Abstract
In order to verify the feasibility of reclamation and utilization of construction wastes of different particle sizes in landscaping, construction wastes were screened out with 4 grain grades of 0-2mm, 2-3mm, 3-5mm and 0-6mm. According to the compound mass ratio of 10%, 20%, 30%, 40%, 50% and the soil, the effects of different particle size and proportion matrix treatment on soil bulk density and potted rose growth were studied. The results show that the bulk density of substrates decreases with the increase of the particle size and proportion of construction waste. In addition to no significant effect on leaf morphology, adding proper amount of construction waste to the soil had a significant effect on plant height, stem diameter increment, root length, root fresh weight, total flower number, chlorophyll content and nitrogen, phosphorus, potassium content in the plant of potted rose. However, excessive application of construction waste inhibited the growth of potted rose. In the comprehensive analysis, the optimal particle size was 3-5mm, followed by 2-3mm. The optimal proportion is 40%, followed by 30%. It is feasible to add construction waste as a modifier to landscaping matrix.
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