Effects of Soil Amendments on Growth of Field Rose and Urban Greenspace Soil Properties
[Objective]The present study was done to investigate the effects of different amendments on the growth of roses and their effects on soil improvement of urban greenspaces.[Method]Two-year-old plants of the Rosa chinensis variety'Shenzhen Red'were used as the ex-perimental materials.In situ experiments were conducted with application of organic fertilizer and different soil amendments.The growth and flowering of roses as well as the physicochemical proper-ties of the soil in different treatments were maesured within 0-56 days after treeatment,and the appli-cation effects of different soil amendments were evaluated.[Result]The soil amendment treat-ments had a significant effect on the growth and flowering of roses.Among them,the plant height,stem diameter,crown width,and leaf SPAD value in roses treated with amendment 2(product made of waste soil foam particles:biochar:biochemical fulvic acid:potassium polyacrylate=50:25:5:1)increased by 7.83%,19.88%,13.46%,and 8.05%,respectively,compared to the control at 56 days after treatment.The number of flowers,flower diameter,single flower weight,and flower weight per plant increased by 28.76%,23.40%,22.22%,and 60.74%,respectively,in the treatment with amend-ment 2 compared to the control.The combinations of organic fertilizer and two amendments had a significant improvement effect on the planting soil,among which the treatment of organic fertilizer combined with amendment 2 showed the best.At 56 days,the bulk density of the planting soil treated with amendment 2 decreased by 3.42%compared to the control;the organic matter content was 2.65 times of that in the control;the soil infiltration rate,available N,available P,and available K content increased by 55.89%,46.67%,60.18%,and 37.55%,respectively,compared to the con-trol.[Conclusion]Application of 75 g/m2 inorganic fertilizer+375 g/m2 organic fertilizer+375 g/m2 amendment 2 is suitable for improving the urban greenspace soil properties for rose cultivation.
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