| In order to find suitable media for turf, white button mushroom (Agaricus bisporus) spent mushroom compost (SMC), eringii (Pleurotus eryngii) SMC and agrocybe aegerila (Agrocybe chaxinggu) SMC that were fresh or had been composted for 6 or 12 months were used for Lofty Fescuegrass (Festuca elata Keng) and bluegrass(Poa annud). we analyse the physical and chemical properties of SMC and quality of the grass to select a favorable media for lawn. Then extended it to the field, applied into the field soil with mulching (F) and blending (H) method, evalue the impact on the quality of lawn soil and grass floor. Finally this work can provide theoretical guidance and technical support for the recycling of spent mushroom compost and lawn planting. The main results as follows:(1) The laboratory tests showed that the physical and chemical properties of the different SMCs varied significantly. The bulk density was in the range of 0.15-0.64 g·cm-3 and was within the acceptable range of plants. Most kinds of spent mushroom compost were neutral to slightly alkaline, pH values were between 5.16-9.36. Total porosity were in the range of 53.25%-72.50% and the gas-water ratio were about 1:2-1:8. The nitrogen content of kinds of SMCs had significant differences between 1.20%-2.57%, ratio of carbon and nitrogen were between 12-29. Among the tested SMCs, white button mushroom SMC manifested a higher total porosity and water-holding porosity, a lower ratio of carbon and nitrogen, which was in the range of 12-14, but a higher EC value. The eringii SMC showed a higher aeration porosity but a lower total porosity and water-holding porosity, and a higher ratio of carbon and nitrogen which was reached at about 29 and could not supply stable nutrients. Agrocybe aegerila SMC had a higher total porosity, aeration porosity large, large water-holding porosity, which was suitable for plant growth, but its high pH value reached at 9.36.(2) Different kinds of SMCs had different effects on lawn. Among the tested SMCs, white button mushroom SMC composted for 12 months resulted in the highest scores in terms of lawn appearance quality, above-and belowground biomass and root activity. Agrocybe aegerila SMC composted for 12 months could also be used as lawn media, but its high pH value might be a limiting factor. Therefore the grass biomass was about half of the white button mushroom SMC In contrast, the eringii SMC did not retain water and was not conducive to grass growth, and it might therefore require composting for a longer time to be used. Therefore, when SMC was used as a substrate, full composting was necessary.(3) Spent mushroom (garicus bisporus) compost that had been composted for 12 months could improve rootzone soil and promote the growth of grass. The results showed that the soil of test groups manifested a lower pH value, higher EC value, lower soil bulk density, higher total porosity and water-holding porosity. Both trentments could enhance the nitrogen content of soil significantly, F and H were 9 and 4 times higher than CK. Urease activity was also significantly enhanced, F and H were 2 times higher than CK. Further more, bacterial community diversities were enriched, F treatment was the highest. Correlation analysis showed that there was a significant correlation between bacterial diversity and soil urease, phosphatase activity or physicochemical properties. Above and underground biomass of test groups were higher than control groups, dry weight of H was increased by 49% and 39%. Therefore, we recommended apply spent mushroom compost with the blending method. |
