Effects Of Construction Waste Recycled Materials On The Growth Of Three Garden Plants

With the acceleration of my country’s urbanization process,a large amount of construction waste is produced.The disposal methods of open-air storage and direct landfill have brought a series of ecological environment and economic development problems.How to improve the utilization rate of construction waste has attracted widespread attention.At the same time,defects such as poor soil permeability hinder the development of urban landscaping.For this reason,this article proposes to use construction waste recycled materials as soil amendments,and discusses its effect on soil improvement and its impact on the growth of garden plants.The recycled materials of construction waste were screened out into 4 kinds of particle sizes of 0-2 mm,2-3 mm,3-5 mm and 0-6 mm.The different particle sizes of recycled materials of construction waste were prepared into different treatment substrates according to the compound mass ratio of 10%,20%,30%,40% and50% with soil.With pure soil treatment as a control,pot culture was used to study its effects on the growth of three garden plants,Lolium multiflorum Lamk,Hemerocallis fulva‘Golden Doll’ and Rosa hybrida L..The main findings are as follows:(1)The application of construction waste recycled material can effectively reduce soil bulk density and increase soil porosity.Compared with the control group,the bulk density of each particle size treatment matrix decreased with the increase of the proportion of construction waste,and the maximum decrease was 16.31% lower than the control group.The porosity increased with the increase of the proportion of construction waste,and the peak value increased by 12.42%.(2)It promoted the growth of Lolium multiflorum Lamk,except that it had no significant effect on the emergence rate of Lolium multiflorum Lamk,it also promoted the plant height,tiller number,biomass,chlorophyll,nitrogen,phosphorus and potassium contents of Lolium multiflorum Lamk compared with the control group,and the peak values increased by24.15%,28%,64.72%,58.39%,73.13%,64.4%,85.98% respectively,However,excessive construction waste can inhibit the growth of Lolium multiflorum Lamk,and the best particle size and proportion are 3-5 mm and 30% respectively.(3)In addition to no significant effect on the number of single flower of Hemerocallis fulva ‘Golden Doll’,the contents of leaf number,plant height,root length,biomass,chlorophyll,nitrogen,phosphorus and potassium of Hemerocallis fulva ‘Golden Doll’ were significantly increased compared with the control group,and the peak values increased by89.65%,45.88%,68.06%,112.24%,48.93%,107.49% respectively 95% and 53.95%respectively,but the excessive construction waste inhibited the growth of Hemerocallis fulva,and the best particle size and proportion were 3-5 mm and 30% respectively.(4)Besides no significant effect on the leaf morphology(length and width),the contents of plant height,stem diameter,root length,root weight,total flower number,chlorophyll and nitrogen,phosphorus and potassium in the three nutrient elements of rose were significantly improved compared with the control group,and the peak values were increased by 47.75%,152.87%,116.49%,115.96%,170% respectively 45%,124.92%,91.74% and 74.31%,but excessive construction waste inhibited the growth of rose,and the best particle size and proportion were 3-5 mm and 40% respectively.In general,the application of recycled construction waste can improve soil texture and promote plant growth.It is feasible to use recycled construction waste as a soil conditioner resource for landscaping,and can produce good ecological and economic value.