The Study On The Production System Of High Quality Sod Of Tall Fescue

As a pattern of turf establishment, sod is generally accepted by gardening people because it has fast effect and is easy to operate. As sod is a live, seasonal, of sustainable consumption merchandise with great disturbance by market, we can only improve its quality and shorten production cycle as possible to reduce opportunity cost caused by turf residence time and increase output value of per unit area land, strengthening market competition in the end. With Southern Gold tall fescue as the material, effects of different seeding rates, nitrogenous fertilization and trimming height on the production of tall fescue turf were studied. Density, green coverage, tiller number, biomass, the ratio of fresh weight to dry weight in ground root, soil weight of 2.5 cm root system entrainment and comprehensive sod quality were determined. In this study, feasible seeding rate, nitrogenous fertilization and trimming height were obtained, which provide references to tall fescue production in the Yangtze River basin. The main results were as follows:1. Effects of different seeding rate (20,25,30,35,40 g/m2) on Southern Gold tall fescue turf growth and quality were researched. The results showed that 25-30 g/m2 of seeding rate could increase biomass of per unit area land, maintained good green coverage and comprehensive quality, with suitable density and tiller number. Under the seeding rate, sod could be transplanted in April, and it also had hale root. As entrained less soil, it induced little destroy to surrounding environment.2. Effects of different N fertilization (0,2.5,5,7.5 g N/m2) on Southern Gold tall fescue turf growth and quality were investigated. We obtained that 5 g N/m2 was the best from the results. The more N fertilization was, the higher lever sod green coverage, comprehensive quality, tiller number and biomass maintained in.5 g N/m2 treatment had the most root biomass of per unit area land and the ratio ofD-5 cm root biomass to 0-25cm.2.5 cm turf entrained the least soil, which less damaged the soil environment, with better economic benefits. Under the N fertilization of 5 g/m2, tiller number, biomass of per unit area land, green coverage and comprehensive quality maintained on a higher lever. 3. The influence of trimming height on vegetation coverage, tiller numbers, biomass and turf quality were discussed in this paper. We conclude that the optimum mowing height ranged form 5 to 7cm. At such height, the vegetative coverage, tiller numbers, the biomass accumulation, the amount of roots distributing in 0 to 5cm surface layer soil were high, as well the turf quality was better.4. Under 25g/m2 of seeding rate,5 g/m2 of N fertilization and 7-9cm of trimming height, the ratio of 0-5cm turf root biomass to total root biomass (0-25cm) was biggest,2.5cm sod entrained less soil, which less damaged the soil environment, with better economical and ecological benefits.5. All the results showed that the turf growth condition was good in April with each indexes maintaining on higher level. Root biomass and the ratio of 0-5cm root biomass to 0-25 total root biomass started to descend in May, with soil weight entrained by 2.5cm turf increasing, resulting in the decline of turf quality. Sod should not be harvested later than April.