successively to the desired stubborn height. The remaining height of the general green space is 2.5-5cm. 4. Management points in the coming spring In the coming spring, the temperature in the spring will increase, and the warm-season grass will shift from dormancy to recovery. In order to promote the degradation and disappearance of the cover-sown turf and promote the return of the original warm-season turf, the following points should be noted: (1) Increase the low trimming frequency. In March, the grass is cut every 7-10 days, and it is trimmed down to 2cm. Because the warm-season grasses are less resistant to pruning and the non-heat-resistant ryegrass are not resistant to low pruning, ryegrass can exit quickly. (2) Minimize watering and no fertilization. Under conditions with good water and fertilizer conditions, ryegrass is not easily degraded, and warm-season grasses must be affected. (3) The use of glyphosate (herbicide) and paclobutrazol (chlormequat) can inhibit the growth of ryegrass and promote its disappearance. In the winter of 2007, a fresh green grass grows on the lawn in front of the Memorial Hall of Yuhuatai Martyrs Memorial Park in Nanjing. This is the annual ryegrass called "Pandora Devil's Grass". The Nanjing Presidential Palace, Dongshuiguan Park, and Jiangning City are all located on the lawn. This lawn grass was planted. Ryegrass and tall fescue grasses are the main green grass of the city's winter turf. However, tall fescue has a higher maintenance cost and is far less worthwhile for ryegrass and Bermudagrass. In addition, proper planting of some ryegrass can make cities more affordable. Greening is more diverse. Natural, No-addition, Fig series products WEIHAI ACCELERATE BIOTECHNOLOGY CO, LTD , https://www.accelerfig.com