Studies On Fly Ash Used As Turf Medium And Turf Fertilizing Environment

As the lawn industry in our country developed fast in recent years, the large-scale lawn production has brought the serious malady that current topsoil has been destructively destroyed by the production of wrapping sward. So, it is demanded to strengthen the research of turf medium. At the same time, from lawn cultivation and maintenance, a comprehensive assessment system of turf quality including landscape quality assessment, utilization quality assessment and environment quality assessment should be proposed with the flourishing of our turf industry.This study mainly reported the feasibility of fly ash used in turf industry, its environmental effects and the assessment of turf quality. Pot experiments was done that fly ash mixed with soil according to different ratios to establish turfgrass to find the best ratios of fly ash and soil in the medium. Then the optimal fertilizing environments were researched and the influences of the turf medium on soil environment and underground water quality were appraised. Finally, a comprehensive assessment system of turf quality was proposed.Soil and fly ash mixed in different ratios (100:0, 70:30, 50:50, 30:70, 0:100) and Lolium multiflorum L.cv, Barmultra was planted in the medium. The results indicated mixing fly ash with soil could enhance soil properties, such as contents of clay particles, available P, total P and part of metal elements, i.e., K, Ca, Mn, Zn, Cu. These effects had great linear relation with the application rates of fly ash. At the same time, with the enhancement of rates of fly ash, the contents of Pb and Cd were increasing linearly. But contents of metallic elements, i.e., Zn, Cu, Pb were below the Grade One of Quality Standards of Soil Environment (QSSE). According to the Grade Three of cadmium element, the usage of fly ash should be controlled below 31.729 per cent Growth and upgrounding yields of turfgrass were best in the treatment of S70F30, so application of fly ash at 30 percent rate should be the optional medium for sod.Based on the fact that the optimal ratio of fly ash and soil as lawn medium has been found, three kinds of contrastive fertilizing environment were designed first, i.e., the fly ash brick-hole environment, the soil-hole environment and the mixed environment of soil and fly ash to analyze the fertilizing and biological effects of fly ash bricks with turf medium in their holes. Perennial ryegrass(Lolium multiflorum L.cv, Barmultra) were planted in the holes and circles of different fertilizing environment. The results showed that turfgrass tissue under brick-holeenvironment had higher contents of nutrient elements such as N, K, Na, Cu, Zn. So, the brick-hole environment could benefit plants greatly. The brick-hole environment had lowest evaporation rate and highest medium water content. In a word, it had long-time water-holding capacity to effectively lift the menace of high temperature on turfgrass, especially the cold-season turfgrass. The clipping yield of turfgrass under soil-hole environment during the whole growing seasons was highest and its quality was the best. Then, compared with the cement brick-hole environment, the fly ash brick had stronger abilities of water supply and heat preservation, which help turfgrass live through the winter safely and reverse earlier. Total yields and upgrounding yields of turfgrass under fly ash brick-hole environment were higher than that under cement brick-hole environment. The fly ash brick-hole environment with with turf medium in their holes was the optimal fertilizing environment.Leaching characteristics and environmental effects of fly ash medium under different rainfall intensity, duration and turf coverage were studied. The results suggested that the contents and losses of leaching elements in the treatments with turf coverage were lower than that without vegetation, which meant vegetation could reduce effectively contents and losses of leaching elements. The influence of rainfall intensity on element contents was notable while that on element losses was less regular. With...